Publication type: Conference paper
Type of review: Not specified
Title: A gas-kinetic scheme for the simulation of turbulent flow
Authors: Righi, Marcello
Proceedings: Proceedings of the 29th International Symposium on Rarefied Gas Dynamics
Conference details: 29th International Symposium on Rarefied Gas Dynamics, Xi'an, China, 13-18 July 2014
Issue Date: 2014
Publisher / Ed. Institution: RGD29
Publisher / Ed. Institution: Xi'an
ISBN: 978-0-7354-1265-1
Language: English
Subjects: Turbulence Modelling; Gas-Kinetic; RANS; Boltzmann
Subject (DDC): 530: Physics
Abstract: A BGK gas-kinetic scheme may simulate turbulent flow, provided the relaxation time is defined in such a way, that it accounts for the unresolved turbulent fluctuations. In this study, a simple turbulent gas-kinetic scheme is developed by coupling the evolution of conservative variables to a two-equation turbulence model. Its behavior is compared to the one of conventional schemes, based on the Navier-Stokes equations, by simulating turbulent flow cases with strong interactions between shocks and boundary layer. Whereas conventional schemes are known to fail, or to be rather inaccurate, the turbulent gas-kinetic scheme provides results which are consistently good or at least acceptable for engineering standards. It is argued, that gas-kinetic schemes have an in-built “multiscale” sensor which correct advection whenever the ratio of unresolved to resolved scales of motion raises above negligible values.
Fulltext version: Published version
License (according to publishing contract): Licence according to publishing contract
Departement: School of Engineering
Organisational Unit: Institute of Mechanical Systems (IMES)
Appears in collections:Publikationen School of Engineering

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