基于势流理论的门桥兴波阻力计算

提出了门桥漕渡水阻力计算，特别是兴波阻力计算的新方法。该方法基于势流理论，考虑门桥的漕波速度和水流速度，通过坐标变换，确定了速度势的适定性条件。并选择合适的格林函数满足除门桥湿表面以外的其他定解条件，则场内的速度势只要由这一格林函数及其法向导数在门桥的湿表面上分布即可决定，大大降低了计算工作量。最后，利用面元法进行数值计算。

Calculation of Wave-making Resistance for Raft Ferrying Based on Potential Flow Theory

In the paper, a new method is introduced of calculating water resistance for raft ferrying, especially calculating wave making resistance. Based on potential flow theory, current velocity and ferrying velocity is considered. Confirmative conditions of the velocity potential are established by means of transforming coordinates. Appropriate Green function which satisfies all confirmative conditions except that on the wet surface of the raft is selected. So the velocity potential is calculated by distributing the Green function and its differential coefficient only on the wet surface of the raft, with calculation workload being reduced largely. Finally, panel method is used to process numerical computation.