摘要
This paper describes the unsteady pressure evaluation on an oscillating bluff body using the unsteady Bernoulli's formula. Flow around a body is simulated by the vortex method. A 2-D rectangular cross section is forced to keep heaving oscillation at reduced wind velocity U/fD = 5. According to wind tunnel experiments, the movement-induced-type vortex-induced oscillation is observed in this cross section at the focused reduced wind velocity region. And the unsteady pressure on the body side surface is known to show convection nature due to the movement-induced vortices which generate at the leading edge and travel towards the trailing edge in exactly one natural period. In this study, this pressure convection on the side surface is focused and its reproduction using vortex method is investigated. The contribution of each term which is part of the time varying rate of the velocity potential is discussed. It is concluded that the term relating to the shedding vortex movement plays the most important role in giving reliable pressure convection nature.