개선된 PANS 난류 모델을 이용한 둥근 모서리가 있는 사각 실린더 주위 난류 유동에 대한 수치 모사

Abstract

Computational simulations of turbulent flows around a square cylinder with rounded corners were performed to investigate turbulent characteristics at sub-critical and critical Reynolds numbers. A hybrid combination of unresolved turbulence viscosity in PANS and sub-grid scale turbulence viscosity in LES provided a good agreement of drag coefficient and vortex shedding frequency with previous results whereas k-ω SST model in RANS simulation failed to describe a transitional behavior of drag coefficient and vortex shedding frequency at sub-critical and critical Reynolds numbers.