Adaptive near-contact repulsion in conservative Allen–Cahn phase-field lattice Boltzmann multiphase model
Andrea Montessori, Maria Rosa Lisboa, Marco Lauricella, Sauro Succi
Source abstract
Abstract Unresolved thin-film dynamics often causes spurious coalescence in diffuse-interface simulations of multiphase flows. We address this issue by introducing a fully local repulsive near-contact flux in a conservative Allen–Cahn phase-field model coupled to lattice Boltzmann hydrodynamics. The interaction activates only for nearby interfaces with opposite orientations, with a strength that self-adjusts according to a closed-form phase-field-based indicator of local interface proximity. The resulting method avoids nonlocal geometric procedures, retains computational efficiency, and is well suited to massively parallel implementations. Tests on collision benchmarks and three-dimensional bubble swarms demonstrate robust suppression of artificial merging and physically consistent near-contact dynamics.
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