非構造格子用最小二乗推定対流評価の風上化

概要

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A new method for estimating convection using a incompressible Navier-Stokes solver is presented. A least squares identification method was applied to obtain derivatives around a reference point. Higher order derivatives were also utilized in order to reduce artificial diffusivity caused by firstorder upwinding. An iterative method similar to SMAC (simplified marker and cell) was used for time marching, and least squares estimation was carried out to determine predictors of variables. Therefore, the estimation time can be neglected in the entire calculation. Flow around a cylinder and two-dimensional cavity flow were selected to examine the applicability of the current method. Static pressure distribution and velocity profiles agree fairly well with previously obtained data. However, it was found that artificial viscosity is not negligible, even if higher order derivatives were utilized.
一般社団法人日本機械学会の論文
1997-05-25