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Etude du couplage instationnaire calculs-expériences en écoulements turbulents

Abstract : This work comes within the framework of the generation of realistic unsteady inlet conditions for Large Eddy Simulations (LES) of turbulent flows. The strategy developed consists in generating from under resolved in time experimental data and a low dimensional modelling approach, some inflow conditions representative of the large scale structures of the flow in the inlet section of the computational domain. This approach involves three steps : acquisition of an experimental database by dual time stereoscopic particle image velocimetry (DT-SPIV), development of a low order dynamical system (LODS) from the database, adaptation of the experimental data to the grid of the inlet section of the simulation. The proposed method is tested on two turbulent mixing layer flows developing downstream of a splitter plate that can be either bevelled or blunt. The investigation of these two flows is made through two-point hot wire measurements, allowing the proper orthogonal decomposition (POD) to be used. In the two configurations, a database is acquired by DT-SPIV and a LODS, reproducing the temporal dynamics of the coherent structures of the flow, is derived by a novel method of polynomial model identification. Finally, the data obtained are used as inflow conditions of a LES of a turbulent plane mixing layer.
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https://tel.archives-ouvertes.fr/tel-00011370
Contributor : Laurent Perret <>
Submitted on : Thursday, January 12, 2006 - 6:06:52 PM
Last modification on : Monday, March 18, 2019 - 5:18:04 PM
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Laurent Perret. Etude du couplage instationnaire calculs-expériences en écoulements turbulents. Dynamique des Fluides [physics.flu-dyn]. Université de Poitiers, 2004. Français. ⟨tel-00011370⟩

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