PIV Measurement of Meandering Channel Flow for Kyokusui-no-En

A ceremony that a few poets sitting alternately on the both banks of a meandering channel are expected to make poems during the limited time when drink-filled cups flow down and finishing poem making, poets pick up cups to drink is called Kyokusui-no-En. This sort of ceremonious game has its origin in ancient China and was introduced to Japan where it prospered in 8th through 11th centuries.In this paper, the channel flow of Kyokusui-no-En is observed from the view point of fluid mechanics. The actual flow was studied using PIV measurement and numerical simulation. According to these results, it was made clear that the meandering channel creates the separate flow, reverse flow and vortices to make the wine cups movement elegant.