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How to consider groundwater table in soil
Posted Aug 21, 2012, 11:04 p.m. EDT Fluid & Heat, Porous Media Flow, Structural Mechanics Version 4.2a 1 Reply
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Hi I am a beginner of COMSOL, I am trying to use COMSOL to model soil behaviour. As you know the soil always water in it, which make a difference of stress state, can be total stress and effective stress.
When I use Geomechanics model, there is no option for groundwater, do I need the "subsurface flow module" to make for it?
I tried to use "porous material module", but it can not show some specific geomechanics feature, such as soil plasticity, friction angle, cohesion, etc.
thank you
When I use Geomechanics model, there is no option for groundwater, do I need the "subsurface flow module" to make for it?
I tried to use "porous material module", but it can not show some specific geomechanics feature, such as soil plasticity, friction angle, cohesion, etc.
thank you
1 Reply Last Post Aug 22, 2012, 7:30 a.m. EDT
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Posted:
1 decade ago
Hi,
My trial license of geomechanics module has expired and hence cannot appreciate your constraints.
But if you see the need to include changing or static water table or for that matter unsaturated soil, just add your own PDE form equation to include Darcy's or Richard's equation as appropriate. This is very simple. But make sure that in the source term of your flow equation that you have the volumetric strain (solid.evol) as the coupling term of course with appropriate coefficients included. In other words, write down your flow equation with appropriate coupling with strains and code it into the PDE form.
Suresh
My trial license of geomechanics module has expired and hence cannot appreciate your constraints.
But if you see the need to include changing or static water table or for that matter unsaturated soil, just add your own PDE form equation to include Darcy's or Richard's equation as appropriate. This is very simple. But make sure that in the source term of your flow equation that you have the volumetric strain (solid.evol) as the coupling term of course with appropriate coefficients included. In other words, write down your flow equation with appropriate coupling with strains and code it into the PDE form.
Suresh