Application of the FBM model for the computations of cavitation flow around a cascade hydrofoil

The cavitation flow around a cascade hydrofoil was numerical studied with the filter-based turbulence model(FBM) based on the Clark-Y cascade hydrofoil. The Reynolds number and the cavitation number were set according to the water tunnel experiment and the empirical value of the filter size was given based on the largest grid size of the refined region. Through second development, the FBM model was embed in the CFX software. The results demonstrate that the phenomenon of quasi-periodical cavity shedding will occur near the leading part and the trailing part of the cascade hydrofoil, and the shedding period will increase with the decrease of cavitation number; the cavity shedding in both parts can influence the drag acting on the hydrofoil, but the leading part shedding is dominant; with the decrease of cavitation number, the shedding will be gradually limited into the trailing part, and the drag fluctuating will be weaken to a great extent.