Experimental study on the effect of the secondary vortex at trailing edge on response characteristics of the motion-induced vortex vibration for specific cross sections

抄録

In general, motion-induced vortex vibration is considered to be caused by the unification of the separated vortex from leading edge and the secondary vortex at trailing edge. However, the results of wind tunnel tests for rectangular cylinders have revealed that the secondary vortex at trailing edge is not necessary for the generation of motion-induced vortex vibration. In this study, two kinds of cross sections where the secondary vortex at trailing edge is considered less likely to occur were selected as the target cross sections. Wind tunnel tests were conducted in order to give a further explanation of the effect of secondary vortex at trailing edge on the motion-induced vortex vibration at the wind velocity region where larger response amplitude occurs. As a result, the secondary vortex at trailing edge is not necessary not only for the onset of the motion-induced vortex vibration, but also at wind velocities where larger response amplitude occurs.