Turbulence simulation of flow that passes around a square cylinder from the utilization of large-scale simulation and immersed boundaries

A Large Eddy Simulation study of flow around a square cylinder at low Reynolds number is presented. The Large Eddy Simulation is based on structure function subgrid models. To assess this method's relevance to industrial and engineering flows, immersed boundary conditions are implemented to render the solid surface, i.e. the square rod. We also introduce an artificial acoustic stiffness reduction for fully compressible flows which allows a much higher time step to be implemented. Very high quality results are obtained without the usually high cost of process time and memory requirements associated with LES. The proposed method opens a new approach to high precision modeling for heat transfer, acoustics and mechanical vibrations problems of real flows with complex geometries.