采用Rankine源、RANSFS组合方法求解计及波影响的船舶粘性绕流问题

Solving ship viscous flow with wave influence by using Rankine source and combined RANSFS method

本文开发了边界单元(Rankine源)方法与RANSFS方法相组合求解计及船波影响的船舶粘性绕流问题的切合在微机上实施的方法.对S60(Cb＝0.6)船模,在Fn＝0.316, Rn＝106之下进行了计算验证.对边界单元法中Z＝0面上网格的划分,提出了一种不同的网格划分思想,算得了令人满意的波高分布.对这一组合方法的收敛性进行了较为仔细的考察.总阻力系数Ct的计算值,与测量值的相对偏差达到＜5%.对波高的考察显示,粘性对波的影响主要集中在船体表面附近.

This paper develops a method of combining the boundary element(Rankine source)method and RANSFS method to calculate on computer ship's viscous flow with wave influence. Verification is done to a model of S_(60)(C_b=0.6) at Fn=0.316 and R_n=10~6. A new grid division theory is proposed for Z=0 surface grid dividing in boundary element method, which leads to satisfactory wave height distribution. Careful investigation is done to the convergence of this combined method and it is found the relative deviation of the calculated value of total resistance coefficient C_t from the measured value is less than 5%. The wave height observation shows the viscosity influence on wave appears mainly around hull surface.