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No-homogeneous initial condition
Posted 03.12.2014, 22:26 GMT-5 Chemical Reaction Engineering Version 5.0 6 Replies
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I am trying to build a mass transport model that has a higher solute concentration in a region than in other of the same domain.
Is this possible in COMSOL? How?
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It is possible. Either you use a function to define an initial distribution or split your domain into smaller ones having varying initial concentrations. No boundary conditions are needed at the internal boundaries.
br
Lasse
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And how can I do that?
I am a new COMSOL user, so I will be very thankful if you told me how to do that.
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My system consists in a membrane that is charged with a solute, but it is not homogeneous. The solute concentration is higher near to the surface than inside the membrane.
So, I built a 1D model and I want changes in concentration along the interval. Maybe, a linear way could be useful.
Thank you!
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Let's say that you membrane has a thickness H and the maximum concentration in the membrane is Cmax, and minimum concentration is Cmin. If you wish, e.g. a parabolic distribution in the membrane, make an initial concentration
4*(Cmax-Cmin)*(x/H)*(x/H - 1) + Cmax
which is Cmin at x = H/2 and Cmax at x = 0 and x = H
Or whatever you wish to depict your initial distribution.
br
Lasse
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It works perfectly! :)