Vπles- vortex particle intensified large eddy simulation

This paper presents the progress in the development of a novel numerical technique which utilizes the combination of grid based and grid free computational methods. This novel Large Eddy Simulation approach with a direct resolution of the subgrid motion of fine concen- trated vortices. The method, proposed first by [10], is based on combination of a grid based and the grid free computational vortex particle (VPM) methods. The large scale flow structures are simulated on the grid whereas the concentrated structures are modeled using VPM. Due to this combination the advantages of both methods are strengthened whereas the disadvantages are diminished. The procedure of the separation of small concentrated vortices from the large scale ones is based on LES filtering idea. The flow dynamics is governed by two coupled transport equations taking two-way interaction between large and fine structures into account. The fine structures are mapped back to the grid if their size grows due to diffusion. Algorithmic aspects specific for three dimensional flow simulations are discussed. Validity and advantages of the new approach were illustrated for a well tried benchmark test of the decaying homogeneous isotropic turbulence and turbulent free jet flow. The aim of this paper is to present some new results on the possibility of the model reduction and explanation of the anisotropy of fine scale vortices