Please use this identifier to cite or link to this item: https://doi.org/10.21256/zhaw-4907
Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: A modified gas-kinetic scheme for turbulent flow
Authors : Righi, Marcello
DOI : 10.21256/zhaw-4907
10.4208/cicp.140813.021213a
Published in : Communications in Computational Physics
Volume(Issue) : 16
Issue : 1
Pages : 239
Pages to: 263
Issue Date: Jul-2014
Publisher / Ed. Institution : Global Science Press
ISSN: 1815-2406
1991-7120
Language : English
Subjects : Physics - fluid dynamics
Subject (DDC) : 530: Physics
Abstract: The implementation of a turbulent gas-kinetic scheme into a finite-volume RANS solver is put forward, with two turbulent quantities, kinetic energy and dissipation, supplied by an allied turbulence model. This paper shows a number of numerical simulations of flow cases including an interaction between a shock wave and a turbulent boundary layer, where the shock-turbulent boundary layer is captured in a much more convincing way than it normally is by conventional schemes based on the Navier-Stokes equations. In the gas-kinetic scheme, the modeling of turbulence is part of the numerical scheme, which adjusts as a function of the ratio of resolved to unresolved scales of motion. In so doing, the turbulent stress tensor is not constrained into a linear relation with the strain rate. Instead it is modeled on the basis of the analogy between particles and eddies, without any assumptions on the type of turbulence or flow class. Conventional schemes lack multiscale mechanisms: the ratio of unresolved to resolved scales – very much like a degree of rarefaction – is not taken into account even if it may grow to non-negligible values in flow regions such as shocklayers. It is precisely in these flow regions, that the turbulent gas-kinetic scheme seems to provide more accurate predictions than conventional schemes.
Further description : Published online: 16 April 2014, erworben im Rahmen der Schweizer Nationallizenzen (www.nationallizenzen.ch)
URI: https://digitalcollection.zhaw.ch/handle/11475/13398
Fulltext version : Published version
License (according to publishing contract) : Licence according to publishing contract
Restricted until : 2019-07-01
Departement: School of Engineering
Organisational Unit: Institute of Mechanical Systems (IMES)
Appears in Collections:Publikationen School of Engineering

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