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Domain-dependent material properties?
Posted 5 juin 2014, 12:31 UTC−4 Fluid & Heat, Microfluidics, Modeling Tools & Definitions, Parameters, Variables, & Functions Version 4.3 1 Reply
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Hi I am trying to simplify a 3D-->2D model for a creep flow/ transport problem.
I have a screenshot of part of the model attached.
What I am trying to do is to define the material (water) dynamic viscosity to be one value in the red colored domain (and the grey bulk in the center), and to be another value in the blue colored domain. The blue domain is actually about 350 tiny connection ports from the outside-in that would simulate a variable thickness that I can't capture in 2D.
If I set the material property expression to "u", and define two model variables to be "u" in the <red domain> and "u" in the <blue domain> I return with an error of duplicate variables.
Is there a way to do this? I am running COMSOL 4.3
I have a screenshot of part of the model attached.
What I am trying to do is to define the material (water) dynamic viscosity to be one value in the red colored domain (and the grey bulk in the center), and to be another value in the blue colored domain. The blue domain is actually about 350 tiny connection ports from the outside-in that would simulate a variable thickness that I can't capture in 2D.
If I set the material property expression to "u", and define two model variables to be "u" in the <red domain> and "u" in the <blue domain> I return with an error of duplicate variables.
Is there a way to do this? I am running COMSOL 4.3
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1 Reply Last Post 6 juin 2014, 05:30 UTC−4
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Posted:
1 decade ago
Hi,
You may have not selected the geometric entity level correctly for the variable u. You need to create two variables node, with each variable having relevant geometric entity level.
Or another problem could be that 'u' is the name of a dependent variable, I mean 'u' could be defined as x displacement or pressure or concentration or whatever by default by COMSOL. Try renaming u.
Suresh
You may have not selected the geometric entity level correctly for the variable u. You need to create two variables node, with each variable having relevant geometric entity level.
Or another problem could be that 'u' is the name of a dependent variable, I mean 'u' could be defined as x displacement or pressure or concentration or whatever by default by COMSOL. Try renaming u.
Suresh