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diffusion equation

Posted 2012/01/12 16:05 GMT-5 Fluid & Heat, Heat Transfer & Phase Change, Modeling Tools & Definitions, Parameters, Variables, & Functions, Studies & Solvers 2 Replies

Nina Obvintseva
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Hello everyone!
I need to solve a time dependant one-dimentional diffusion equation on a finite interval. Is it possible to alter comsol's internal diffusion equation to add one more term to it in order for a value of the concentration gradient, that is calculated on one of the interval's edges, to be added to it at every point during calculation process?
Thanks
2 Replies Last Post 2012/01/16 16:14 GMT-5
Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 2012/01/13 2:30 GMT-5
Hi

with comol you can edit the proposed equations, or write everything yourself with the PDE and ODE "physics", check the doc

--
Good luck
Ivar
Hi with comol you can edit the proposed equations, or write everything yourself with the PDE and ODE "physics", check the doc -- Good luck Ivar
Nina Obvintseva
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Posted: 1 decade ago 2012/01/16 16:14 GMT-5

Hi

with comol you can edit the proposed equations, or write everything yourself with the PDE and ODE "physics", check the doc

--
Good luck
Ivar



Hi Ivar,
I understand that I can change the view of an equation. But how can I reflect in the equation that the derivative must be computed precisely on one of the boundaries at each period of time?
Thank you in advance
[QUOTE] Hi with comol you can edit the proposed equations, or write everything yourself with the PDE and ODE "physics", check the doc -- Good luck Ivar [/QUOTE] Hi Ivar, I understand that I can change the view of an equation. But how can I reflect in the equation that the derivative must be computed precisely on one of the boundaries at each period of time? Thank you in advance

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