一种舰船流场特性计算方法研究

A Method of Ship Flow Field Numerical Calculation

以DTMB5415为研究对象,采用RANS方法结合VOF模型,研究了网格因素以及湍流模型对阻力、波形和流场预报精度的影响。首先设计了粗糙、中等和精细共三套网格,分别进行兴波流场计算,通过比较试验测试的阻力和波形数据,确定中等网格划分方式既能保证计算的准确性又能保持较高的计算效率。其次选择三种湍流模型,对总阻力及舷侧波高进行数值计算,SST k-ω湍流模型在保证计算效率的情况下可满足计算精度要求。最后采用中等网格划分以及SST k-ω模型进行计算,并同试验测量结果进行比对,结果表明船侧表面附近数值计算波形分布与试验结果基本一致。

The influence of grid division and turbulent model to resistance,wave ship and precision of flow prediction has been investigated by selecting ship model DTMB5415 as calculated object and using RANS method and VOF model.First,coarseness,middle and huge grid division have been designed to calculate wave flow field.By comparing resistance and wave ship date of the test with calculating data,the results show that middle count grid divisions can obtain veracity of calculate results and higher calculate efficiency.Second,three turbulent flow models have been used to compute total resistance and ship wave.The SST k-ω turbulent flow model can satisfy calculated results accuracy under high calculate rate.Finally,middle grid division and SST k-ω turbulent flow model have been selected to calculated ship wave.The results showed that the calculated results have been agreed with the experiment data.