時間平均速度勾配テンソルの第2不変量を用いたk-ε乱流モデルの再構成に関する研究

概要

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Many numerical schemes have been developed to reproduce complicated flow fields around ship stern. However, most of them have turned out to be insufficient due to inadequate accuracy of the numerical scheme, grid resolution, and turbulence modeling. The recent workshops stated that turbulence modeling may be the most important issue for the problem. This paper presents a new turbulent energy dissipation model for application to a turbulent flow with longitudinal vortex. The standard εequation is modified so as to provide more realistic time mean flow and Reynolds-stress fields. The fully-elliptic RaNS (Reynolds-averaged Navier-Stokes equation) and continuity equations are solved with an eddy-viscosity turbulence model, where k and εare solved using two-layer technique. Discussions are made concerning the validity of the new turbulence model comparing with existing turbulence models and experiments.
社団法人日本船舶海洋工学会の論文
1998-09-25