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Comparison and verification of turbulence Reynolds-averaged Navier–Stokes closures to model spatially varied flows
The robustness and accuracy of Reynolds-averaged Navier–Stokes (RANS) models was investigated for complex turbulent flow in an open channel receiving lateral inflow, also known as spatially varied flow with increasing discharge (SVF). The three RANS turbulence models tested include realizable k–ε, s...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Nature Publishing Group UK
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7642427/ https://www.ncbi.nlm.nih.gov/pubmed/33149223 http://dx.doi.org/10.1038/s41598-020-76128-9 |
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author | Chipongo, Kudzai Khiadani, Mehdi Sookhak Lari, Kaveh |
author_facet | Chipongo, Kudzai Khiadani, Mehdi Sookhak Lari, Kaveh |
author_sort | Chipongo, Kudzai |
collection | PubMed |
description | The robustness and accuracy of Reynolds-averaged Navier–Stokes (RANS) models was investigated for complex turbulent flow in an open channel receiving lateral inflow, also known as spatially varied flow with increasing discharge (SVF). The three RANS turbulence models tested include realizable k–ε, shear stress transport k–ω and Reynolds stress model based on their prominence to model jets in crossflows. Results were compared to experimental laser Doppler velocimetry measurements from a previous study. RANS results in the uniform flow region and farther from the jet centreline were more accurate than within the lateral inflow region. On the leeward side of the jet, RANS models failed to capture the downward velocity vectors resulting in major deviations in vertical velocity. Among RANS models minor variations were noted at impingement and near the water surface. Regardless of inadequately predicting complex characteristics of SVF, RANS models matched experimental water surface profiles and proved more superior to the theoretical approach currently used for design purposes. |
format | Online Article Text |
id | pubmed-7642427 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-76424272020-11-06 Comparison and verification of turbulence Reynolds-averaged Navier–Stokes closures to model spatially varied flows Chipongo, Kudzai Khiadani, Mehdi Sookhak Lari, Kaveh Sci Rep Article The robustness and accuracy of Reynolds-averaged Navier–Stokes (RANS) models was investigated for complex turbulent flow in an open channel receiving lateral inflow, also known as spatially varied flow with increasing discharge (SVF). The three RANS turbulence models tested include realizable k–ε, shear stress transport k–ω and Reynolds stress model based on their prominence to model jets in crossflows. Results were compared to experimental laser Doppler velocimetry measurements from a previous study. RANS results in the uniform flow region and farther from the jet centreline were more accurate than within the lateral inflow region. On the leeward side of the jet, RANS models failed to capture the downward velocity vectors resulting in major deviations in vertical velocity. Among RANS models minor variations were noted at impingement and near the water surface. Regardless of inadequately predicting complex characteristics of SVF, RANS models matched experimental water surface profiles and proved more superior to the theoretical approach currently used for design purposes. Nature Publishing Group UK 2020-11-04 /pmc/articles/PMC7642427/ /pubmed/33149223 http://dx.doi.org/10.1038/s41598-020-76128-9 Text en © The Author(s) 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Chipongo, Kudzai Khiadani, Mehdi Sookhak Lari, Kaveh Comparison and verification of turbulence Reynolds-averaged Navier–Stokes closures to model spatially varied flows |
title | Comparison and verification of turbulence Reynolds-averaged Navier–Stokes closures to model spatially varied flows |
title_full | Comparison and verification of turbulence Reynolds-averaged Navier–Stokes closures to model spatially varied flows |
title_fullStr | Comparison and verification of turbulence Reynolds-averaged Navier–Stokes closures to model spatially varied flows |
title_full_unstemmed | Comparison and verification of turbulence Reynolds-averaged Navier–Stokes closures to model spatially varied flows |
title_short | Comparison and verification of turbulence Reynolds-averaged Navier–Stokes closures to model spatially varied flows |
title_sort | comparison and verification of turbulence reynolds-averaged navier–stokes closures to model spatially varied flows |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7642427/ https://www.ncbi.nlm.nih.gov/pubmed/33149223 http://dx.doi.org/10.1038/s41598-020-76128-9 |
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