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can i get the solution of boundary condition?
Posted 23.11.2009, 12:10 GMT-5 4 Replies
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I am using the Electrostatic model to solve Poission-Boltzman equation and I set two boundary conditions that two plates have constant electrical potential psi a and psi b . when given the value of psi a and b, i can get the pressure between two plates and after integrate the pressure,i can get the energy between two plate.
However, if i already have the energy value and potential value of one plate like psi a, can i get the value of other plates?
How to set these things?
Many Many thks!
However, if i already have the energy value and potential value of one plate like psi a, can i get the value of other plates?
How to set these things?
Many Many thks!
4 Replies Last Post 01.12.2009, 16:55 GMT-5
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Posted:
2 decades ago
Hi
I do not have a ready answer, but I suspect that you can follow some of the suggestions discussed in the Multiphysics Blog some months ago by Niklas ROM of COMSOL,
try out "BACKWARD" www.comsol.com/community/blogs/multiphysics/9/
Good luck
Ivar
I do not have a ready answer, but I suspect that you can follow some of the suggestions discussed in the Multiphysics Blog some months ago by Niklas ROM of COMSOL,
try out "BACKWARD" www.comsol.com/community/blogs/multiphysics/9/
Good luck
Ivar
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Posted:
1 decade ago
hi, Ivar,
thanks very much for your reply, it do give me some idea about the inverse problem.i would work on that recently.
en....i still have another problem that is can comsol draw an complex geometry automaticly?
For example, my geometry is a rough surface and i divided into 512 pitchs. In comsol model that means consist of 512 groups rectangular, each rectangular has their own distance. How can i draw the geometry like that?
I do not want to draw 512 times ........
Many many thanks!
thanks very much for your reply, it do give me some idea about the inverse problem.i would work on that recently.
en....i still have another problem that is can comsol draw an complex geometry automaticly?
For example, my geometry is a rough surface and i divided into 512 pitchs. In comsol model that means consist of 512 groups rectangular, each rectangular has their own distance. How can i draw the geometry like that?
I do not want to draw 512 times ........
Many many thanks!
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Posted:
1 decade ago
Hi
well either you could try a periodic boundar condition, or I would first try to make 1-2 elements with COMSOL, then save the file, open the "history" file and analyse the geometry section to complete that with a for loop, but it is probably easier to use matlab as interface, or design it with a CAD tool
Good luck
Ivar
well either you could try a periodic boundar condition, or I would first try to make 1-2 elements with COMSOL, then save the file, open the "history" file and analyse the geometry section to complete that with a for loop, but it is probably easier to use matlab as interface, or design it with a CAD tool
Good luck
Ivar
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Posted:
1 decade ago
yeah, thanks Ivar, I thinks matlab would works better.