Study on the relation between secondary vortex at trailing edge and motion-induced vortex vibration in heaving mode for rectangular cross sections with side ratios of B/D=0.50-6.0

Abstract

In general, motion-induced vortex vibration is considered to be caused by the unification of separated vortex from leading edge and secondary vortex at trailing edge. However, the results of wind tunnel tests for the cross sections with side ratios of 1.18 reveal that motion-induced vortex in heaving mode might occur without the formation of secondary vortex at trailing edge. Therefore, in order to clarify the relation between secondary vortex at trailing edge and the generation of motion- induced vortex vibration, spring-supported and flow visualization tests for rectangular cross sections with side ratios of 0.50-6.0 were conducted. It was found that the stable shedding of secondary vortex at trailing edge is not necessary condition of the generation of motion-induced vortex vibration in heaving mode.