基于自适应网格技术的Clark-Y水翼空泡数值模拟

Numerical simulation of cavitation around Clark-Y hydrofoil based on adaptive mesh refinement

空化流动具有高度非定常性,界面模糊而且处于不断地形变之中。该研究基于开源的CFD平台OpenFOAM,利用interPhaseChangeDyMFoam求解器对Clark-Y水翼的空泡流进行数值模拟,并利用自适应网格技术对空化区域尤其是两相界面附近的网格进行了局部加密,考察并分析了水翼的水动力性能和空泡形态。文中将模拟结果与试验结果相比较,发现通过自适应网格加密可以有效捕捉空泡形态的变化尤其是片空泡脱落过程和云空泡溃灭过程。研究表明,针对空化区域的自适应网格加密能够在计算量一定的情况下有效提高空泡流模拟精度。

The cavitation flow is highly unsteady, and the interface is blurred and constantly deformed. Based on the open source CFD platform OpenFOAM, in present study the interPhaseChangeDyMFoam solver is used to numerically simulate the cavitation flow of the Clark-Y hydrofoil, and the adaptive grid technique is used to localize the cavitation region, especially the mesh near the two-phase interface. Investigation and analysis of the hydrodynamic performance and cavitation morphology of the hydrofoil are carried out. Comparing the simulation results with the experimental results, it is found that the adaptive mesh refinement can effectively capture the change of cavitation morphology, especially the cavitation shedding process and cavity bubbles breaking process. Research shows that adaptive mesh refinement for cavitation regions can effectively improve the simulation accuracy of cavitation flow with a certain amount of computation.