迎角0度のベアシャフト矢を過ぎる流れの数値計算

抄録

The flow past an archery bare shaft arrow is investigated at the angle of attack 0 degree, by using two kinds of finite difference code: an axisymmetric code with fourth-other accuracy in both space and time, and a 3D code with spatial second-order accuracy and temporal second-order accuracy. The Reynolds number, Re, based on the arrow shaft diameter is varied between 10,000 and 20,000, and the length of the shaft is chosen as 120. The grid dependency of the computed velocity field, the value of drag coefficient Cd, boundary layer thickness are studied. The result of comparison and assessment of numerical errors confirms that the computed velocity field is acceptable for the purpose of analysing the stability properties of the boundary lager flow along the arrow shaft.