Discussion Forum

Hi,


I do not know how it is in 5.2, but in 4.4 I had to build a separate poroelasticity for multiphase (air and water). This was not difficult because I just coupled Richard's equation with linear elasticity and made some adjustments to the source term.


Suresh

Thank you very much Suresh. I was thinking about create two different Poroelasticity physics, one for the wetting phase and one for the non-wetting phase. Do you think this could be ok?

Hi Giulia,


Sorry, I do not have any background with reservoir geomechanics to comment on your idea.

What I was referring to in my earlier mail was that when you have a soil multiphase system, i.e. air and water, one can possibly use the empirical constitutive law such as Bishop and Blight, which includes both pore air and pore water pressure included in the stress-strain relationship. There is a parameter in the Bishop and Blight that depends on the degree of saturation of the water phase. Therefore, if you just have one equation for unsaturated flow and the other for linear elasticity, you can easily build Poroelastic model in COMSOL. Thus the manner in which the two phase system was considered is through a known consitutive law form literature. So if you have something similar or in fact whatever is the form of constitutive law, you can build it in COMSOL. If you have difficulty, then COMSOL support are very co-operative to help you with the process of building. I have personally gained a lot from seeking their help.


Suresh

Thank you very much for your help Suresh. I'll try to figure it out

Hi Suresh, I was wondering if you have any COMSOL file (like .mph file) with the two physics implemented, because I tried to couple the Structural Mechanics with the Richard's law but I couldn't do it.

Thank you very much for your help

Giulia

Hi Guilia,

Have you solved this problem? I also want to do some simulation with the "Poroelasiticity interface" and two phases flow (gas and water).