Anisotropic dynamic models for Large Eddy Simulation of compressible flows with a high order DG method

TL;DR

This paper evaluates anisotropic dynamic models for LES of compressible flows using high order DG methods, demonstrating improved near-wall flow predictions compared to traditional models.

Contribution

It introduces an anisotropic dynamic modeling approach within a high order DG framework for compressible LES, enhancing flow feature reproduction near walls.

Findings

Accurately reproduces flow features near walls

Shows improved agreement with DNS data

Effective for Mach numbers up to 1.5

Abstract

The impact of anisotropic dynamic models for applications to LES of compressible flows is assessed in the framework of a numerical model based on high order discontinuous finite elements. The projections onto lower dimensional subspaces associated to lower degree basis function are used as LES filter, along the lines proposed in Variational Multiscale templates. Comparisons with DNS results available in the literature for channel flows at Mach numbers 0.2, 0.7 and 1.5 show clearly that the anisotropic model is able to reproduce well some key features of the flow, especially close to the wall, where the flow anisotropy plays a major role.