境界層遷移を伴う圧縮性翼列流れのLES

第2報, 翼面における遷移境界層の挙動

抄録

Large-eddy simulation of compressible transitional flows in a low-pressure turbine cascade is performed by using 6th-order compact finite-difference and 10th-order filtering method. Numerical results without free-stream turbulence and those with about 5% of free-stream turbulence are compared. Based on the computed results detailed investigations are presented on the effects of the free-stream turbulence on the boundary layer transition, and behavior of the pressure waves that originate near the trailing-edge along with its effects on the separation/transition of the boundary layer. Also, based on Snapshot Proper Orthogonal Decomposition (POD) Analysis, dominant behaviors of the transitional boundary layers are investigated.