Vortex particle intensified large eddy simulation - VπLES
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This paper presents a novel Large Eddy Simulation approach with a direct resolution of the subgrid motion of ﬁne concentrated vortices. The method, proposed ﬁrst by , 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. Algorith- mic aspects speciﬁc for three dimensional ﬂow simulations are discussed. Validity and advantages of the new approach are illustrated for a well tried benchmark test of the decaying homogeneous isotropic turbulence using the experimental data of  and free turbulent jet ﬂow using experiments of [8, 2, 15].