竜巻内の物体に作用する非定常力

Abstract

In the present paper, we assume the swirling motion of tatsumaki as the Rankine vortex moving with a constant velocity and analyze the unsteady horizontal flow at any point in the tatsumaki path.The inertial force on bodies due to the action of unstady/ accelerating flow is obtained by using the velocity potential for inviscid flow. The inertial force and the drag which is dependent on the square of the fluid velocity may be combined with the Morison's equation, which constitutes the total fluid force.The results are discussed and examined, comparing to the steady-state wind loadings with a constant velocity.