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Using COMSOL Variables

Posted Apr 18, 2012, 11:21 p.m. EDT Porous Media Flow Version 4.1, Version 4.2, Version 4.2a 2 Replies

ticho
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Hi,

I would like to know how I can use the Effective Saturation and turn it into electrical conductivity/resistivity.

When I compute a subsurface flow module, I get the variable dl.Se for "Effective Saturation".

Now I wish to turn this Se into electrical conductivity by using Archie law. How do I call the variable? I tried using mod1.dl.Se or dl.Se in the material properties but no luck.

Thanks!
Eric
2 Replies Last Post Apr 19, 2012, 1:44 p.m. EDT
Santhosh Kumar CT
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Posted: 1 decade ago Apr 19, 2012, 1:15 a.m. EDT

Hi,

I would like to know how I can use the Effective Saturation and turn it into electrical conductivity/resistivity.

When I compute a subsurface flow module, I get the variable dl.Se for "Effective Saturation".

Now I wish to turn this Se into electrical conductivity by using Archie law. How do I call the variable? I tried using mod1.dl.Se or dl.Se in the material properties but no luck.

Thanks!
Eric


this property should not be given in the material module
Try to use the property value that is present in the physics for the specific domain ...
then COMSOL accepts it.

eg : yi = xi^3/5 + xi^2 where yi being your conductivity and xi being effective saturation and the function being archies law

i guess only the place that you used matters .. !

[QUOTE] Hi, I would like to know how I can use the Effective Saturation and turn it into electrical conductivity/resistivity. When I compute a subsurface flow module, I get the variable dl.Se for "Effective Saturation". Now I wish to turn this Se into electrical conductivity by using Archie law. How do I call the variable? I tried using mod1.dl.Se or dl.Se in the material properties but no luck. Thanks! Eric [/QUOTE] this property should not be given in the material module Try to use the property value that is present in the physics for the specific domain ... then COMSOL accepts it. eg : yi = xi^3/5 + xi^2 where yi being your conductivity and xi being effective saturation and the function being archies law i guess only the place that you used matters .. !
ticho
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Posted: 1 decade ago Apr 19, 2012, 1:44 p.m. EDT
Thank you for your reply Santosh,

But dl.Se is a variable generated by Comsol solver.

Basically, I run the solver for Richard equation, it gives dl.Se

Then I want to run the solver for ACDC while using the values store in dl.Se

Thx in advance
Thank you for your reply Santosh, But dl.Se is a variable generated by Comsol solver. Basically, I run the solver for Richard equation, it gives dl.Se Then I want to run the solver for ACDC while using the values store in dl.Se Thx in advance

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