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Communication Dans Un Congrès Année : 2020

THREE DIMENSIONAL DYNAMICS IN THE WAKE OF AN AHMED BODY

Résumé

A flow around a squareback Ahmed body is simulated with a DNS using the 3D parallel in-house code SUNFLUIDH. A penalization method is applied for the body. The DNS recovers the deviation of the wake observed experimentally [1]. POD is first applied in a plane section in the near wake at mid-height of the body and allows a comparison with experiments. The spatial modes and the histograms of the amplitudes are similar and two main frequencies are extracted, which are related to vortex shedding and wake pumping phenomena. A 3-D POD is then applied to the full velocity field and leads to a better understanding of the deviation phenomenon, linked to the second mode. Moreover, a POD-based low dimensional model captures the main frequencies of the modes in the simulation and correctly estimates the energetic content. This shows the predictive ability of the model.
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hal-04406590 , version 1 (19-01-2024)

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  • HAL Id : hal-04406590 , version 1

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Bérangère Podvin, Stéphanie Pellerin, Y. Fraigneau, Olivier Cadot. THREE DIMENSIONAL DYNAMICS IN THE WAKE OF AN AHMED BODY. 55th 3AF International Conference FP84-AERO2020-pellerin on Applied Aerodynamics, Mar 2020, Poitiers, France. ⟨hal-04406590⟩
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