A DG Implementation of a Novel Hybrid RANS/LES Technique With RANS Reconstruction
Abstract
A new hybrid RANS/LES technique, based on the hybrid filter proposed by Germano in 2004, has been studied. The novelty herein introduced is represented by the reconstruction of the Reynolds stress tensor. As a consequence, no explicit RANS model is needed. The RANS and LES terms are merged using a constant blending factor. The model is implemented in a numerical code based on a high order Discontinuous Galerkin (DG) finite element formulation. The test case considered for numerical simulations is the turbulent tur- bulent channel flow at Mach = 0.2. The comparison with available DNS data shows a good agreement and, in general, an improvement with re- spect to pure LES results, confirming that the technique herein proposed represents a promising approach to the numerical simulation of turbulent flows.
Keywords
Cite
@article{arxiv.1411.4882,
title = {A DG Implementation of a Novel Hybrid RANS/LES Technique With RANS Reconstruction},
author = {Antonella Abbà and Massimo Germano and Michele Nini and Marco Restelli},
journal= {arXiv preprint arXiv:1411.4882},
year = {2014}
}