Abstract
The scope of this paper is to analyze the performance of wall-layer model Large Eddy Simulation (WLES) in the prediction of flow separation under stable stratification. This is a fundamental problem of practical importance both in industrial and in environmental applications. We consider turbulent flow in a plane asymmetric diffuser because this simple configuration is particularly challenging for testing the performance of numerical models to reproduce flow separation. Further, this flow has been previously investigated both experimentally and numerically. A sketch of the geometry is in Fig. 1. Depending on the slope of the diffuser and on the Reynolds number (Re=ul/ν with u and l characteristic velocity and length scale of the problem, while ν is the kinematic viscosity) separation occurs.
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