On a dynamic wetting model for the finite-density multiphase lattice Boltzmann method

The contact line problem, where a liquid/fluid interface moves relative to a solid boundary (either slipping or spreading), is an important feature of many engineering and naturally occurring free-surface flows. This paper discusses the current state-of-the-art in applying wetting line models to computational fluid dynamics simulations and contrasts and compares it with a new wetting model (based on one physical parameter, notably the solid boundary surface affinity) for the finite-density multiphase lattice Boltzmann method (LBM). Results of two-dimensional filament (natural and forced) spreading flows over different types of surfaces are presented to illustrate the capability and drawbacks of the new dynamic wetting model for the finite-density multiphase LBM.