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A modified STRUCT model for efficient engineering computations of turbulent flows in hydro-energy machinery

Chaoyue Wang, Fujun Wang, Chenfeng Li Orcid Logo, Changliang Ye, Tingting Yan, Zhichao Zou

International Journal of Heat and Fluid Flow, Volume: 85, Start page: 108628

Swansea University Author: Chenfeng Li Orcid Logo

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DOI (Published version): 10.1016/j.ijheatfluidflow.2020.108628

Abstract

A modified STRUCT (MST) turbulence model for efficient engineering computations of turbulent flows in hydro-energy machinery is proposed in this paper. The MST model switches between URANS and LES-like modes using a new damping function to adjust the turbulent viscosity. Compared with the original S...

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Published in: International Journal of Heat and Fluid Flow
ISSN: 0142-727X
Published: Elsevier BV 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa54593
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spelling 2022-12-07T16:36:56.5683985 v2 54593 2020-07-02 A modified STRUCT model for efficient engineering computations of turbulent flows in hydro-energy machinery 82fe170d5ae2c840e538a36209e5a3ac 0000-0003-0441-211X Chenfeng Li Chenfeng Li true false 2020-07-02 CIVL A modified STRUCT (MST) turbulence model for efficient engineering computations of turbulent flows in hydro-energy machinery is proposed in this paper. The MST model switches between URANS and LES-like modes using a new damping function to adjust the turbulent viscosity. Compared with the original STRUCT method, the modifications are as follows: (1) the BSL k-ω model with the Spalart-Shur correction is chosen as the new baseline to improve the sensitivity to rotation and curvature; (2) a new adaptive time-scale ratio is proposed to avoid the arbitrariness of geometric averaging operation in the original method; (3) the normalized helicity is introduced into the new damping function to detect the energy backscatter phenomenon. Five classical high Reynolds number flow cases are tested. The results show that the turbulent viscosity of the MST model is reasonably reduced in the massively separated regions and LES-like mode is activated, which captures more turbulent vortices and fluctuations on the URANS grids. With high efficiency and robustness, the MST model inherits the advantages of the original STRUCT method and improves the prediction accuracy of the turbulence with rotation and curvature, which enables efficient engineering computations of turbulent flows in hydro-energy machinery. Journal Article International Journal of Heat and Fluid Flow 85 108628 Elsevier BV 0142-727X STRUCT, Turbulence model, Rotation and curvature, Hydro-energy machinery 1 10 2020 2020-10-01 10.1016/j.ijheatfluidflow.2020.108628 COLLEGE NANME Civil Engineering COLLEGE CODE CIVL Swansea University 2022-12-07T16:36:56.5683985 2020-07-02T10:21:53.5745473 Faculty of Science and Engineering School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering Chaoyue Wang 1 Fujun Wang 2 Chenfeng Li 0000-0003-0441-211X 3 Changliang Ye 4 Tingting Yan 5 Zhichao Zou 6 54593__17629__f9a759701f134b009ff0ff65ece76577.pdf 54593.pdf 2020-07-02T15:11:27.7865944 Output 1783936 application/pdf Accepted Manuscript true 2021-07-01T00:00:00.0000000 © 2020. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ true English
title A modified STRUCT model for efficient engineering computations of turbulent flows in hydro-energy machinery
spellingShingle A modified STRUCT model for efficient engineering computations of turbulent flows in hydro-energy machinery
Chenfeng Li
title_short A modified STRUCT model for efficient engineering computations of turbulent flows in hydro-energy machinery
title_full A modified STRUCT model for efficient engineering computations of turbulent flows in hydro-energy machinery
title_fullStr A modified STRUCT model for efficient engineering computations of turbulent flows in hydro-energy machinery
title_full_unstemmed A modified STRUCT model for efficient engineering computations of turbulent flows in hydro-energy machinery
title_sort A modified STRUCT model for efficient engineering computations of turbulent flows in hydro-energy machinery
author_id_str_mv 82fe170d5ae2c840e538a36209e5a3ac
author_id_fullname_str_mv 82fe170d5ae2c840e538a36209e5a3ac_***_Chenfeng Li
author Chenfeng Li
author2 Chaoyue Wang
Fujun Wang
Chenfeng Li
Changliang Ye
Tingting Yan
Zhichao Zou
format Journal article
container_title International Journal of Heat and Fluid Flow
container_volume 85
container_start_page 108628
publishDate 2020
institution Swansea University
issn 0142-727X
doi_str_mv 10.1016/j.ijheatfluidflow.2020.108628
publisher Elsevier BV
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Aerospace, Civil, Electrical, General and Mechanical Engineering - Civil Engineering
document_store_str 1
active_str 0
description A modified STRUCT (MST) turbulence model for efficient engineering computations of turbulent flows in hydro-energy machinery is proposed in this paper. The MST model switches between URANS and LES-like modes using a new damping function to adjust the turbulent viscosity. Compared with the original STRUCT method, the modifications are as follows: (1) the BSL k-ω model with the Spalart-Shur correction is chosen as the new baseline to improve the sensitivity to rotation and curvature; (2) a new adaptive time-scale ratio is proposed to avoid the arbitrariness of geometric averaging operation in the original method; (3) the normalized helicity is introduced into the new damping function to detect the energy backscatter phenomenon. Five classical high Reynolds number flow cases are tested. The results show that the turbulent viscosity of the MST model is reasonably reduced in the massively separated regions and LES-like mode is activated, which captures more turbulent vortices and fluctuations on the URANS grids. With high efficiency and robustness, the MST model inherits the advantages of the original STRUCT method and improves the prediction accuracy of the turbulence with rotation and curvature, which enables efficient engineering computations of turbulent flows in hydro-energy machinery.
published_date 2020-10-01T04:08:14Z
_version_ 1763753584725327872
score 11.035634

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