Unstructured Large Eddy Simulation of the passive control of the flow in a weapon bay

• Published in: Journal of fluids and structures Vol. 24; no. 8; pp. 1204 - 1215
• Main Authors: Levasseur, V., Sagaut, P., Mallet, M., Chalot, F.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Kidlington Elsevier Ltd 01.11.2008; Elsevier
• Subjects: Acoustics; Aeroacoustics, atmospheric sound; Aerodynamics; Applied fluid mechanics; Cavity flow; Computational fluid dynamics; Exact sciences and technology; Flow control; Fluid dynamics; Fluid flow; Fundamental areas of phenomenology (including applications); General theory; Holes; Large Eddy simulation; Marine; Physics; Rossiter aero–acoustic mode; Shear layers; Turbulence; Turbulence simulation and modeling; Turbulent flow; Turbulent flows, convection, and heat transfer; Rossiter aero–acoustic mode; Flow control; Turbulence; Cavity flow; Large Eddy simulation; Unstructured mesh; Turbulent flow; Computational fluid dynamics; Reynolds number; Crossflow; Passive system; Experimental study; Fight aircraft; Noise control; Mixing layer; Cavities; Large eddy simulation; Rossiter aero-acoustic mode; Wakes; Linear stability; Aeroacoustics; Shear layer; Mesh generation; Turbulence structure
• ISSN: 0889-9746; 1095-8622
• DOI: 10.1016/j.jfluidstructs.2008.06.016

The control of cavity flows has been investigated by the means of Large Eddy Simulations. The computations have been carried out on unstructured meshes to assess the efficiency of two passive acoustic oscillation suppression devices: the rod-in-crossflow and the flat-top spoiler. Despite a sustained interest and many experiments, a clear explanation for observed reduction in the flow-induced structure load is still missing. This work explores different hypotheses: the modification of the mean field and its linear stability properties, a pure deflection effect of the separated shear layer, or scale coupling between the rod wake and the turbulent mixing layer over the cavity. The aim here is to enhance the experimental database and provide leads towards a better understanding of the phenomena. The selected test-case is a cavity of length/depth ratio equal to 5, at Mach and Reynolds number of M ∞ = 0.85 and Re L = 7 . 10 6 , respectively.