My problem description:
I'm trying to solve the problem about the interface between water and air in a microchannel.
Bubble is stayed at the cavity and water is injected through the inlet.
Surface tension force is dominant rather than inertia and viscous forces.
Inlet velocity is 0.01 m/s.
However, The numerical results show that the spurious velocity of 0.2 m/s at the interface near the wall.
Please see the attached *.cas and *.dat files.
1) zoomed area (vectors of velocity components)
2) entire domain (contours of velocity magnitude)
First, why a (non-physical) spurious current is observed when using the VOF method.
Second, how to reduce this spurious currents?