Title: Hybrid LES-RANS-coupling for complex flows with separation
Authors: Breuer, Michael  
Aybay, Orhan
Jaffrézic, Benoit
Visonneau, Michel
Deng, Ganbo
Guilmineau, Emmanuel
Chikhaoui, Oussama
Language: en_US
Subject (DDC): DDC - Dewey Decimal Classification::000 Informatik, Wissen, Systeme
DDC - Dewey Decimal Classification::500 Naturwissenschaften
DDC - Dewey Decimal Classification::600 Technik
Issue Date: 2009
Editors: Brun, Christophe
Juvé, Daniel
Manhart, Michael
Munz, Claus-Dieter
Publisher: Springer
Document Type: Book Part
Source: In: Numerical simulation of turbulent flows and noise generation / Brun, Christophe. - Berlin : Springer, 2009 . - 2009, Seite 201-229
Journal / Series / Working Paper (HSU): Notes on Numerical Fluid Mechanics and Multidisciplinary Design 
Volume: 104
Page Start: 201
Page End: 229
Publisher Place: Berlin
Abstract: 
The investigations carried out within the French-German DFG-CNRS Research Initiative on 'LES of Complex Flows (FOR 507)' aimed at the development and application of hybrid LES-RANS methods for turbulent flows with separation. The objectives were twofold.On the one hand, the performance of a well-established hybrid approach, namely the detached-eddy simulation, was studied based on really challenging test cases such as the flow over the 3D hill and around the Willy car model. On the other hand, a new hybrid LES-RANS methodologywas set up which aims at overcoming certain drawbacks associated with DES. It relies on the coupling of a near-wall RANS model with LES for the outer flow which allows an appropriate representation of large-scale flow phenomena. In order to take the anisotropies in the near-wall region rigorously into account, an explicit algebraic Reynolds stress model was chosen and its performance in comparison with linear eddy-viscosity models was analyzed for different test cases such as the flow over 2D hills and in a 3D diffuser. A further advantage of the new hybrid method is that no interface predefinition is required. Instead the interface is dynamically determined on-the-fly based on instantaneous physical quantities which guarantees that local changes in the flow are accounted for. © 2009 Springer-Verlag Berlin Heidelberg.
Organization Units (connected with the publication): Strömungsmechanik 
URL: https://api.elsevier.com/content/abstract/scopus_id/62849110584
https://ub.hsu-hh.de/DB=1.8/XMLPRS=N/PPN?PPN=599053143
ISBN: 9783540899556
ISSN: 16122909
DOI: 10.1007/978-3-540-89956-3_9
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