船后螺旋桨空泡数值预报及试验对比

文章研究了湍流模型对螺旋桨空泡计算结果的影响，结果表明常用的湍流模型均可较好地预报螺旋桨空泡形态。采用RANS求解器，结合SST k-ω湍流模型和Sauer空化模型，数值模拟了船后螺旋桨空泡。用对称面边界条件处理自由表面，滑移网格技术处理螺旋桨旋转，时间步长为1°。螺旋桨空泡模拟结果与大型循环水槽试验结果进行了对比，虽然由于计算网格稀疏的原因没能捕捉到螺旋桨梢涡空泡，但螺旋桨空泡随空间角度的动态行为与试验观察结果吻合较好。

Numerical Predictions of the Propeller Cavitation behind Ship and Comparison with Experiment

The effects of turbulence model on propeller cavitation simulation results are presented. It shows that the common turbulence model can deal well with the propeller cavitaion shapes. And then the propeller cavitation performance behind ship was numerically simulated using a hextetrahedral mesh based on RANS solver, the Suaer’s cavitation model based on transport equation and a SST k-ωturbulence model were coupled in the RANS solver. A symmetry boundary condition is applied on the top of computational domain instead of the free surface, which is similar to a tunnel ’s wall. To observe the cavitation pattern during the revolution of propeller, the propeller is rotated with a con-stant rotation angle of 1.0 degree using a sliding mesh technique. Cavitation patterns of the simula-tions are compared with the experimental results carried out in Large Cavitation Channel of CSSRC (LCC). Although the predicted propeller tip vortex cavity is missing because of the mesh resolution, the predicted dynamic cavitation behaviors generally well agree with experimental observation.