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Energies
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Numerical and Experimental Methods in Research of Renewable Energy Systems
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Numerical and Experimental Methods in Research of Renewable Energy Systems

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "K: State-of-the-Art Energy Related Technologies".

Deadline for manuscript submissions: closed (31 May 2023) | Viewed by 4953

Special Issue Editors

Dr. Krzysztof Rusin

E-Mail Website
Guest Editor
Department of Power Engineering and Turbomachinery, Faculty of Energy and Environmental Engineering, Silesian University of Technology, 44-100 Gliwice, Poland
Interests: CFD methods; turbomachinery; optimisation methods; fluid mechanics;
Special Issues, Collections and Topics in MDPI journals
Dr. Sebastian Rulik

E-Mail Website
Guest Editor
Department of Power Engineering and Turbomachinery, Faculty of Energy and Environmental Engineering, Silesian University of Technology, 44-100 Gliwice, Poland
Interests: CFD methods; turbomachinery; acoustics; heat transfer; fluid mechanics;
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Turbulence is one of the most important phenomena that has been the subject of intense investigations in the past centuries. The vast majority of flows that can be encountered in nature or industry are turbulent and therefore the proper approach to the modelling of turbulent structures is of great importance. Varied length and time scales, as well as the stochastic nature, contribute to the complexity of this phenomenon and pose challenges in the numerical methods.

This Special Issue aims to present and disseminate the most recent advances related to the theory, modelling and application of the turbulence models as well as the investigations of the cases where turbulence is an important factor.

Topics of interest for publication include, but are not limited to:

  • Validation of existing turbulence models
  • Turbulence in multiphase flows
  • Turbulence in climate modelling/meteorology
  • Turbulence control methods
  • Impact of turbulence on fluid flow machinery/heat transfer
  • Application of machine learning in the turbulence modelling
  • Turbulence in nanoconfined channels

Dr. Krzysztof Rusin
Dr. Sebastian Rulik
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • turbulence
  • turbulence models
  • RANS
  • LES
  • subgrid-scale modelling
  • vertex dynamics
  • turbulent scales
  • atmospheric turbulence
  • meteorology
  • machine learning

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Published Papers (2 papers)

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Research

28 pages, 12473 KiB  
Article
Study of Twisted Tape Inserts Segmental Application in Low-Concentrated Solar Parabolic Trough Collectors
by Bartosz Stanek, Jakub Ochmann, Daniel Węcel and Łukasz Bartela
Energies 2023, 16(9), 3716; https://doi.org/10.3390/en16093716 - 26 Apr 2023
Cited by 9 | Viewed by 1956
Abstract
This article presents the results of an analysis of heat enhancement intensification using twisted tapes in linear absorbers for low-concentration parabolic trough collectors, a technology frequently considered as a supplementary energy source for industrial heat production. This contribution proposes a segmented application of [...] Read more.
This article presents the results of an analysis of heat enhancement intensification using twisted tapes in linear absorbers for low-concentration parabolic trough collectors, a technology frequently considered as a supplementary energy source for industrial heat production. This contribution proposes a segmented application of different twisted tapes to intensify heat absorption. A 33.7 mm tubular absorber placed in the collector focal point with an aperture of 1.8 m was selected. The temperature range of the heat transfer fluid was chosen at 60–250 °C. The impact of inserts with twisted ratios of 1, 2 and 4 on system operation was analysed using the Ansys Fluent and mathematical model. The models used were validated based on experimental results from a parabolic trough collector with solar simulator test bench. The results indicated that for the range of mass flow between 0.15–0.3 kg/s, the most optimal is applying twisted ratio 1, except for the highest-temperature section. In this section, it is more optimal to use an insert with a twisted ratio 2, due to the lower need for pumping and the higher efficiency increment. The long-term analysis for the case study plant indicated that the proposed approach increased power gain by 0.27%. Full article
(This article belongs to the Special Issue Numerical and Experimental Methods in Research of Renewable Energy Systems)
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18 pages, 4979 KiB  
Article
Selecting the Safe Area and Finding Proper Ventilation in the Spread of the COVID-19 Virus
by Shahram Karami, Esmail Lakzian, Sima Shabani, Sławomir Dykas, Fahime Salmani, Bok Jik Lee, Majid Ebrahimi Warkiani, Heuy Dong Kim and Goodarz Ahmadi
Energies 2023, 16(4), 1672; https://doi.org/10.3390/en16041672 - 7 Feb 2023
Cited by 6 | Viewed by 2501
Abstract
Coughing and sneezing are the main ways of spreading coronavirus-2019 (SARS-CoV-2). People sometimes need to work together at close distances. This study presents the results of the computational fluid dynamics (CFD) simulation of the dispersion and transport of respiratory droplets emitted by an [...] Read more.
Coughing and sneezing are the main ways of spreading coronavirus-2019 (SARS-CoV-2). People sometimes need to work together at close distances. This study presents the results of the computational fluid dynamics (CFD) simulation of the dispersion and transport of respiratory droplets emitted by an infected person who coughs in an indoor space with an air ventilation system. The resulting information is expected to help in risk assessment and development of mitigation measures to prevent the infection spread. The turbulent flow of air in the indoor space is simulated using the k-ε model. The particle equation of motion included the drag, the Saffman lift, the Brownian force and gravity/buoyancy forces. The innovation of this study includes A: Using the Eulerian–Lagrangian CFD model for the simulation of the cough droplet dispersion. B: Assessing the infection risk by the Wells–Riley equation. C: A safer design for the ventilation system (changing the ventilation supplies and exhausts in the indoor space and choosing the right location for air ventilation). The droplet distribution in the indoor space is strongly influenced by the air ventilation layout. The air-curtain flow pattern significantly reduces the dispersion and spreading of virus-infected cough droplets. When the ventilation air flow occurs along the room length, it takes about 115 s for the cough droplets to leave the space. However, when the ventilation air flow is across the width of the indoor space and there are air curtain-type air flow patterns in the room, it takes about 75 s for the cough droplets to leave the space. Full article
(This article belongs to the Special Issue Numerical and Experimental Methods in Research of Renewable Energy Systems)
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