Large-eddy simulation of curved-geometry flows using contravariant components of velocity

摘要

The current large-eddy simulation (LES) research makes use of the contravariant components as the dependent variables on a staggered grid system for the discretisation of the governing equations in curvilinear coordinates. This technology provides a possibility to investigate efficiently turbulent flows in complex geometries. To test and validate the recently developed in-house LES code, LESSGA (Large-Eddy Simulation on a Staggered Grid Arrangement), numerical simulations were performed for turbulent flows in a concentric annular pipe and transitional flows past an airfoil. In this article, the computed results of flows in a concentric annular pipe with a radius ratio of a = R_(inner)/R_(outer) = 0.5 at Re_t = 100- 200 and flows past an SD7003 airfoil at Re_c = 60,000 and angle of attack a = 48 are compared with available experimental and DNS data. Technical difficulties experienced are also discussed.