Abstract
In wake galloping of two square prisms of same size, irregular vibrations have been reported to occur in certain configurations. However, the time-varying characteristics of the vibrational displacement have not been clarified in many cases. In this study, we aimed to clarify the relationship between the flow pattern and the increase or decrease of the vibration displacement in local time, and conducted visualization measurements using a water channel and a forced vibration experiment under conditions in which irregular vibrations occur. As a result, it was confirmed that there are flow conditions in which one period of vibration does not correspond to one period of flow pattern, and that there are differences in the vortices formed by large and small displacements.
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