A CLSVOF method for simulating bubble motion in ultrasonic fields near a deformable solid cell

초록

An extended coupled level-set and volume-of-fluid (CLSVOF) method is developed for capturing compressible multiphase flow behavior induced by ultrasonic excitation, incorporating viscoelastic solid deformation effects. The proposed model ensures accurate mass conservation for compressible bubbles by introducing a mass-conservative formulation and effectively captures solid deformation by employing a fully Eulerian approach under axisymmetric coordinate system. The accuracy of the proposed method was verified through a series of benchmark tests, demonstrating close consistency with the reference results. Ultrasound-driven single-bubble growth and collapse were simulated, and the numerical predictions were validated against the Keller–Miksis analytical solution. The numerical model was also applied to investigate two-bubble dynamics, exhibiting mirror-like symmetric flow fields analogous to bubble–wall interactions. In both single- and two-bubble simulations, the results demonstrated excellent mass conservation throughout the entire simulation process. Finally, the CLSVOF method was applied to simulate ultrasound-driven bubble motion near a viscoelastic spherical solid cell. A parametric analysis was performed by varying the initial surface-to-surface distance and elastic shear modulus to evaluate their impact on bubble–cell interactions. Highlights •A mass-conservative CLSVOF method for compressible multiphase flow is developed.•The model is evaluated through various benchmark tests for accuracy and robustness.•Ultrasonic single-/two-bubble motion reveals excellent mass-conserving properties.•Ultrasonic bubble motion near a viscoelastic spherical cell is successfully simulated.•Effects of surface-to-surface distance and shear modulus are systematically studied.

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