Abstract
Recently we have enjoyed the sport "Ultimate" using flying disc in the world. The flying discs used in this competition are not made in Japan. Therefore, it is expected to develop an inexpensive and highly efficient flying disc of Ultimate. In this research, we visualized the flow fields by 2D-PIV measurement experiment and CFD analysis to understand the phenomena of flow around spinning and non-spinning flying disc. Compared with these results, the flow field of the calculation agreed with that of the experiment qualitatively. Therefore it was shown that analysis of the flow field was reasonable. In addition, the wingtip vortices arose from the flying disc and we could observe that two wingtip vortices arising from spinning flying disc were asymmetric.
