Hey everyone,
I'm trying to simulate a porous media column that's initially saturated with water, and get's progresively filled with air from the top. For water to move, the driving force is gravity, but in COMSOL there's no possibility of applying either gravity or volume forces to a domain when using this physics package.
Is there a stablished way to implement gravity in this kind of model, either through weak contributions or any other method?
Thanks in advance!
Dear César Rodríguez Pereira,
I agree with Idir Lasloudji. It is possible to use weak contribution to include gravity. In addition, I am not sure about the physics that you use in your simulation but you can also take a look at the following application and discussion to have further ideas:
https://www.comsol.com/model/gravity-and-boundary-conditions-2152
https://www.comsol.com/forum/thread/27959/gravity-effect
Marwan Nafea Thanks for the answer. I added gravity by manually editing some of the equations, directly in equation view, which was a bit easier than the weak contribution for this particular physics, and it worked. The problem I had then was the high non-linearity of the problem I was solving, but fortunately the new version of comsol includes a porous multiphase physics, which handles this problem much better.
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