Discussion Forum

Hello - I have a question regarding the use of the Level Set Method for Two Phase flow in COMSOL 4.3? I have included a figure to explain the question. I have a flow domain with two fluids (called fluid 1 and fluid 2). I have a bubble of fluid 2 inside of a fluid 1 domain near a free surface of a fluid 2 domain. My goal is to figure out how the distance h of fluid 1 between the bubble and the moving free surface changes as I inject fluid 1 from the bottom into the domain as shown? It is complicated, because with time fluid 1 is injected from the bottom and this moves the bubble and the free surface upward away their initial positions (i.e. gives me trouble with probes). I want to track h relative to the moving bubble and free surface. One way I attempted this was to integrate the volume fraction of fluid 1 along the center line with a probe boundary tool. The problem with this is that it gives me the fluid 1 thickness not only ahead of the bubble but behind it as well. I just want the thickness of fluid 1 in front of bubble. Any assistance would be greatly appreciated.