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Review

Simulation in the Built Environment: A Bibliometric Analysis

School of Architecture, University of Nevada, Las Vegas, NV 89154, USA
Metrics 2025, 2(3), 13; https://doi.org/10.3390/metrics2030013
Submission received: 4 June 2025 / Revised: 18 July 2025 / Accepted: 30 July 2025 / Published: 4 August 2025

Abstract

Simulation has become a pivotal tool in the design, analysis, and optimization of the built environment, and has been widely adopted by professionals in architecture, engineering, and urban planning. These techniques enable stakeholders to test hypotheses, evaluate design alternatives, and predict performance outcomes prior to construction. Applications span energy consumption, airflow, thermal comfort, lighting, structural behavior, and human interactions within buildings and urban contexts. This study maps the scientific landscape of simulation research in the built environment through a bibliometric analysis of 12,220 publications indexed in Scopus. Using VOSviewer 1.6.20, it conducted citation and keyword co-occurrence analyses to identify key research themes, leading countries and journals, and central publications in the field. The analysis revealed seven primary thematic clusters: (1) human-focused simulation, (2) building-scale energy performance simulation, (3) urban-scale energy performance simulation, (4) sustainable design and simulation, (5) indoor environmental quality simulation, (6) building aerodynamics simulation, and (7) computing in building simulation. By synthesizing these trends and domains, this study provides an overview of the field, facilitating greater accessibility to the simulation literature and informing future interdisciplinary research and practice in the built environment.

1. Introduction

Simulation plays a pivotal and increasingly vital role in the design, analysis, and optimization of the built environment. A range of simulation techniques enables professionals in architecture, engineering, and urban planning to test hypotheses, explore design alternatives, and evaluate performance outcomes under various conditions—before any physical construction occurs. Applications span energy consumption [1], airflow [2], thermal comfort [3], lighting [4], structural behavior [5], and human interactions within buildings [6] and urban contexts [7].
The two main categories of simulation methodologies are (1) experimental simulation, which involves physical experimental setups, and (2) numerical simulation, which relies on mathematical models and numerical methods, typically executed via computer software [8]. Examples of experimental simulation include wind tunnel testing and full-scale mock-ups (e.g., [9]). Numerical simulation encompasses techniques such as agent-based modeling, finite element analysis, and computational fluid dynamics (CFD) (e.g., [10]). Numerical simulations are often favored for their flexibility and lower cost per iteration, as they allow for scenario modifications without the physical constraints and resource demands of experimental setups [11]. Nevertheless, experimental simulation remains critical where it serves to validate or calibrate numerical results through empirical testing [12].
The rise in computer-based simulations has been accelerated by advancements in hardware (e.g., GPUs) and software platforms, such as building information modeling (BIM) and digital twins, along with the increasing accessibility of these technologies. These developments have made it possible to simulate complex phenomena. A prime example is building energy performance simulation, which involves modeling a complex interplay of building characteristics, integrated systems (e.g., HVAC and lighting), external weather conditions, and occupant behavior (e.g., [13]).
The benefits of simulation in the built environment are multifaceted. These include the following: (1) supporting more informed decision-making during the design process and reducing costly design errors; (2) optimizing building performance; (3) minimizing risks associated with extreme conditions such as fires, earthquakes, or severe weather; and (4) facilitating scenario testing in dynamic and complex systems. Despite these advantages, simulation methods face several limitations. First, they rely on assumptions that may not fully capture real-world variability, potentially leading to inaccuracies. Second, simulations demand high-quality input data and reliable modeling techniques. Third, detailed simulations can be computationally or physically intensive, posing challenges for iterative design and broad adoption. Finally, ensuring that simulation results correspond to real-world performance—particularly over long-term or system-level studies—remains a persistent challenge.
Considering the breadth and complexity of simulation-related topics in the built environment, mapping the scientific literature can provide valuable insights. A comprehensive overview can support interdisciplinary collaboration by identifying key research themes, uncovering knowledge gaps, and highlighting emerging trends that bridge disciplinary boundaries and foster innovative approaches to complex challenges.
Various literature reviews have previously contributed to understanding simulation’s role in specific domains of the built environment, effectively offering partial scientific mappings of their respective areas (e.g., [14,15,16]). For instance, Harish and Kumar [16] reviewed simulation methods used in modeling building energy systems, while Fumo [17] offered an overview of building energy simulation fundamentals. Although these narrative reviews provide in-depth analysis and critical reflection on specific topics, they often suffer from limitations such as narrow scope and small sample sizes (typically 20 to 200 studies) [18,19].
In contrast, bibliometric analysis offers a quantitative and systematic alternative that addresses many of these limitations. By leveraging computational tools and bibliographic databases, bibliometric methods can analyze large datasets efficiently and objectively. Rather than relying on subjective interpretation, these methods use indicators such as citation counts, h-index values, journal impact factors, and co-authorship networks to assess scholarly influence and connectivity. The increasing application of bibliometric techniques across disciplines (e.g., [19,20,21]) has been facilitated by access to metadata from databases such as Scopus, along with visualization tools like VOSviewer and Gephi [18].
The two main types of bibliometric analysis are performance analysis and science mapping. Performance analysis assesses the output and impact of research at the levels of individuals, institutions, journals, or countries. Science mapping, on the other hand, visualizes the intellectual structure and development of a research field.
Several bibliometric studies have explored building-related topics, including structural simulation [22], human-building interaction [23], and energy efficiency [24,25]. However, as simulation becomes increasingly embedded across disciplines, the literature remains fragmented. A comprehensive bibliometric analysis is needed to integrate these perspectives and reveal how simulation supports decision-making during the design process across the built environment. This gap motivates the current study.
Accordingly, this research aims to provide a detailed bibliometric map of the scientific landscape surrounding simulation in the built environment. The study is guided by the following research questions:
  • What are the leading countries and journals in the field of simulation in the built environment?
  • What are the central publications in the citation network of this research area?
  • What are the most frequently occurring keywords, and how are they interconnected?
  • What are the major themes in the literature on simulation in the built environment?
This paper offers a unique and comprehensive mapping of simulation research in the built environment that surpasses previous reviews in both scope and analytical depth. While earlier works have addressed specific subdomains, such as energy modeling or occupant behavior, this research is the first to apply a large-scale bibliometric analysis—covering over 12,000 publications—to synthesize trends across the entire interdisciplinary landscape. The originality of this study lies in its data-driven methodology and its ability to reveal the field’s intellectual structure, identify emerging themes, and highlight research gaps. In this way, it enhances the state of the art by offering a strategic overview that can guide future research, inform policy, and support practitioners in making more informed decisions about simulation tools and applications. This study is particularly valuable for researchers seeking to position their work within the broader context, for educators designing simulation curricula, and for professionals aiming to integrate simulation into design and planning workflows more effectively.

2. Methods

2.1. Identifying Pertinent Publications

This paper adopts the method of Jamshidi et al. [19], with some modifications. The Scopus database was used to conduct a literature search in order to find publications that were pertinent to simulation in the context of the built environment. The keyword simulation was paired with various building-related terms (i.e., building, built environment, physical environment, interior design, and architecture) to search in the author-provided-keywords field. The search was executed using the following query: AUTHKEY (simulation) AND AUTHKEY (building OR “built environment” OR “physical environment” OR “interior design” OR architecture). No restrictions were applied to this search in terms of publication date, geographic location, language, or document type.
Conducted in April 2025, the search returned a total of 12,220 records dated from 1972 to 2025. Not all of these were directly relevant to simulation in the context of built environments. To enhance the efficiency of the review process, manual screening of records for relevance was not performed. Instead, VOSviewer version 1.6.20 [26], was used to identify relevant publications and exclude outliers. This method allowed for a more streamlined analysis by minimizing the need for time-consuming manual evaluation.
Five analytic techniques are available in VOSviewer version 1.6.20 [26] for assessing an item’s relatability, including keywords, countries, and publications. These techniques include: (1) bibliographic coupling, (2) citation analysis, (3) co-citation analysis, (4) co-authorship analysis, and (5) co-occurrence analysis. For a comprehensive explanation and practical examples of these bibliometric methods, refer to Donthu et al. [18]. In this paper, citation analysis and co-occurrence analysis were selected as the primary methods, as detailed in the subsequent section.

2.2. Data Analysis

To identify the most prominent countries and journals in the domain, two primary metrics were utilized: (1) total number of publications (TP), representing research output, and (2) total citations (TC), reflecting scholarly influence. These metrics served as the basis for generating rankings that highlight both productivity and impact across geographic and publication sources.
To identify key publications in the domain of simulation within built environments, citation analysis was used. This method evaluates the degree of relatedness between documents by examining how frequently they cite one another—a metric referred to as the link count. Higher link counts indicate that publications are more central within the citation network. This approach also facilitated the exclusion of outliers, as irrelevant documents typically lacked citation links to core publications in the field. Based on this analysis, the 40 most influential publications were identified and ranked according to their centrality in the citation network.
The keyword analysis encompassed five components: (1) identifying the most commonly used keywords, (2) creating visual network maps of keyword relationships, (3) detecting clusters of related keywords, and (4) identifying the most frequently occurring keywords in each cluster. Prior to performing these analyses, a thesaurus was developed to standardize variations in terminology, ensuring consistency across different spellings, singular/plural forms, and conceptually similar terms (e.g., “finite element method” and “finite element simulation”).
To generate a visual network of keyword relationships, a co-occurrence analysis was conducted using VOSviewer version 1.6.20 [26]. This analysis focused on author-provided keywords from the selected publications. In the resulting network graph, nodes represent individual keywords, with node size corresponding to the frequency of occurrence. Connections (or links) between nodes indicate that the paired keywords appeared together in the same publication. For clarity, the visualization can be filtered to display only the strongest connections, meaning the absence of a visible link does not necessarily imply a lack of association. VOSviewer version 1.6.20 [26] assigns keywords to clusters with different colors to aid in the interpretation of thematic groupings within the network.
Finally, to support the qualitative interpretation of each cluster, the most frequently occurring keywords within each group were identified and ranked. By combining insights from the keyword network visualization with these rankings, thematic labels were assigned to each cluster, enabling a clearer understanding of the dominant topics represented in the literature.

3. Results

3.1. Top 20 Countries

Table 1 presents the 20 most active countries in the field, ranked according to two key metrics, total number of publications (TPs) and total citations (TCs), which reflect research productivity and impact, respectively. China leads in terms of publication volume, followed by the United States, Italy, and the United Kingdom. When considering research impact, the United States ranks highest, with China, Italy, and the United Kingdom following in that order.

3.2. Top 10 Journals

Table 2 highlights the top 10 journals contributing to the field of simulation in built environment research, ranked by total publications (TP) and total citations (TC), which reflect output and scholarly influence. The most prolific journals were Energy and Buildings, Building and Environment, and Energies. With respect to research impact, Energy and Buildings again ranked first, followed by Building and Environment and Applied Energy.

3.3. Central Publications

Citation analysis was employed to assess the degree of relatedness between papers by examining the frequency of mutual citations. Following this, the papers were ranked according to their connectivity within the citation network. The 40 most interconnected papers are presented in Table 3.
Table 1. The 20 leading countries ranked by productivity (TP) and research impact (TC).
Table 1. The 20 leading countries ranked by productivity (TP) and research impact (TC).
RankProductivityImpact
CountryTPCountryTC
1China2966USA62,115
2USA1951China35,354
3Italy1031Italy30,178
4United Kingdom820United Kingdom21,781
5Germany708Canada16,042
6France543Germany13,714
7Canada532Hong Kong11,525
8Spain445France11,350
9South Korea347Netherlands11,112
10Australia346Australia9469
11Japan342Spain8612
12India305Belgium8553
13Hong Kong297Switzerland8322
14Netherlands264Portugal6178
15Brazil253South Korea5986
16Portugal216Sweden5915
17Belgium202Japan5811
18Sweden200Brazil5054
19Switzerland197Denmark3755
20Iran181Iran3332
Note. TP = total publications; TC = total citations.
Table 2. The 10 leading journals on the topic of simulation in the context of built environments based on productivity (TP) and research impact (TC).
Table 2. The 10 leading journals on the topic of simulation in the context of built environments based on productivity (TP) and research impact (TC).
RankProductivityImpact
Journal TitleTPJournal TitleTC
1Energy and Buildings875Energy and Buildings50,241
2Building and Environment385Building and Environment21,492
3Energies262Applied Energy14,864
4Applied Energy226Automation in Construction5717
5Journal of Building Engineering219Renewable and Sustainable Energy Reviews5545
6Buildings205Journal of Building Engineering4561
7Sustainability192Journal of Building Performance Simulation4405
8Energy Procedia190Energy4347
9Building Simulation155Energies4097
10Journal of Building Performance Simulation147Building Simulation3877
Note. TP = total publications; TC = total citations.
Table 3. The 40 most central publications in the citation network related to simulation research within the context of the built environment.
Table 3. The 40 most central publications in the citation network related to simulation research within the context of the built environment.
RankRef.Publication Main TitleLCTC
1[14] *Occupant behavior modeling for building performance simulation132743
2[27]User behavior in whole building simulation87522
3[28]Interactions with window openings by office occupants85422
4[16] *A review on modeling and simulation of building energy systems80561
5[29]Co-simulation of building energy and control systems with the building controls virtual test bed78364
6[30] *Advances in research and applications of energy-related occupant behavior in buildings73452
7[31]Building model calibration using energy and environmental data67221
8[15] *Assessing gaps and needs for integrating building performance optimization tools in net zero energy buildings design65358
9[32] Building simulation65170
10[33]Results from field surveys to predict the effect of open windows on thermal comfort and energy use in buildings63488
11[34] *Methodologies and advancements in the calibration of building energy models59189
12[35]Simulation-based decision support tool for early stages of zero-energy building design58361
13[13] *An ontology to represent energy-related occupant behavior in buildings58271
14[36]Analysis of uncertainty in building design evaluations and its implications57270
15[37]A new methodology for investigating the cost-optimality of energy retrofitting a building category56165
16[38]Calibrating whole building energy models: An evidence-based methodology55237
17[39]Modelica buildings library53529
18[40] Integrated building performance simulation53150
19[41]A novel approach for building occupancy simulation52256
20[42]On approaches to couple energy simulation and computational fluid dynamics programs52247
21[43]An occupant behavior modeling tool for co-simulation52157
22[44]Window opening behaviour modelled from measurements in Danish dwellings51271
23[45]Impacts of future weather data typology on building energy performance51239
24[46]On the behaviour and adaptation of office occupants50334
25[47]Energy retrofit of historical buildings48180
26[48] Ten questions concerning occupant behavior in buildings47446
27[49] *The impact of occupants’ behaviours on building energy analysis47437
28[50]The influence of building height variability on pollutant dispersion and pedestrian ventilation in idealized high-rise urban areas46368
29[51]Calibrating whole building energy models: Detailed case study using hourly measured data46172
30[52]Simulation of occupancy in buildings45211
31[53] *A review of current and future weather data for building simulation45168
32[54]Verification and validation of EnergyPlus phase change material model for opaque wall assemblies44340
33[55]Numerical evaluation of wind effects on a tall steel building by CFD44252
34[17] *A review on the basics of building energy estimation43356
35[56] *Pedestrian-level wind conditions around buildings43352
36[57]Model calibration for building energy efficiency simulation43165
37[58]Innovative technologies for NZEBs4383
38[59] *Advances in building simulation and computational techniques42144
39[60] *Review of passive PCM latent heat thermal energy storage systems towards buildings’ energy efficiency40876
40[61]A green roof model for building energy simulation programs40591
Note. * Literature review; position paper; Ref. = reference; LC = links count; TC = total citations.
Twelve of the publications listed in Table 3 are literature reviews that explore a variety of themes within the domain of building simulation. These themes include simulation tools and methodologies for assessing building performance [15,59], patterns of occupant behavior in indoor environments [13,14,30,49,52], energy modeling and validation techniques [16,17,34,53], applications of phase change materials [60], and building aerodynamics [56]. These reviews offer valuable entry points for readers seeking deeper insights into specific subfields.
Some of these literature reviews address multiple topics, reflecting the interconnected nature of the subjects. For example, the top-ranked review by Yan et al. [14], published in Energy and Buildings—a journal that leads in both publication volume and citation impact on the topic of simulation in the context of built environments (see Table 2)—focused on the significance of modeling occupant behavior in building performance simulations. It provided a comprehensive overview of the current research landscape, addressing key challenges such as data acquisition, model formulation, validation, and integration with existing simulation platforms.

3.4. Keyword Analysis

This section offers two complementary keyword analyses: (1) an examination of the most commonly used author-provided keywords, and (2) a network-based analysis that reveals clusters of related terms based on their co-occurrence patterns.

3.4.1. Most Frequently Occurring Author-Provided Keywords

Using VOSviewer 1.6.20 [26], a co-occurrence analysis was conducted to evaluate the relatedness of author-provided keywords, based on how often they appeared together across documents. Through several iterations, a minimum occurrence threshold of 20 was chosen, yielding a clear set of keyword clusters and a manageable dataset. This analysis identified the 50 most frequently co-occurring keywords, as shown in Table 4.
A qualitative analysis of these 50 keywords reveals that they generally fall into five overarching roles in building simulation: (1) simulation objectives (e.g., risk assessment, wind load, and energy analysis), (2) simulation techniques (e.g., CFD, large-eddy simulation, and agent-based modeling), (3) enabling technologies (e.g., BIM, virtual reality, and digital twin), (4) climatic and environmental context (e.g., weather information), and (5) simulated features (e.g., building envelope, passive design strategies, and phase change materials). Table 5 provides a detailed breakdown of these keyword categories based on these five roles.

3.4.2. Keyword Networks and Thematic Clustering

Figure 1 displays the keyword network, where each thematic cluster is visually represented using a distinct color. To enhance visual interpretability, the network highlights only the 300 most significant connections. For further qualitative exploration, the 10 most frequently used keywords in each cluster were extracted (Table 6), and an additional classification based on their roles in building simulation was conducted (Table 7). The following subsections provide detailed insights into the nature and implications of each identified cluster.
Cluster 1: Human-Focused Simulation. The first cluster (shown in red in Figure 1) focused on simulations within built environments that involve direct human engagement. It included keywords focused on behavior-related scenarios—such as evacuation and crowd simulation—as well as cognitive-oriented applications like education and visualization. This cluster also highlighted terms related to emergencies and public safety, including fire, COVID-19, and risk assessment. Among the keywords related to the enabling technologies role in building simulation were BIM, virtual reality, digital twins, and GIS.
Table 4. The 50 most frequently occurring author-provided keywords.
Table 4. The 50 most frequently occurring author-provided keywords.
RankKeywordOccurrencesTotal Link Strength
1Simulation24473168
2Building simulation11031583
3Numerical simulation860673
4Building energy simulation8401030
5Energy5481013
6Building performance simulation502730
7Computational Fluid Dynamics (CFD)484757
8Energy efficiency4821052
9High level architecture462462
10Building431901
11Computer simulation415457
12Architecture414560
13Thermal comfort412961
14Modeling372570
15Building Information Modeling (BIM)364510
16Residential building301590
17Dynamic simulation257416
18Energy consumption231453
19High-rise building228279
20Performance213296
21EnergyPlus211482
22Monte Carlo simulation205168
23Distributed simulation200272
24Large-eddy simulation191214
25Building envelope186360
26Climate change184379
27Office building171356
28Energy saving165331
29Natural ventilation154336
30Optimization151350
31Occupant behavior151340
32Historic building142271
33Energy performance140294
34Co-simulation139191
35Daylight133236
36Sensitivity analysis129286
37Machine learning126247
38Evacuation112129
39Green building109224
40Software architecture108106
41Tall building103135
42TRNSYS simulation102199
43Thermal performance100217
44Sustainability96260
45Agent-based simulation96113
46Virtual reality93130
47Building performance90200
48Multi-objective optimization89192
49Uncertainty analysis89184
50Phase change material89179
Table 5. Categorization of keywords by role in building simulation.
Table 5. Categorization of keywords by role in building simulation.
CategoryKeywords
Simulation ObjectivesClimate change, cooling, education, energy conservation, energy performance, evacuation, global warming, indoor air quality, life cycle assessment, monitoring, natural ventilation, NZEB, performance, pollutant dispersion, risk assessment, sustainability, thermal comfort, turbulence, urban heat island, urban microclimate, ventilation, visual comfort, visualization, wind load
Simulation TechniquesAgent-based sim., artificial intelligence, building thermal sim., CFD, circuit sim., computational modeling, computational sim., construction sim., co-simulation, deep learning, discrete-event sim., distributed interactive sim., distributed sim., dynamic building, sim., dynamic energy sim., dynamic sim., dynamic thermal sim., economic analysis, finite element sim., genetic algorithm, hybrid sim., hygrothermal sim., large-eddy sim., machine learning, model predictive control, Monte Carlo sim., multi-agent sim., multi-objective optimization, network sim., neural networks, numerical sim., parametric analysis, real-time sim., sensitivity analysis, thermal sim., uncertainty analysis, virtual sim., wind tunnel test
Enabling TechnologiesBIM, virtual reality, digital twin, Modelica, GIS, EnergyPlus, TRNSYS, high performance computing, GPU, building automation
Climatic and Environmental ContextWeather data, temperature, solar radiation, typical meteorological year
Simulated FeaturesBuilding aerodynamics, building energy, building energy consumption,
building envelope, building materials, building renovation, built environment,
COVID-19, crowd simulation, daylight, demand response, energy storage, energy use, fire,
green building, green roof, heat pump, high-rise building, HVAC, interior design, lighting,
low-rise building, passive design, phase change material, photovoltaic, renewable energy, retrofitting, solar energy, super high-rise building, thermal energy storage, thermal insulation, thermal mass
Note. Sim. = simulation; NZEB = nearly zero-energy buildings; HVAC = heating, ventilation, and air conditioning; CFD = computational fluid dynamics.
Cluster 2: Building-Scale Energy Performance Simulation. The second cluster (shown in green in Figure 1) focused on energy performance primarily at the building scale. The key terms in this cluster included NZEB, passive design, natural ventilation, energy storage, thermal mass, thermal insulation, phase change material (PCM), and heat pump.
Cluster 3: Urban-Scale Energy Performance Simulation. The third cluster (shown in blue in Figure 1) was closely related to Cluster 2, as both addressed issues of energy performance. This connection was visually represented in Figure 1, where the two clusters appeared adjacent. However, Cluster 3 distinguished itself by incorporating a broader climatic and environmental perspective. The key terms in this cluster included climate change, global warming, urban heat island, urban microclimate, weather data, solar radiation, and climate.
Cluster 4: Sustainable Design and Simulation. The fourth cluster (shown in yellow in Figure 1) was closely related to Clusters 2 and 3, a relationship also visually reflected by their adjacency in Figure 1. However, Cluster 4 specifically emphasized strategies aimed at enhancing building sustainability. Its associated keywords included life cycle assessment, green building, renewable energy, solar energy, green roof, and photovoltaic, indicating a strong focus on sustainable design practices and technologies.
Cluster 5: Indoor Environmental Quality Simulation. The fifth cluster (shown in purple in Figure 1) included keywords related to factors influencing indoor environmental quality. The key terms in this cluster included indoor air quality, cooling, ventilation, HVAC, visual comfort, daylight, and lighting, indicating a focus on the physical and perceptual conditions that affect occupant comfort within buildings.
Cluster 6: Building Aerodynamics Simulation. The sixth cluster (shown in cyan in Figure 1) focused on the simulation of building aerodynamics using computational methods and wind tunnel testing. Two major themes emerged from this cluster: (1) wind loads on high-rise buildings and (2) pollutant dispersion in the environment. The key terms in this cluster included CFD, high-rise building, building aerodynamics, turbulence, and wind tunnel test, highlighting its emphasis on airflow analysis and environmental impact at the building scale.
Cluster 7: Computing in Building Simulation. The seventh cluster (shown in orange in Figure 1) focused primarily on the computational tools and infrastructures supporting building simulation. The key terms in this cluster included machine learning, artificial intelligence, deep learning, computational modeling, neural networks, high performance computing, and GPU, reflecting the growing integration of advanced computing technologies in simulation workflows.
Table 6. The 10 most frequently occurring author-provided keywords in each cluster.
Table 6. The 10 most frequently occurring author-provided keywords in each cluster.
RankKeywords
Cluster 1Cluster 2Cluster 3
1Sim.Building sim.Building energy sim.
2High level architectureBuilding performance sim.Climate change
3ArchitectureEnergy efficiencyOccupant behavior
4ModelingThermal comfortBuilding performance
5BIMDynamic sim.Building design
6Distributed sim.Energy consumptionBuilding energy consumption
7Co-sim.EnergyPlusThermal sim.
8EvacuationBuilding envelopeHeat transfer
9Software architectureOffice buildingUrban heat island
10Agent-based sim.Energy savingOverheating
Cluster 4Cluster 5Cluster 6
1EnergyBuildingNumerical sim.
2Monte Carlo sim.Residential buildingCFD
3Green buildingOptimizationHigh-rise building
4SustainabilityDaylightLarge-eddy sim.
5Multi-objective optimizationHVACTall building
6Uncertainty analysisEnergy conservationFinite element sim.
7Genetic algorithmIndoor air qualityWind pressure
8Renewable energyVentilationLow-rise building
9Solar energyCoolingWind tunnel test
10Life cycle assessmentAir conditioningWind load
Cluster 7
1Computer sim.
2Performance
3Machine learning
4Building energy
5Artificial neural networks
6Artificial intelligence
7Deep learning
8Computational modeling
9Parallel architectures
10Evaluation
Note. Sim. = simulation; CFD = computational fluid dynamics; BIM = building information modeling; HVAC = heating, ventilation, and air conditioning.

4. Discussion

This paper provides a comprehensive bibliometric overview of the scholarly landscape concerning simulation within the context of the built environment. It highlights the most influential countries, journals, and publications, and uncovers key thematic areas within the field.
Through network analysis, seven distinct thematic clusters emerged, each defined by frequently associated keywords and their interrelations. These clusters were categorized as follows: (1) human-focused simulation, (2) building-scale energy performance simulation, (3) urban-scale energy performance simulation, (4) sustainable design and simulation, (5) indoor environmental quality simulation, (6) building aerodynamics simulation, and (7) computing in building simulation. Examples of studies representing each cluster are discussed in the following paragraphs.
Table 7. Categorization of keywords in each cluster by role in building simulation.
Table 7. Categorization of keywords in each cluster by role in building simulation.
Cluster #Simulation ObjectivesSimulation TechniquesSimulated Features
1Evacuation
Visualization
Education
Risk assessment
Distributed sim.
Agent-based sim.
Co-simulation
Discrete-event sim.
Distributed interactive sim.
Network sim.
Hybrid sim.
Multi-agent sim.
Real-time sim.
Virtual sim.
Built environment
Fire
COVID-19
Crowd simulation
2Thermal comfort
Natural ventilation
Energy performance
Monitoring
NZEB
Dynamic sim.
Sensitivity analysis
Parametric analysis
Building thermal sim.
Dynamic building sim.
Dynamic thermal sim.
Economic analysis
Building envelope
Passive design
Phase change material
Retrofitting
Thermal insulation
Heat pump
Thermal mass
Energy storage
3Climate change
Urban heat island
Urban microclimate
Global warming
Thermal sim.
Hygrothermal sim.
Computational sim.
Building energy consumption
Energy use
Building materials
4Sustainability
Life cycle assessment
Multi-objective optimization
Uncertainty analysis
Monte Carlo sim.
Genetic algorithm
Dynamic energy sim.
Green building
Renewable energy
Solar energy
Green roof
Photovoltaic
Building renovation
5Energy conservation
Indoor air quality
Visual comfort
Cooling
Ventilation
Model predictive controlDaylight
HVAC
Demand response
Thermal energy storage
Lighting
6Wind load
Turbulence
Pollutant dispersion
CFD
Numerical sim.
Large-eddy sim.
Wind tunnel test
Finite element sim.
Construction sim.
High-rise building
Low-rise building
Super high-rise building
Building aerodynamics
Interior design
7PerformanceMachine learning
Artificial intelligence
Deep learning
Computational modeling
Neural networks
Circuit sim.
Building energy
Note. TSL = total link strength; sim. = simulation; NZEB = nearly zero-energy buildings; HVAC = heating, ventilation, and air conditioning; CFD = computational fluid dynamics.
Cluster 1 focused on simulations within built environments that involve direct human engagement. For example, Wang et al. [62] simulated fire smoke diffusion and personnel evacuation (i.e., human behavior) in a high-rise medical building with the aim of improving the fire safety performance of the building in emergency situations. Another example is the work of Possik et al. [63], who used agent-based modeling and discrete event simulation methods to simulate the operations (i.e., behaviors) within an intensive care unit (ICU), and used virtual reality to visualize the ICU’s physical environment to run various scenarios for training purposes (i.e., cognitive). Their aim was to enhance hospital operations, management, and training, particularly in response to the challenges posed by the COVID-19 pandemic. Another example of simulation for training purposes is the work of Gunasagaran et al. [64], who used virtual reality to simulate various conditions of daylighting and examined how architecture students perceive the usefulness of this visualization method in their architectural education.
Cluster 2 focused on energy performance primarily at the building scale. For example, Tang et al. [65] simulated heating and cooling loads in multiple buildings to assess the impact of wall insulation thickness and window glazing layers on thermal performance. Zuo et al. [66] investigated the use of phase change materials by comparing the thermal performance of building envelopes constructed with these materials to those built using conventional methods, using EnergyPlus for simulation.
Cluster 3 focused on energy performance on an urban scale. For example, Shi et al. [67] developed a framework to evaluate building thermal resilience at the urban scale during compound events such as heat waves and power outages. Their approach addresses the limitations of prior studies that focused only on individual buildings or overlooked urban microclimates. Their analysis revealed that excluding microclimate factors can result in a 13% overestimation of a building’s thermal resilience. Similarly, Kim and Kim [68] used solar radiation simulations to assess the solar accessibility of individual blocks within urban development plans.
Cluster 4 focused on strategies to improve building sustainability. For instance, Fan et al. [69] performed a life cycle assessment of several university buildings in China to quantify their carbon emissions and identify reduction strategies. Similarly, Gao et al. [70] combined Building Information Modeling (BIM) with life cycle assessment to compare the carbon emissions of prefabricated buildings with those of traditional cast-in situ structures. In another study, Jung et al. [71] used energy simulations to determine the most cost-effective type and installation timing of building-integrated photovoltaic window systems, aiming to maximize their economic viability.
Cluster 5 focused on factors influencing indoor environmental quality. For example, Herrera et al. [53] employed multiple simulation tools alongside a CFD model to evaluate the air quality of an apartment under different ventilation strategies. Similarly, Conceição et al. [72] applied simulation methods to analyze indoor air quality and thermal comfort across various building scenarios, incorporating passive design strategies like shading and geothermal systems. In another study, Uriarte et al. [73] simulated daylighting conditions in a virtual restaurant using three different shading systems to determine the optimal daylight glare index.
Cluster 6 focused on building aerodynamics. For instance, Zhang et al. [74] used large-eddy simulations to study how vertical strips on tall buildings influence aerodynamic forces acting on the structure. In another study, Liu et al. [75] analyzed the impact of two different building layouts along streets on pollutant dispersion, using CFD simulations validated through wind tunnel experiments.
Lastly, Cluster 7 centered on the computational tools and infrastructures that support building simulation. The studies in this cluster explored various simulation methods and enabling technologies, including machine learning [76], artificial intelligence (AI) [77], and neural networks [78]. For instance, Sarfarazi et al. [79], in a review paper, discussed how AI and machine learning are being integrated with simulation models for structural assessment, aiming to enhance predictive accuracy and optimize performance.
The landscape of built-environment simulation has rapidly shifted towards data-driven, AI-enabled paradigms [80]. AI-powered generative design tools generate optimal building configurations by iteratively testing alternatives against defined criteria, delivering more efficient and sustainable solutions than conventional methods [81]. Digital twins (i.e., virtual replicas of buildings, infrastructure or entire cities) have become central to this shift [82]. These twins continuously ingest real-time data from on-site sensors, satellite imagery, layering inputs from vehicles, building systems and external environment with artificial intelligence to simulate and monitor performance [83,84].
The evolving field of built-environment simulation is inherently interdisciplinary, integrating knowledge from architecture, engineering, data science, urban planning, and environmental studies. This interdisciplinary nature is exemplified by emerging tools that combine BIM with the Internet of Things and AI, enabling the transformation of static design models into dynamic digital twins that span design, construction, and operational phases.
Looking forward, simulation is expected to become a strategic tool for decision-making. Beyond traditional applications focused on predicting engineering performance, future simulators will facilitate multi-criteria policy analysis and support comprehensive long-term planning.

5. Limitations

This study faces four primary limitations. First, it draws exclusively from the Scopus database. Although Scopus is extensive, it may not capture every pertinent publication, meaning some relevant works might have been excluded. Nonetheless, given the inclusion of 12,220 records—and considering that most high-quality publications from other sources are also indexed in Scopus—the study likely offers a representative overview of the key topics.
Second, there is a chance that some non-relevant publications were inadvertently included. This issue is partially addressed through the use of co-occurrence analysis, which gauges study relevance based on the frequency with which keywords appear together in a single document. Since keywords unrelated to the built environment simulation field are unlikely to co-occur with relevant ones, this method helps limit the inclusion of outliers.
Third, bibliometric techniques cannot establish the directionality of relationships or infer causality between nodes. As such, this approach should be regarded as a supplement to more traditional forms of literature review [18].
Finally, although keyword clustering is based on quantitative methods, interpreting these clusters is a qualitative process and thus open to some subjectivity. To help address this, the 10 most frequent keywords in each cluster are provided, allowing readers to form their own interpretations.

6. Conclusions

This study presents a comprehensive bibliometric analysis of simulation research in the built environment, encompassing 12,220 publications indexed in Scopus from 1972 to 2025. The seven identified clusters highlight the field’s multidimensional nature, which spans technical, environmental, and human-centric concerns. Notably, the increasing integration of digital technologies—such as BIM, digital twins, and machine learning—demonstrates a clear shift toward more data-driven and intelligent simulation environments.
Despite recent advances, several critical research gaps persist. First, even with the growing use of computational tools and data-driven methods, there remains a consistent discrepancy between simulated and actual building performance. This gap often stems from overly simplified models [34] that fail to capture complex, real-world factors—such as human behavior within built environments [49,85].
Second, there is a shortage of high-quality field data needed to accurately represent occupant behavior, material properties, and unpredictable environmental influences (e.g., [59]). Variability in occupancy patterns, construction quality, and weather conditions introduces significant uncertainty into model predictions (e.g., [85,86]), posing a major challenge for AI models that rely on robust, high-quality datasets for effective training [79].
Third, a disconnect remains between research and real-world application. This is largely due to factors such as the need for specialized expertise, long computation times, and the lack of integration between simulation and optimization workflows [15].
Fourth, the absence of standardized practices for data collection, modeling, and simulation continues to limit the broader adoption and effective implementation of building simulations [13].
Finally, as AI becomes increasingly embedded in engineering workflows, there is a growing need to prepare future professionals to critically interpret AI-generated results within the framework of fundamental engineering principles [79].
Overall, this study offers a strategic, data-driven map of the simulation research landscape in the built environment. It provides a valuable resource for scholars seeking to position their work within the broader intellectual structure of the field, for educators developing curricula on simulation tools and methods, and for practitioners and policymakers aiming to harness simulation for performance-based design, sustainability, and urban resilience.

Funding

This research received no external funding.

Institutional Review Board Statement

Not applicable.

Informed Consent Statement

Not applicable.

Data Availability Statement

The raw data supporting the conclusions of this article will be made available by the authors on request.

Conflicts of Interest

The authors declare no conflicts of interest.

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Figure 1. A keyword co-occurrence network was created using VOSviewer version 1.6.20, showing seven color-coded clusters. Each node represents a keyword, with its size indicating how often the keyword appears. Lines connecting the nodes represent instances where the keywords appear together in the same document; thicker lines indicate more frequent co-occurrences.
Figure 1. A keyword co-occurrence network was created using VOSviewer version 1.6.20, showing seven color-coded clusters. Each node represents a keyword, with its size indicating how often the keyword appears. Lines connecting the nodes represent instances where the keywords appear together in the same document; thicker lines indicate more frequent co-occurrences.
Metrics 02 00013 g001
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