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Fluids, Volume 10, Issue 7

2025 July - 26 articles

Cover Story: Stenoses are commonly found in biological systems and present complex flow physics that are challenging to capture. An accurate representation of stenotic flow is crucial; however, Reynolds-averaged Navier–Stokes models have shown variability in their flow predictions. The GEKO model offers flexibility through its adjustable parameters without affecting the underlying empirical turbulence model constants. In this study, we investigate how the GEKO model parameters affect the flow field for a range of stenosis geometries at Reynolds numbers of 1000 and 2000. The results are compared with previously published experimental data and demonstrate significant improvements over commonly used turbulence models, indicating that the GEKO model can yield more precise flow predictions in similar geometries. View this paper
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Articles (26)

  • Article
  • Open Access
840 Views
13 Pages

21 July 2025

The use of implants in the trachea is increasing in respiratory diseases as an alternative to address pathological problems with airway obstruction. This article presents the design and development of a three-way cannula and its evaluation in a testb...

  • Article
  • Open Access
1,051 Views
34 Pages

14 July 2025

Infectious diseases can spread through virus-laden respiratory droplets exhaled into the air. Ventilation systems are crucial in indoor settings as they can dilute or eliminate these droplets, underscoring the importance of understanding their effica...

  • Article
  • Open Access
2 Citations
1,981 Views
21 Pages

13 July 2025

Understanding the rheological properties of fresh cement slurries is essential to maintain optimal pumpability, achieve dependable zonal isolation, and preserve long-term well integrity in oil and gas cementing operations and the 3D printing cement a...

  • Article
  • Open Access
1,062 Views
19 Pages

12 July 2025

Numerous dark linear recurrent features called Recurring Slope Lineae (RSL) are observed on Martian surfaces, hypothesized as footprints of high-salinity liquid flow. This paper experimentally examined this “wet hypothesis” by analyzing t...

  • Article
  • Open Access
1,816 Views
29 Pages

11 July 2025

Presented in this work is a harmonic balance (HB)-based pseudo-time code-coupling approach applied to a one-degree-of-freedom vortex-induced vibration (VIV) problem of a circular cylinder in a low-Reynolds-number laminar flow regime. Unlike physical...

  • Article
  • Open Access
2,068 Views
27 Pages

10 July 2025

Thermal energy storage plays a vital role in enhancing the efficiency of energy systems, particularly in building applications. Phase change materials (PCMs) have gained significant attention as a passive solution for energy management within buildin...

  • Article
  • Open Access
933 Views
16 Pages

Numerical Study on the Shear Stress Field Development on Dam Break Flows of Viscoplastic Fluids

  • Roberta Brondani Minussi,
  • Marcus Vinícius Canhoto Alves and
  • Geraldo de Freitas Maciel

10 July 2025

The dam break flow problem consists of the phenomena where a fluid is suddenly released and is often used as a test case for multiphase flows numerical models or to analyze the underlying physics of complex free surface flows of both Newtonian and no...

  • Article
  • Open Access
1 Citations
655 Views
18 Pages

Reduced-Order Model for Catalytic Cracking of Bio-Oil

  • Francisco José de Souza,
  • Jonathan Utzig,
  • Guilherme do Nascimento,
  • Alicia Carvalho Ribeiro,
  • Higor de Bitencourt Rodrigues and
  • Henry França Meier

7 July 2025

This work presents a one-dimensional (1D) model for simulating the behavior of an FCC riser reactor processing bio-oil. The FCC riser is modeled as a plug-flow reactor, where the bio-oil feed undergoes vaporization followed by catalytic cracking reac...

  • Article
  • Open Access
4 Citations
1,947 Views
21 Pages

6 July 2025

Smectite clay minerals are known to readily form thixotropic physical gels in aqueous media, even at low volume fractions. Although the rheological properties of these gels are closely related to the microstructure of the network, the influence of th...

  • Article
  • Open Access
1,019 Views
23 Pages

Experimental Investigation of the Entrainment Mechanism in Circular and Lobed Hemispherical Jets

  • Saad Aldossary,
  • Mouhammad El Hassan,
  • Nikolay Bukharin,
  • Kamel Abed-Meraim and
  • Anas Sakout

6 July 2025

Better mixing in the near-field region of jets with their surrounding fluid is of high interest for several industrial applications. Passive control that involves jet geometry modifications as compared to the traditional circular design is used in th...

  • Article
  • Open Access
1 Citations
1,026 Views
15 Pages

4 July 2025

This study addresses computational challenges in the immersed boundary method (IBM) with the pressure implicit with split operator (PISO) algorithm for simulating incompressible flows. We introduce a novel time-step splitting method to implement comm...

  • Article
  • Open Access
2 Citations
1,238 Views
21 Pages

3 July 2025

Porous media have great application prospects, such as transpiration cooling for the aerospace industry. The main challenge for the prediction of gas permeability includes the geometrical complexity and high Knudsen number of gas flow at the nano-sca...

  • Article
  • Open Access
1 Citations
1,300 Views
15 Pages

2 July 2025

Pump-driven liquid cooling systems are widely utilized in unmanned aerial vehicle (UAV) electronic thermal management. As a critical power component, the miniaturization and lightweight design of the pump are essential. Increasing the operating speed...

  • Article
  • Open Access
751 Views
18 Pages

Hybrid Estimation of Inflow Multiphase Production Rates Using a Dynamic Wellbore Flow Model

  • Anton Gryzlov,
  • Eugene Magadeev,
  • Andrey Kovalskii and
  • Muhammad Arsalan

30 June 2025

This paper considers the problem of estimating the quantitative parameters of a two-phase fluid flow in a well based on the dynamic physical flow model. This is a challenging problem in the oil and gas industry, where the knowledge of multiphase prod...

  • Article
  • Open Access
658 Views
16 Pages

Numerical Investigation of a Gas Bubble in Complex Geometries for Industrial Process Equipment Design

  • Daniel B. V. Santos,
  • Antônio E. M. Santos,
  • Enio P. Bandarra Filho and
  • Gustavo R. Anjos

30 June 2025

This study investigates three-dimensional two-phase flows in complex geometries found in industrial process equipment design using finite-element numerical simulations. The governing equations are formulated in three-dimensional Cartesian coordinates...

  • Article
  • Open Access
1 Citations
1,412 Views
30 Pages

30 June 2025

This study investigates the interaction between airflow and low-density bulk particles within vertical screw conveyors and examines its impact on conveying performance. A combined simulation approach integrating the Discrete Element Method and Comput...

  • Review
  • Open Access
2 Citations
1,013 Views
17 Pages

29 June 2025

Droplet spreading is a fascinating phenomenon. Especially when the droplet spreads, reacts, and dissolves on and into metal substrates. This reactive wetting mainly occurs at high temperatures, with a vast number of applications in industry and mater...

  • Article
  • Open Access
944 Views
13 Pages

Rheological Features of Aqueous Polymer Solutions Tailored by Hydrodynamic Cavitation

  • Santiago Nicolás Fleite,
  • María del Pilar Balbi,
  • María Alejandra Ayude and
  • Miryan Cassanello

29 June 2025

Hydrodynamic cavitation (HC) has emerged as a versatile method for modifying the rheological properties of polymer solutions, offering advantages such as scalability and operational simplicity. This work investigates the effect of HC on aqueous polya...

  • Article
  • Open Access
2,021 Views
23 Pages

Tuned Generalised k-ω (GEKO) Turbulence Model Parameters for Predicting Transitional Flow Through Stenosis Geometries of Various Degrees

  • Jake Emmerling,
  • Sara Vahaji,
  • David A. V. Morton,
  • Svetlana Stevanovic,
  • David F. Fletcher and
  • Kiao Inthavong

28 June 2025

Stenosis geometries are constrictions of a biological tube that can be found in many forms in the human body. Capturing the flow field in such geometries is important. For this purpose, simulations were performed using the generalised k-ω (GEKO...

  • Article
  • Open Access
1 Citations
3,818 Views
22 Pages

Quantitative Assessment of Red Blood Cell Disaggregation in Chronic Lymphocytic Leukemia via Software Image Flow Analysis

  • Anika Alexandrova-Watanabe,
  • Emilia Abadjieva,
  • Miroslava Ivanova,
  • Lidia Gartcheva,
  • Ariana Langari,
  • Margarita Guenova,
  • Tihomir Tiankov,
  • Elena V. Nikolova,
  • Sashka Krumova and
  • Svetla Todinova

27 June 2025

Red blood cell (RBC) aggregation and disaggregation are key factors in microcirculatory flow, and their disturbance can lead to alterations in the rheological properties of blood in disorders such as chronic lymphocytic leukemia (CLL). This study aim...

  • Review
  • Open Access
3 Citations
2,989 Views
17 Pages

27 June 2025

Cardiovascular diseases remain the leading cause of morbidity and mortality worldwide, underscoring the need for continuous innovation in diagnostics and treatment. Mock circulation loops (MCLs) systems have recently emerged as new research platforms...

  • Article
  • Open Access
1,301 Views
31 Pages

Particle Image Velocimetry Analysis of Bedload Sampling in a Sand-Bed River

  • Rodrigo B. Pereira,
  • Glauber A. Carvalho,
  • Tobias Bleninger,
  • Pedro A. P. Zamboni,
  • Liege Wosiacki,
  • Fábio V. Gonçalves and
  • Johannes Gérson Janzen

27 June 2025

Both the excess and alteration of bed sediments in river systems can cause socioeconomic and environmental damage; thus, the quantification of bedload transport is an important tool to assess the health of rivers and help in decision-making imposed b...

  • Article
  • Open Access
5 Citations
1,869 Views
33 Pages

AI-Driven Surrogate Model for Room Ventilation

  • Jaume Luis-Gómez,
  • Francisco Martínez,
  • Alejandro González-Barberá,
  • Javier Mascarós,
  • Guillem Monrós-Andreu,
  • Sergio Chiva,
  • Elisa Borrás and
  • Raúl Martínez-Cuenca

26 June 2025

The control of ventilation systems is often performed by automatic algorithms which often do not consider the future evolution of the system in its control politics. Digital twins allow system forecasting for a more sophisticated control. This paper...

  • Article
  • Open Access
630 Views
34 Pages

Experimental and Numerical Study of Film Boiling Around a Small Nickel Sphere

  • Charles Brissot,
  • Léa Cailly-Brandstäter,
  • Romain Castellani,
  • Elie Hachem and
  • Rudy Valette

24 June 2025

This work—mixing an original experimental approach, as well as numerical simulations—proposes to study film boiling modes around a small nickel sphere. While dealing with a simple looking phenomenon that is found in many industrial proces...

  • Article
  • Open Access
1 Citations
2,133 Views
23 Pages

21 June 2025

Proper determination of the bottomhole pressure in a gas lift well is essential to enhance production, tackle operating concerns, and use the least amount of gas. Mechanistic models, empirical correlation, and hybrid models are usually limited by the...

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Fluids - ISSN 2311-5521