A Hybrid LBM-FVM Solver for Simulating Multiphase Multi-Component Fluids

Multiphase and multi-component fluid flows are highly intricate, exhibiting dynamic behaviors that challenge conventional simulation methods, especially across a wide range of operating conditions. Adding fluid-solid interactions further escalates this complexity, requiring simulations that are both physically accurate and computationally more tractable. Existing methods often fall short in aspects of either accuracy, efficiency, or stability, and sometimes may also consume excessive memory, rendering them unsuitable for many practical applications. In this paper, we introduce a novel, more practical solution combining a collision-enhanced lattice Boltzmann method with a finite-volume approach. This hybrid solver is designed to effectively simulate multiphase, multi-component flows via the phase-field modeling with a novel wetting boundary treatment in the finite-volume framework, while significantly reducing memory consumption. It enables simulations of multiple fluid phases under varied conditions, capturing rich interfacial behaviors. Additionally, it incorporates an immersed-boundary method to efficiently handle complex fluid-solid interactions. Validation tests confirm that our method produces physically consistent results and demonstrates accuracy across multiple evaluations. We provide comprehensive simulation results, along with comparisons of memory consumption and efficiency, highlighting the practical utility and superiority of our solver over conventional methods.