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The presence of dissolved gases (DG) has a significant impact on fuel cavitation. This study employs dissolved oxygen (DO) as a representative DG species and develops a numerical framework that couple...s the SS-DG cavitation model with Large Eddy Simulation (LES). The framework is applied to investigate the three-dimensional cavitating flow around a Clark Y–11.7% hydrofoil with a narrow tip clearance and is validated against experimental data. The transport mechanisms of DG—including convection, diffusion, dissolution, and precipitation—are systematically examined. Single-bubble analysis demonstrates that non-condensable gas (NCG) impedes bubble collapse and stabilizes bubbles at finite radii through its resistance effect. Additionally, the analysis further reveals that gaseous cavitation can take place when the local pressure exceeds the vapor pressure but remains below the internal bubble pressure, a phenomenon that cannot be captured by conventional vapor-only cavitation models. Unsteady analysis of the cavitating flow reveals that increasing the DO concentration raises the dominant cavitation frequency by approximately 36%, while reducing lift and drag fluctuations by about 32% and 31%, respectively, resulting in a more stable cavitation regime. Furthermore, DO diffusion increases the relative concentration throughout the cavitation zone, with the highest enrichment occurring near the suction surface under HighDO conditions due to gas accumulation within the boundary layer. Overall, the results highlight that DG influences cavitating flows primarily through cumulative transport processes acting over multiple cavitation cycles rather than through instantaneous modifications of cavity dynamics.続きを見る
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