基于CFD数值模拟和模型试验的三体船片体位置优化

Optimization of Side Hull Position for Trimaran Based on CFD Numerical Simulation and Model Test

论文采用低精度CFD数值计算和高精度模型试验相结合的方法,以总阻力为目标,对Fr=0.27速度工况下的某型三体船的片体位置进行优化。利用拖曳水池对不同片体位置的三体船进行模型试验,获得三体船在不同片体位置下的总阻力性能。使用自主开发的CFD黏流数值求解器naoe-FOAM-SJTU对一定范围内的其他片体位置进行水动力数值计算。根据模型试验和数值计算结果,使用自主开发的船型优化软件OPTShip-SJTU对三体船的片体位置进行优化。通过模型试验与数值方法相结合的方式构建Co-Kriging近似模型,并使所构建的模型融合模型试验的信息,以保证优化结果的可靠性。结果显示,沿船长方向不同的片体位置对三体船总阻力的影响有着明显的变化规律。

In this paper, we use a combination of low-precision CFD numerical calculations and high-precision model tests to optimize side hull positions of a trimaran at Fr = 0.27 with the total resistance as the target.Model tests are conducted for three hull positions of the trimaran in a towing tank. The in-house CFD viscous flow numerical solver naoe-FOAM-SJTU was used to perform numerical hydrodynamic calculations for other side hull positions. Based on the model test results and numerical calculation results, the trimaran side hull positions are optimized using software OPTShip-SJTU. The Co-Kriging approximation model is constructed, which ensures the reliability of the optimization results. The results show that total resistance of the trimaran with different side positions appears distinct variation pattern in the longitudinal direction.