|November 15, 2014, 05:03||
Instable interface: capillary force driven imbibition of water in a porous domain
Join Date: Nov 2014
Posts: 7Rep Power: 4
I'm trying to model the imbibition of water in a porous domain. Therefore I set up a simple "1D" model.
My geometry has the following dimensions: 5x5x25 mm, the mesh consists of 1000 stacked cells with symmertries to left+right, front+back, an inlet at the bottom and an opening on the top.
The pressure drop in the porous domain is modelled by setting the appropriate permeabilty. In addition to that I configured a subdomain to model the capillary and the gravity force. Both are take into account as a bulk source by the following term in z-direction:
g*density -C [N/m^2]*WATER.vfs.grad z
The simulation works fine for a few thousand iterations. After that I get a verry blurred asymmetric interface (before the interface gets blurry the pressure field becomes asymmetric):
Detailed view with visible mesh.
I already tried various settings without success:
How is it even possible to get this kind of asymmetry in a "1D" mesh?
I would appreciate any kind of help. Thanks!
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