後ろ向きステップ流解析における有限要素法の計算条件の影響

概要

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The numerical analysis is performed for the flow past a backward-facing step. While the Reynolds number and the expansion ratio are the characteristic parameters which physically define the flow field, boundary conditions and mesh discretizations are numerical conditions which influence the analyzed results. The difference in these numerical conditions makes it ambiguous to compare numerical results obtained by various kinds of formulations. The purpose of this study is to estimate the effects of numerical conditions. The two-dimensional, steady Navier-Stokes equations are formulated by the Galerkin finite-element method and calculated for the Reynolds number Re=100 and 333 and the expansion ratio 1.5. Numerical conditions in this study are upstream and downstream regions of calculation, Dirichlet and Neumann boundary conditions for inflow and outflow and the size of finite elements. Quantitative comparison between L_2 norms is shown and the new numerical criterion of fully developed flow is presented.
一般社団法人日本機械学会の論文
1992-06-25