【摘要】 在计算流体动力学的实际应用中,无反射边界条件是一个重要的研究课题。本文根据时间插值的特征线方法在拉氏框架下构造了拉氏无反射边界条件,并应用在SPH方法中。与拉氏方法在欧拉框架下的特征线方法相比,该方法不需要区分超声速和亚声速流,在来流和出流中也具有相同的形式,因而更加简单易行。数值结果表明,本文的方法在水下爆炸的数值模拟中能够得到较好的结果。更多还原

【Abstract】 In the practical application of computational fluid dynamics,non-reflecting boundary condition is an important research subject. A new kind of Lagrangian non-reflecting boundary condition is constructed in the Lagrangian framework based on the time-line interpolation characteristic method,and is applied in SPH method. Compared with the characteristic method in Euler framework,the proposed method is more simple and easy to implement for the same formulations in inflow and outflow zones without distinguishing the subsonic flow from supersonic flow. The numerical results show that the proposed method is able to meet the need of the numerical simulation in underwater explosion.更多还原