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Non-reflective inlet conditions for the calculation of unsteadyturbulent compressible flows at low Mach number

Published online by Cambridge University Press:  30 May 2014

Yann Moguen ,
Pascal Bruel ,
Vincent Perrier  and
Erik Dick
Yann Moguen*
Affiliation:
Universitéde Pau et des Pays de l’Adour, LMAP and Inria, Cagire Team, IPRA, Avenue de l’Université, 64013 Pau, France
Pascal Bruel
Affiliation:
CNRS, Université de Pau et des Pays de l’Adour, LMAP and Inria, Cagire Team, IPRA, Avenue de l’Université, 64013 Pau, France
Vincent Perrier
Affiliation:
Inria, Cagire Team and Université de Pau et des Pays de l’Adour, LMAP, IPRA, Avenue de l’Université, 64013 Pau, France
Erik Dick
Affiliation:
Ghent University - Department of Flow, Heat and Combustion Mechanics, Sint-Pietersnieuwstraat, 9000 Gent, Belgique
*
⋆ Corresponding author:yann.moguen@univ-pau.fr
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Abstract

For the unsteady simulation of compressible subsonic flows (Large Eddy Simulation orDirect Numerical Simulation), the proper handling of the inlet boundary is a challengingtask. Indeed, inflow generation through imposition of the velocity may lead to anon-physical reflection of the upstream acoustic waves. In the present contribution, amethod that allows both filtering of these waves and proper imposition of the requiredvariables is proposed. This method is based on identification of the roles of the temporalrate of change of wave amplitudes at the inlet in the low Mach number regime. Theformulation obtained is tested numerically on unsteady one-dimensional flows at low Machnumber for which the unsteady inlet velocity signal is purely harmonic or harmonic withthe superimposition of synthetic turbulence.

Keywords

Non-reflective boundary conditionsinlet conditionslow Mach numberturbulenceacousticsConditions aux limites non réfléchissantesconditions d’entréebas nombre de Machturbulenceacoustique
Type
Research Article
Information
Mechanics & Industry , Volume 15 , Issue 3 , 2014 , pp. 179 - 189
Copyright
© AFM, EDP Sciences 2014

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