乱流の直接数値シミュレーションにおける差分式の整合性

概要

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With the recent advances in large-scale computers and high-accuracy numerical methods, direct numerical sinulation (DNS) has become a valuable resource in turbulence research. The NDS technique can be divided into two methods. Many DNS's have been performed through the spectral methods because of their high accuracy ; however, the spectral method is hard to be applied to complex geometries. On the other hand, the finite-difference method can be applied to complex geometries ; although its numerical accuracy has not been systematically evaluated. In this paper, fully developed turbulent channel flow is simulated using the finite-difference method. The second order central difference scheme consistent with the continuity equation is proposed for the convective term. The results obtained with use of this scheme are in good agreement with the DNS data bases obtained with the spectral method. The finite-difference techniques for the terms in the budget of the Reynolds stress equation are also discussed.
一般社団法人日本機械学会の論文
1994-10-25