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

Author： Yuan Weixing Xu Hongyi Khalid Mahmood

ISSN： 1061-8562

Source： International Journal of Computational Fluid Dynamics, Vol.25, Iss.1, 2011-01, pp. : 1-16

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Abstract

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 = Rinner/Router = 0.5 at [image omitted] and flows past an SD7003 airfoil at Rec = 60,000 and angle of attack α = 4° are compared with available experimental and DNS data. Technical difficulties experienced are also discussed.