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Dynamic wetting plays an important role in the physics of multiphase flow,and has significant influence on many industrial and geotechnical applications.In this work, a modified smoothed particle hydrodynamics (SPH) model isemployed to simulate surface tension, contact angle, and dynamic wettingeffects. The wetting and dewetting phenomena are simulated in a capillary tube,where the liquid particles are raised or withdrawn by a shifting substrate. TheSPH model is modified by introducing a newly-developed viscous forceformulation at liquid-solid interface to reproduce the rate-dependent behaviourof moving contact line. Dynamic contact angle simulations with interfacialviscous force are conducted to verify the effectiveness and accuracy of thisnew formulation. In addition, the influence of interfacial viscous force withdifferent magnitude on contact angle dynamics is examined by empirical powerlaw correlations, and the derived constants suggest the dynamic contact anglechanges monotonically with interfacial viscous force. The simulation resultsare consistent with the experimental observations and theoretical predictions,implying that the interfacial viscous force can be associated with slip lengthof flow and microscopic surface roughness. This work has demonstrated that themodified SPH model can successfully account for the rate-dependent effects ofmoving contact line, and can be used for realistic multiphase flow simulationunder dynamic conditions.

A Modified Smoothed Particle Hydrodynamics Approach for Modelling Dynamic Contact Angle Hysteresis