Validation of correlations-based transition modeling strategies applied to the Spalart-Allmaras turbulence model for the computation of separation-induced transition

Bouchard M.; Marty J.; Deck S.Costes M.

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Validation of correlations-based transition modeling strategies applied to the Spalart-Allmaras turbulence model for the computation of separation-induced transition

机译：Validation of correlations-based transition modeling strategies applied to the Spalart-Allmaras turbulence model for the computation of separation-induced transition

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Predicting the laminar-turbulent transition is becoming a necessity in order to reduce margin costs in the design of turbines and helicopter rotors. Most RANS models lack the capacity to create turbulence sufficiently abruptly to accurately predict separation-induced transition. This article aims at evaluating the performances of the gamma - Re-theta,Re-t strategy applied to the Spalart-Allmaras and k - omega - SST models ((nu) over tilde - gamma -Re-theta,Re-t and k - omega - gamma - Re-theta,Re-t). The chosen test case features a laminar separation bubble over a flat plate. The results are compared to the flows obtained using classical algebraic criteria and validated against DNS data. The effects of the correction by Dacles-Mariani et al. are detailed as well as those of two sets of correlations. The turbulence production mechanism of the present models is too weak downstream of the first increase of intermittency, and the laminar separation bubbles are longer than in the reference flow. More specifically, the (nu) over tilde - gamma - Re-theta,Re-t model with Medida and Baeder's correlations fails to reach the correct levels of turbulence production in the fully turbulent boundary layer. Switching the correlations corrects this last behavior. Finally, using maps of the activation zones of the Dacles-Mariani correction, a sensor is exhibited that could be used in future separation-induced transition modeling efforts. (C) 2021 Elsevier Masson SAS. All rights reserved.

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《Aerospace science and technology》 |2021年第1期|107045.1-107045.16|共16页
作者
Bouchard M.; Marty J.; Deck S.Costes M.;
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作者单位

Helicopters Propellers & Turbomachinery Unit H2T, Aerodynam Aeroelast & Acoust Dept, 8 Rue Vertugadins, Meudon, France;

Adv Turbulence Modeling & Simulat Unit MSAT, Aerodynam Aeroelast & Acoust Dept, 8 Rue Vertugadins, Meudon, France;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种英语
中图分类航空;
关键词
Separation-induced transition; Langtry-Menter model; Boundary layer;

Validation of correlations-based transition modeling strategies applied to the Spalart-Allmaras turbulence model for the computation of separation-induced transition

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