[Allen_Lin]

here is my problem:there is certain piece of liquid in a horizontal tube,and both ends of the tube is set to be pressure-inlet,one is P*sin(wt) and the other is P*cos(wt).the liquid will oscillate(just like piston) due to the pressure difference.the motion of the liquid is what I want to simulate.I'm thinking of using VOF model or dynamic mesh method to do this,but for VOF model ,how to define the boundary conditions puzzled me;for dynamic mesh method,i don't know the profile of the motion of the liquid.so ,could anybody give me some advices?I really appreciate your help.
Allen