Reactive flow in porous media with volume expansion
 

Hi,
I'm going to model gas flow in porous media. Gas reacts with porous solid and volume of porous solid increases. I want to solve the continuity equation for gas and porous solid, Darcy's momentum equation and energy equation. When I have not considered the volume expansion, I have used finite volume method with structure grid, but now, each cell of my grid has spacial volume at each time.
I have an equation for rate of volume expansion and I assumed the expansion occurs only in one dimension.
The attached figure shows may grid. Does anyone have any better idea for this problem?
Does anyone now the best way for discretization of equation on attached grid?
thanks in advance.

try to solve your problem using immersed boundary condition (you may need to write a separate code for this).

Hi misterdd,
Thanks a lot for your replay, I'm going to study about immersed boundary condition.

Hi
This is my first question.Iam simulating a flow over solids(squares).For this I created a domain(big rectangle) with solids squares inside.I have subtracted the square faces from the big rectangular face.I see the big surface getting distorted after I subtract one particular square face.I have easily subtracted all other faces. How to slove this?
:confused: