Large-eddy simulation of turbulent sheared convection

Abstract

A series of large-eddy simulations of free and sheared convective flow between moving flat plates is presented. Results for free convection are compared with laboratory data. The ratio of friction velocity to the convective velocity scale, u*/w*, is identified as an important parameter in shared convective flow determining the formation of longitudinal rolls. Rolls are found for u*/w*≥0.35, with aspect ratio decreasing as this parameter increases. It is shown that, in this regime, two-dimensional simulations with a prior choice of roll orientation and turbulence length-scale can produce correct velocity variances and roll aspect ratio. -Authors