内孤立波与有航速潜体相互作用数值模拟

Numerical simulation of interaction of internal solitary waves with a moving submarine

基于两层流体中内孤立波的KdV-mKdV理论解,采用速度入口和开管道方法进行内孤立波数值造波与消波,建立了同时具有造波、造流和消波功能的数值波流水槽。利用所建立的数值波流水槽,对内孤立波与有航速潜体相互作用问题进行了数值模拟,计算分析了受力特性。数值结果表明,内孤立波造波结果理想,消波效果显著,在内孤立波流场中有航速潜体将会受到突发性冲击载荷的作用。研究表明,利用所述方法来研究内孤立波与有航速潜体的相互作用是一条有效的途径。

Based on the KdV-mKdV theory for internal solitary waves in a two-layer fluid,a numerical internal-soliton flume which can both generate wave-current and absorb wave is developed by use of the velocity inlet and open channel flow methods.The interaction of internal solitary wave with a moving submerged body is numerically simulated by use of the proposed numerical flume.The force characteristics of the moving body due to internal solitary wave are calculated and analyzed.Results show that the numerical wave-making results are good and the wave-absorbing effects for internal solitary waves are very effective as well.Moreover,the internal solitary waves may give rise to sudden impact loads on the moving body.Results indicate that the presented method can numerically simulate the interaction of internal solitary wave with underwater vehicle.