基于HUST-Ship的船舶自航仿真流场特性分析

Study for numerical simulation of ship flow field characteristics under self-propulsion based on HUST-Ship

模型试验中监测船舶周围流动特性需要花费较高的成本,基于数值试验水池的虚拟试验模拟方法能够较为方便地捕捉船舶航行过程中其周围的精细流场特征.本研究基于重叠网格方法实现数值试验水池网格与船模网格的嵌入,形成船舶自航数值试验模型.运用粘性流CFD方法开展船舶航行过程中的流场特性数值仿真工作并进行可靠性验证.不同国际标模在数值试验水池中的试验结果表明,数值预报结果与模型试验结果之间的差别小于3%,且数值试验能够捕捉得到自由液面升高与速度分布云图等流动细节的特征.研究表明,基于数值试验水池的虚拟试验方法无论对船舶宏观水动力性能还是精细流场流动特性都能够实现高精度数值预报.

During the model test,the monitor of the flow characteristics around the ship model requires high cost.However,the flow field characteristics can be captured conveniently in numerical simulation based on the numerical tank.In this study,the overset grid approach was used for the combination between the numerical tank and ship grid to generate the numerical model for the ship free-running test.The viscous computational fluid dynamics(CFD)method was used to simulate the flow field characteristics as the ship model was advancing and the results were validated.The comparisons for the performance of different ships between CFD and experimental results were all less than 3%.What’s more,the CFD method can capture the flow field characteristics such as the free surface flow and the velocity distribution.Overall,the results show good agreement for the prediction of ship hydrodynamic performance and flow characteristics around the ship.