Numerical analysis of a high-order unstructured overset grid method for compressible LES of turbomachinery

JOURNAL OF COMPUTATIONAL PHYSICS

卷:363

Article

de Laborderie, J.¹  Duchaine, F.¹  Gicquel, L.¹  Vermorel, O.¹  Wang, G.²  Moreau, S.² 

[1] CERFACS, CFD Team, 42 Ave Gaspard Coriolis, F-31057 Toulouse, France

[2] Univ Sherbrooke, Dept Mech Engn, Sherbrooke, PQ J1K 2R1, Canada

关键词: Large-Eddy Simulation;    Overset grids;    High-order interpolation;    Turbomachinery;   

DOI  :  10.1016/j.jcp.2018.02.045

来源: Elsevier

【 摘 要 】

Large-Eddy Simulation (LES) is recognized as a promising method for high-fidelity flow predictions in turbomachinery applications. The presented approach consists of the coupling of several instances of the same LES unstructured solver through an overset grid method. A high-order interpolation, implemented within this coupling method, is introduced and evaluated on several test cases. It is shown to be third order accurate, to preserve the accuracy of various second and third order convective schemes and to ensure the continuity of diffusive fluxes and subgrid scale tensors even in detrimental interface configurations. In this analysis, three types of spurious waves generated at the interface are identified. They are significantly reduced by the high-order interpolation at the interface. The latter having the same cost as the original lower order method, the high-order overset grid method appears as a promising alternative to be used in all the applications. (C) 2018 Elsevier Inc. All rights reserved.

【 授权许可】

Free