S052015 A Study on the Improvement of Vortex Methods by vortex reconnection and redistribution models

Abstract

In this study, a grid-free vortex method was developed and applied to various turbulent flows in order to validate the method. The grid-free redistribution model proposed by Fukuda and Kamemoto^<[1,2]> and newly developed vortex elements reconnection model were introduced and the spatial resolution was improved for high strain regions. The calculation was accelerated by using Graphics processing Units (GPUs). From the results, it was confirmed that the unsteady feature of the vorticity region and its development were successfully captured. Furthermore, comparisons of the calculated data with experimental data showed that the method provided an accurate velocity profile of turbulent internal flow and accurate energy spectra of vortex ring interaction.