论文部分内容阅读
提出了一种带推力矢量喷管导弹水下发射的三维流体动力数值模拟方法。三维气流场计算基于贴体坐标下欧拉方程,采用 NND 方法进行数值离散。三维水流场则采用基于势流理论的Hess-Smith面元法。运用混合的欧拉—拉格朗日方法跟踪气、水界面的变化。水流场和气流场的耦合计算通过水气界面处压力和法向速度连续的匹配条件来实现。通过数值实验,研究了燃气泡的三维特征和喷管摆角对流体动力载荷的影响。
A three-dimensional numerical simulation method for launching underwater missile with thrust vector nozzle is proposed. Three-dimensional airflow field is calculated based on the Euler equation of body-fitted coordinates, using NND method for numerical discretization. The three-dimensional flow field uses the Hess-Smith face method based on potential flow theory. Use a hybrid Euler-Lagrange method to track changes in gas and water interfaces. Coupling calculation of water flow field and gas flow field is realized by continuous matching of pressure and normal velocity at the interface of water and gas. Through numerical experiments, the effects of three-dimensional characteristics of bubble and nozzle angle on hydrodynamic loads were studied.