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Modélisation et simulation de la turbulence compressible en milieu diphasique : application aux écoulements cavitants instationnaires

Abstract : The computation of cavitating flows is a challenging issue due to the characteristics of these flows : phase transition, large density gradient, Mach number variation, interaction between phases and turbulent flow, unsteadiness. In the present study, we performed a derivation of the one-fluid compressible homogenous model coupled with a RANS approach for the turbulent flow. From these equations and the nature of the cavitating flows, several models based on the eddy viscosity assumption have been tested : weakly non-linear models (SST and realisability corrections), compressible turbulence models, hybrid RANS/LES turbulence models (SAS, DES) and the Reboud correction. All the models are implemented in a compressible code, which solves the equations using an implicit dual-time stepping method coupling with a pre-conditionning technique for the incompressible area. 2D and 3D computations are performed on two Venturi geometries characterized by an unsteady cavitation sheet with a liquid/vapor re-entrant jet. All the models are able to capture the re-entrant jet. Nevertheless, the dynamic behaviour differs from one model to another and the lack of experimental data prevents to discriminate the models between them. From the results, the computations with the SAS model and the Reboud correction improve the prediction of the flow.
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https://tel.archives-ouvertes.fr/tel-00814309
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Submitted on : Thursday, May 2, 2013 - 2:22:13 PM
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  • HAL Id : tel-00814309, version 2

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Jean Decaix. Modélisation et simulation de la turbulence compressible en milieu diphasique : application aux écoulements cavitants instationnaires. Autre. Université de Grenoble, 2012. Français. ⟨NNT : 2012GRENI061⟩. ⟨tel-00814309v2⟩

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