Application of DDES and IDDES with shear layer adapted subgrid length-scale to separated flows

18th International Conference PhysicA.SPb

Guseva, E.K.^1 ; Garbaruk, A.V.^1 ; Strelets, M.Kh.^1

Peter the Great St. Petersburg Polytechnic University, 29 Polytechnicheskaya Str., St.-Petersburg

195251, Russia^1

关键词: Comparative studies;    Delayed detached eddy simulation (DDES);    Hybrid RANS-LES;    Length scale;    Separated flows;    Separated shear layers;    Shear layer;    Three-dimensional turbulence;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/769/1/012081/pdf
DOI  :  10.1088/1742-6596/769/1/012081

来源: IOP

【 摘 要 】

A comparative study is conducted of the original versions of Delayed Detached- Eddy Simulation (DDES) and Improved DDES (IDDES) and these approaches combined with "shear-layer-adapted" (SLA) subgrid length-scale proposed recently for resolving the issue of delayed RANS-to-LES transition in separated shear layers in global hybrid RANS-LES approaches. Computations were carried out of two separated flows: a transonic flow past M 219 cavity and a subsonic flow over NASA wall mounted hump. Results of the computations suggest that the use of the SLA subgrid length-scale considerably accelerates transition to resolved three-dimensional turbulence in the separated shear layers and substantially improves agreement with the experimental data.