Non-axisymmetric dynamic, shock wave, and liquid jet characteristics of cavitation bubble near two intersecting walls

In this study, a three-dimensional compressible multiphase volume-of-fluid model that incorporates phase change, thermal effects, and adaptive mesh refinement is developed and employed to simulate the non-axisymmetric dynamics of a bubble near two intersecting walls. The model is validated against experimental data for bubble evolution near both a single wall and two intersecting walls. Results reveal that the presence of two intersecting walls induces pronounced asymmetry in bubble collapse, with the liquid jet directed toward the corner. Depending on the combination of γ1 and γ2, three distinct dynamic regimes (Types I, II, and III) are identified, characterized by differences in jet-axis migration and bubble non-axisymmetric dynamic. Shock-wave attenuation along the walls follows power-law decay, with exponents varying according to standoff distance and reflection patterns. The Rayleigh collapse time is prolonged compared with the single-wall case, and a modified prolongation factor is proposed to account for the additional wall influence. Wall pressure peaks reach a minimum near γ2 ≈ 1.0 at fixed γ1, while liquid-jet velocity exhibits an opposite trend. Significant thermal loading on the wall occurs only when γ2 < 1.0, with peak wall temperature increasing as the bubble approaches the corner.