Large-Eddy Simulations of High Reynolds Number Flow Around a Circular Cylinder
Large-eddy simulations (LES) of the transitional and turbulent flow around a circular cylinder at a subcritical Reynolds number of 140000 are performed with a novel technique using staggered Cartesian grids. This technique is implemented in the code MGLET, a parallel Cartesian Navier-Stokes solver for DNS and LES which uses second-order central space and time discretizations and fractional time-stepping together with an iterative solver for the pressure-Poisson equation. The simulations were performed on the Hitachi SR8000-F1 with maximally 16 nodes. They demonstrate the effect of the grid resolution and the need to properly resolve the boundary and shear layers in order to predict the near wake flow reliably. A still unresolved computational issue is, how the necessary size of the computational domain in spanwise direction, namely several cylinder diameters, can be practically achieved with the present days HP computer capacities.
KeywordsCombustion Vortex Vorticity Travin
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