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LES-VMS SIMULATIONS OF THERMALLY STRATIFIED TURBULENT WAKES BEHIND TOWED AND AUTO-PROPELLED AXISYMMETRICAL BODY

B. Sainte-Rose
LEMMA USA, inc. Houston, TX, 77008, USA

X. Lenhardt
DGA Techniques Navales Toulon, 83050, France

O. Allain
LEMMA Sophia-Antipolis, 06140, France

M. Berton
LEMMA Toulouse, 31600, France

Alain Dervieux
LEMMA Sophia-Antipolis, 06140, France

Résumé

Numerical simulations of close and far wakes behind an axisymmetrical body in a stratified medium are carried out using a Large Eddy Simulation - Variational Multi Scale approach to model turbulence. Towed and auto-propelled flow regimes are scrutinized and compared. The characteristic parameters of the flow are Pr = 7, Re = 10000 based on the diameter of the cylinder and F = 25. Realistic results are obtained for the towed case where the so-called three-dimensional (3D), non-equilibrium (NEQ) and quasi two-dimensional (Q2D) regimes are exhibited with very good agreement with experimental and theoretical findings of the litterature. In addition, the effect of auto-propulsion on the flow dynamics is reproduced in a satisfying manner.