潜艇PMM实验的CFD仿真技术研究

Study of the CFD approach to simulate PMM experiments of submarine

操纵性是现代潜艇最重要的总体性能之一。为预报潜艇的操纵性能,需求得所有的水动力导数。借助CFD技术和动网格技术数值模拟小振幅平面运动机构试验,求解了SUBOFF主艇体的水动力导数,并与混合分布法计算的附加质量项作了比较,二者符合良好,从而验证了方法的有效性。流场的求解基于RANS方程和RNGk-ε湍流模型,动网格的处理采用Hrvoje Jasak和Zeljko Tukovic的方法,压力和速度的耦合采用PIMPLE方法解耦。流场的控制方程采用有限体积法离散且分离式求解,网格运动的控制方程采用有限元方法离散,网格的分裂采用体和面同时分裂法。

Maneuverability is one of the most important modern marine performances. In order to predict marine＇s maneuverability performance, it is necessary to get marine＇s hydrodynamic derivatives in advance. Simulate numerically the PMM experiment by CFD and moving mesh techniques and calculate the hydrodynamic derivatives of main body of SUBOFF. We also compare the partial results with panel method＇s results,which show that there is a high level confidence, so this approach is potential to calculate the hydrodynamic derivatives of objects with more complex geometry in some extent. The solutions of flow field is based on RANS equations and RNG κ-ε turbulence model,and disposes the moving mesh by the approach proposed by Hrvoje Jasak and Zeljko Tukovic,and deeouple the velocity and pressure with PIMPLE method. The control equations of flow and moving mesh are solved by finite volume method and finite element method respectively. A cell is decomposed by cell-and-face split.