基于二维砰击模型的滑行艇水动力求解及应用

Simulation and application of hydrodynamics of planing crafts based on 2-D water entry model

针对高速滑行艇水动力求解非常困难的问题,通过引入高速、细长体条件,将滑行艇静水中滑行时复杂的三维流固相互作用问题简化成二维剖面入水问题.提出一种计及流动分离的扩展MLM(改进的Logvinovich模型)计算模型,可快速、准确地求解二维剖面入水力,并将其结合二维半理论应用于滑行艇水动升力的求解、静水滑行姿态的预报及海豚运动临界条件的计算.计算结果与试验值及其他数值方法结果比较一致,表明基于扩展MLM砰击模型求解滑行艇水动力的方法是有效的.

By assuming that a planing craft was taken as a slender body and was driven high-speedfully in calm water, complicated 3D fluid mechanic problem of a planing crafts in calm water was simplified to 2D section water entry one. Considering the flow separation at chine, an efficient simulation model （extended modified Logvinovich model） for the section water entry force was presented, which could be applied to simulations of hydrodynamic lift force, planing at itude and critical condition of porpoising with the combination of 2D＋t theory. The results were validated by the experimental data and other simulation. It is shown that this model is an effective method, and can be applied to hydrodynamic problem of planing craft with high speed in waves.