Hybrid RANS/LES방법을 이용한 아음속 공동 유동의 수치적 모사

Abstract

A numerical simulation of an incompressible cavity flow is conducted using the hybrid turbulence model. The model adopted is a modified type of DES using k-ε two-equation model. Cavity geometry and flow condition are based on Cattafesta`s experiment. Computational results are compared with the results of Cattafesta`s experiment. The simulation successfully predicts the oscillatory features and the Strouhal number of the oscillation compares very favorably with that of the dominant mode of experimental data. Vorticity contours obtained from the simulation data are consistent with the smoke visualization of the Cattafesta`s experiment. The coherent structures of cavity flow are also investigated using Q criterion.