Speaker
Description
Dynamic wetting poses a fundamental modeling challenge because the motion of a material contact line requires slip at the solid wall and a consistent coupling between contact-line kinematics, wall stresses, and the dynamic contact angle. After briefly reviewing these modeling constraints, we present the contact-region generalized Navier boundary condition (CR-GNBC). The model replaces the singular uncompensated Young stress at the contact line by a smooth distribution over a finite contact region, whose width is treated as a physical parameter independent of the computational mesh. The resulting sharp-interface formulation is consistent with the kinematic evolution of the contact angle and avoids prescribing the dynamic angle through an empirical contact-line velocity law.
On the numerical side, we discuss the main ingredients required for direct simulations of wetting processes within sharp-interface finite-volume approaches. Particular attention is given to the accurate representation and transport of the interface and contact line, the numerical treatment of wall and contact-line conditions, and the verification of mesh-independent solutions. Representative simulations illustrate the regularizing effect of the CR-GNBC and its potential for predictive numerical modeling of dynamic wetting.