Numerical simulation of wall impinging drops

TL;DRAbstract

In this work, numerical investigations of impinging drops on dry and wet walls are reported. A multiple-relaxation-time (MRT) axisymmetric multiphase lattice-Boltzmann (LB) model is employed along with a model for simulating surface wettability. For simulations on wet walls, a recently developed high density-ratio LB model is employed. This model is extended in this work to include the MRT collision model and thereby achieve Reynolds number which are 50% higher, and adapted to an axisymmetric coordinate system. The model is evaluated by verifying the Laplace-Young relation for a liquid drop and comparing the computed frequency of oscillations of an initially ellipsoidal drop with analytical values. Agreement within 8% is obtained. When the impingement is on dry walls, the outcomes are deposition, rebound and splash. In deposition, the dynamic contact angle evolution during spread and recoil was shown to be influenced by the drop inertia and transient effects of the varying contact line

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