基于CFD的三体船流场数值模拟可靠性研究

Research on reliability of fluidity numerical simulation for trimaran vessel under the CFD

在Realizable k-ε湍流模式下对某高速三体船模型的黏性流场进行CFD数值模拟.不同航速下阻力的计算结果与试验数据最大误差为15.05%.分析得到三体船模型在不同航速下的自由面波形,显示出主侧体之间强烈的兴波干扰.最后计算不同航速下三体船模型的压力分布,较为理想地模拟出由于球鼻艏存在而导致的高压区,以及侧体内外两侧由于自由面高度不同而引起的压力分布的不同.结果表明:CFD数值模拟三体船黏性流场具备一定的可靠性.

The Realizable be model was adopted to conduct the numerical simulation by the CFD for the viscous flow fields of the trimaran. The maximal error between the calculation results and the ex- perimental data was 15.05%. Then the forms of wave on the free surface were provided by the simu- lation and an analysis, and the wave making interfere was also precisely presented in the graphs. At last, the distribution of pressure on the model of trimaran under the different velocity was calculated, and the dynamic pressure on both the main body and the lateral body were given, and the high pressure area was rationally simulated. The research results show that, the numerical simulation of vis- cous flow fields about trimaran under the CFD is reliable.