方尾船绕射问题RANS求解研究

摘要

基于RANS方程，采用VOF方法捕捉自由液面，通过自定义函数UDF在Fluent平台上建立了三维数值波浪水池，模拟了规则波的生成、传播和消波，发现波陡对数值造波的精度有较大影响。求解了规则波中顶浪航行的方尾船模型的波浪力，并与试验结果和势流理论结果进行了比较。结果表明，基于RANS方程的波浪力计算结果与试验结果和势流理论结果吻合良好，在长波中与试验值更接近。%Based on an unsteady RANS approach and Volume of Fluid (VOF) method, a numerical wave tank was established by utilizing the User Defined Function (UDF) on FLUENT. Wave generat-ing, propagating and damping were simulated and verified. Wave forces of a complex hull model with bulbous bow and transom stern were computed in head waves. It is found that the wave steepness has a significant effect on the accuracy of numerical wave. Comparison of the results acquired from the present method, experiment and potential theory illustrates that the wave forces are in agreement, while the RANS method provides slightly better prediction in the long waves.