Random flow generation technique for Large Eddy Simulations and particle-dynamics modeling

A random flow generation (RFG) technique is presented, which can be used fo r initial/inlet boundary generation in LES (Large-Eddy-Simulations) or part icle tracking in LES/RANS (Reynolds-Averaged Navier-Stokes) computations of turbulent flows. The technique is based on previous methods of synthesizin g divergence-free vector fields from a sample of Fourier harmonics and allo ws to generate non-homogeneous anisotropic flow field representing turbulen t velocity fluctuations. It was validated on the cases of boundary layer an d flat plate flows. Applications of the technique to LES and particle track ing are considered.