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    Area of Science:

    • Computational Fluid Dynamics
    • Multiphase Flow Simulation
    • Rigid Body Dynamics

    Background:

    • Simulating rigid body and two-phase fluid dynamics, especially with large density ratios and high Reynolds numbers, is computationally intensive.
    • Traditional Navier-Stokes solvers face numerical diffusion, limiting accuracy in these complex flows.
    • Kinetic lattice Boltzmann methods offer improvements but struggle with accurate fluid-rigid boundary management, leading to inconsistencies.

    Purpose of the Study:

    • To develop a novel kinetic framework for simulating fluid-rigid interaction in two-phase flows.
    • To address limitations in existing methods, particularly concerning boundary conditions and numerical accuracy.
    • To enable more physically consistent and versatile simulations of complex multiphase phenomena.

    Main Methods:

    • Leveraging an overset grid approach within a kinetic framework.
    • Proposing a novel formulation for two-phase flow with enhancements for complex scenarios.
    • Implementing multi-resolution domains with boundary layer control for moving objects.

    Main Results:

    • Successfully resolved issues inherent in previous fluid-rigid interaction methods.
    • Achieved physically consistent simulations of two-phase flow phenomena.
    • Demonstrated quantitative and qualitative improvements over existing techniques.

    Conclusions:

    • The proposed kinetic framework offers a significant advancement in simulating coupled fluid-rigid body dynamics in two-phase flows.
    • The method provides enhanced accuracy, physical consistency, and versatility across various applications.
    • Validated through comparisons and real-world experiments, the framework shows promise for future research and engineering applications.