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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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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
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa54593
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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 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.
Keywords: STRUCT, Turbulence model, Rotation and curvature, Hydro-energy machinery
Start Page: 108628