高次精度保存型IDO法によるラージエディ・シミュレーション(数値計算(2),一般講演)

概要

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The resolution of a numerical scheme is one of the most important requirements to calculate turbulent flows. A conservative form of the interpolated differential operator (IDO-CF) scheme is a multi-moment Eulerian scheme in which point values and integrated average values are separately defined in one cell. It is unique that the volume averaged value is based on the exact finite volume formulation. For a large-eddy simulation (LES), we use the coherent structure model (CSM) in which the model coefficient is locally obtained by a coherent structure extracted from a second invariant of the velocity gradient tensor, and the model coefficient correctly satisfies asymptotic behaviors to walls. The IDO-CF scheme with the CSM gives better turbulent intensities than the conventional FDM with the same number of grid points. The turbulent statistics calculated by IDO-CF scheme are in good agreement with the DNS at Re_γ=180. It is found that the IDO-CF scheme is suitable for the turbulent flow computation and improves the turbulent statistics with compact stencils.
2010-09-09