Conceptual model to quantify uncertainty in steady-RANS dissipation closure for turbulence behind bluff bodies

Abstract

In turbulent bluff body flows, the presence of vortex shedding, a form of coherent structures, introduces a new characteristic scale that is distinct from the scale of background stochastic turbulence. This double-scale picture essentially invalidates the conventional single-scale modeling for the turbulence energy dissipation in steady-RANS simulations. This paper presents a conceptual model to quantify the uncertainty in the steady-RANS dissipation closure for flows past bluff bodies with vortex shedding.