Shear layer modelling with a finite element model - variants of the Munt problems

Manera, Julien, Lielens, Gregory, Caro, Stéphane, Tester, Brian J. and De Mercato, Luigi (2007) Shear layer modelling with a finite element model - variants of the Munt problems. 13th AIAA/CEAS Aeroacoustics Conference (28th AIAA Aeroacoustics Conference), , Rome, Italy. 20 - 22 May 2007. 14 pp .

Abstract

This paper describes an unusual application of a finite element code Actran, which was originally designed to simulate acoustic propagation in potential mean flows. The code is applied to the problem of duct mode radiation through an exhaust nozzle to the far-field; the effects of refraction across the jet shear layer are accounted for, this shear layer being represented as a vortex sheet. The first section presents details of a membrane model of the vortex sheet and a preliminary study of a simple problem which has been used to investigate the membrane parameters and to assess their effect on solutions in the near and far-field. The second section presents some comparisons with Munt-type analytic solutions to demonstrate the validity of this approach. In the third section, a methodology is outlined that will, in future, enable users of the Actran code to use this membrane representation of vortex sheets for more complex problems. Some preliminary results are given to illustrate its application.

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