A dynamic pressure-sink method for improving large eddy simulation and hybrid Reynolds-averaged Navier-Stokes/large eddy simulation of wall-bounded flows

作者：Wang, H; Qin, N; Sun, M; Wang, Z^*

来源：Proceedings of the Institution of Mechanical Engineers - Part G: Journal of Aerospace Engineering , 2012, 226(G9): 1107-1120.

DOI：10.1177/0954410011417793

• LES
• hybrid RANS/LES
• near-wall treatment
• compressible
• boundary layer

A dynamic method based on introducing pressure sinks at the wall boundary is proposed to improve hybrid Reynolds-averaged Navier-Stokes/large eddy simulation (RANS/LES) and LES on under-resolved meshes of wall-bounded flows. The basic spirit is to enhance the momentum transfer in the boundary layer from the outer layer to the inner layer by introducing a small pressure gradient in the wall-normal direction, so that the skin friction, usually underestimated in hybrid RANS/LES and LES on under-resolved meshes, can recover to the correct level. The dynamic pressure-sink method, applied to LES and hybrid RANS/LES, is first numerically tested in simulating a supersonic flat-plate boundary flow, for which the turbulent inflow condition is treated by the recycling/rescaling approach. The results show obvious improvement as compared to the baseline LES and hybrid RANS/LES results on the same mesh. The method is then applied to LES of a supersonic flow over a compression-expansion ramp, where improved results are also achieved.

• 出版日期2012-9
• 单位中国人民解放军国防科学技术大学