A GRID-FREE REDISTRIBUTION MODEL FOR A VORTEX METHOD AND TURBULENT FLOW ANALYSIS

摘要

This paper presents a new grid-free type of redistribution model for turbulent flow analysis, in which each vortex particle is redistributed into some elements in accordance with its stretching rate, The model is applied to an inclined collision of two vortex rings. Energy spectra are analyzed and compared with existing DNS data and results of experiments by Saddoughi & Veeravalli (1994). The energy cascade and dissipation process are reasonably simulated. In addition, the LES model proposed by Kiya & Izawa (199) is applied to the proposed the LES model proposed redistribution model. The results show that the analyzed energy spectra are in close agreement with the existing DNS data up to high wave number region.