solidot新版网站常见问题,请点击这里查看。
消息
本文已被查看17875次
A multiscale approach to hybrid RANS/LES wall modeling within a high-order discontinuous Galerkin scheme using function enrichment. (arXiv:1705.08813v2 [physics.flu-dyn] UPDATED)
来源于:arXiv
We present a novel approach to hybrid RANS/LES wall modeling based on
function enrichment, which overcomes the common problem of the RANS-LES
transition and enables coarse meshes near the boundary. While the concept of
function enrichment as an efficient discretization technique for turbulent
boundary layers has been proposed in an earlier article by Krank & Wall (J.
Comput. Phys. 316 (2016) 94-116), the contribution of this work is a rigorous
derivation of a new multiscale turbulence modeling approach and a corresponding
discontinuous Galerkin discretization scheme. In the near-wall area, the
Navier-Stokes equations are explicitly solved for an LES and a RANS component
in one single equation. This is done by providing the Galerkin method with an
independent set of shape functions for each of these two methods; the standard
high-order polynomial basis resolves turbulent eddies where the mesh is
sufficiently fine and the enrichment automatically computes the
ensemble-averaged flow i 查看全文>>