Abstract
The present study investigated the two-phase immiscible Couette flow in which a lower smooth or rough plate is stationary and an upper plate is moving, using the hybrid method which combines the simulation using the lattice Boltzmann method in the bulk region with the molecular dynamics simulation near the lower smooth or rough surface. The computational time required using the hybrid method was compared with that using the full molecular dynamics simulation, showing big savings in the computational time required by using the hybrid method. The boundary conditions formed on the lower surface depend on the surface energy, viscosity ratio and the geometry of the lower plate, resulting in the slip, no-slip and locking boundary conditions. The results corresponding to the case of the rough surface were compared with those for the smooth surface in order to investigate the effect of the roughness on the flow behavior on the lower plate.
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