k-E乱流モデルの改良 : 改良型E方程式と非線形渦粘性表現の検討

抄録

In the previous paper, the authors proposed a new k-e model and improved prediction accuracy of the mean flow field with longitudinal vortex. But in the high vorticity region, it was difficult to express normal Reynolds stresses accurately in view of Boussinesq assumption. To improve this problem, the authors examined the nonlinear eddy viscosity expression and combined the author's k-E model with it. The fully-elliptic Reynolds-averaged Navier-Stokes (RaNS) and continuity equations are solved with a nonlinear eddy-viscosity turbulence model, where k and E are solved using two-layer technique. Discussions are made concerning the validity of the nonlinear k-E model through the comparison between the computational results and experiments.