Numerical Investigation on Hydrodynamic Characteristics of a Tunneled Planing Hull in Calm Water

槽道滑行艇水动力特性的数值研究

A tunneled planing hull has unique hybrid hydrodynamic and aerodynamic characteristics due to the presence of a tunnel.In this paper,experimental and numerical investigations on hydrody namic analysis of a tunneled planing hull are carried out.The resistance tests of models with three dif ferent masses(127.4 kg,159.5 kg,202.9 kg)are conducted for the Froude number in the range of 0.761≤Fn≤1.925.The results of resistance measured by towing tank imply that the tunneled planing hull with a larger displacement has a superior resistance performance.The numerical simulation of Reynolds Average Navier Stokes(RANS)equations based on the finite volume method is performed to analyze the hull characteristics in calm water(M=159.5 kg)with two degrees of freedom(sinkage and trim).The numerical results are compared with the experimental data,which shows good agreement.Pressure distribution,wave profiles and lift forces obtained by SST k-ωand Realizable k-εturbulence models are compared and discussed.Finally,the local fluid flow of streamline around the hull can be divided into four regions due to the presence of a tunnel,which is different from the behaviors of the conventional planing monohull with prismatic form.

由于槽道的存在,槽道滑行艇具有独特的流体动力学和空气动力学特性。本文对槽道滑行艇的水动力特性进行了试验和数值研究。在0.761≤Fn≤1.925范围内,分别进行了质量为127.4 kg、159.5 kg和202.9 kg的船模阻力试验。拖曳水池的阻力试验结果表明,排水量较大的槽道滑行艇阻力性能优越。采用基于有限体积法的雷诺平均纳维斯托克斯(RANS)方程进行数值模拟,以分析船体在静水中具有两个自由度(升沉和纵摇)的阻力特性(M=159.5 kg)。数值结果与试验数据的比较显示出良好的一致性。比较和讨论了由SST k-ω与Realizable k-ε两种湍流模型的数值模拟获得的压力分布、波形和升力。由于槽道的存在,船体周围流线的局部流体流动可以分为四个区域,这与传统的棱柱型滑行艇的表现不同。