Analysis of the Reynolds stress tensor for unsteady flows in URANS models
Résumé
The present work analyzes the Reynolds stress tensor for unsteady URANS models through the use of the triple decomposition of the instantaneous velocity field. To that end, we assessed the performance of two turbulence models, the SST and SST-SAS, in the turbulent flow over a 3D tube bundle as a test case. Our simulation results are compared with available results using RSM models taken from the literature. It was found that a substantial amount of the resolved motion contributes to the total velocity correlations. The SST-SAS model featured a remarkably greater contribution of the resolved part over the modeled part in comparison with the other URANS models.
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