Large-Eddy Simulation of Turbulent Sheared Convection

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  • 1 A.R.A.P. Division, California Research and Technology, Inc., A Titan Company, Princeton, New Jersey
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Abstract

A series of large-eddy simulators 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 sale,u*/w*,is identified as an important parameter in sheared 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 proper choice of roll orientation and turbulence length-scale can produce correct velocity variances and roll aspect ratio.

Abstract

A series of large-eddy simulators 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 sale,u*/w*,is identified as an important parameter in sheared 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 proper choice of roll orientation and turbulence length-scale can produce correct velocity variances and roll aspect ratio.

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