The coupled les - Subgrid stochastic acceleration model (LES-SSAM) of a high Reynolds number flows

Abstract

In the present work, in order to take into account the intermittency phenomena, we proposed a new approach to the LES of constant-density flows. In this approach, the main step is to reconstruct an approximation for unfil-tered velocity field based on stochastic simulation of non-resolved (unknown) fluid particle acceleration. The last one is modeled with accounting for its significant dependency on the Reynolds number. In comparison with classical LES, the model reproduces effects which are recently observed by measurements in a high Reynolds number homogeneous turbulence.