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how to set output of an stationary model as initial value for a time dependent model?

Posted Jul 6, 2011, 11:54 a.m. EDT Modeling Tools & Definitions Version 4.1, Version 4.2 10 Replies

Mohammad
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hi every body,

I have a model consisting of two equations(one stationary and one time dependent). answer of first equation is initial condition for the second. solution of each equation is OK. but i do not know how to couple two equations?

Normally I add an stationary study, then I add a time dependent study to this study, then i use "show default solver" and after that i try to run the study but it does not work.

can anyone help me?
10 Replies Last Post Mar 28, 2015, 6:01 p.m. EDT
Sam Gage
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Posted: 1 decade ago Jul 6, 2011, 6:40 p.m. EDT
Please send ur model so we Can help u ...
Please send ur model so we Can help u ...
Mohammad
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Posted: 1 decade ago Jul 8, 2011, 10:07 a.m. EDT
Hi sam,

please find the attachment. stationary and time dependent studies are working properly.
but coupling two solution is not successful.

kind regards,
Mohammad
Hi sam, please find the attachment. stationary and time dependent studies are working properly. but coupling two solution is not successful. kind regards, Mohammad

Attachments:

Sam Gage
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Posted: 1 decade ago Jul 20, 2011, 3:01 p.m. EDT
In fact U have to treat ur own Equations ... I don't know what is the physics but i am sure u can change to have only one Equation and one study as stationary study is a specific case of time dependent (in my opinion).
In fact U have to treat ur own Equations ... I don't know what is the physics but i am sure u can change to have only one Equation and one study as stationary study is a specific case of time dependent (in my opinion).
Dhruv Kedar
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Posted: 1 decade ago Jul 20, 2011, 5:02 p.m. EDT
Solve transient problem, store solution. Then in solver manager, solve stationary problem with initial value setting, initial value evaluated using stored solution
Solve transient problem, store solution. Then in solver manager, solve stationary problem with initial value setting, initial value evaluated using stored solution
Subhra Paul
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Posted: 1 decade ago Sep 19, 2011, 1:55 p.m. EDT
Hello Mohamad,

could you please let me know if you had solved the problem? I am working on similar problem. Also are you using COMSOL 3.5a?
Hello Mohamad, could you please let me know if you had solved the problem? I am working on similar problem. Also are you using COMSOL 3.5a?
Mohammad
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Posted: 1 decade ago Sep 25, 2011, 3:36 p.m. EDT
hi Subhra,

yes i've found the soluiton. I'm working with 4.2
hi Subhra, yes i've found the soluiton. I'm working with 4.2
Hannah Viefhaus
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Posted: 1 decade ago Oct 4, 2011, 6:12 a.m. EDT
Hey Mohamad,

and how did you solve the problem? I have a similar problem, so it might help to know what you did.

Regards
Hannah
Hey Mohamad, and how did you solve the problem? I have a similar problem, so it might help to know what you did. Regards Hannah
Mohammad
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Posted: 1 decade ago Oct 4, 2011, 6:34 a.m. EDT
hi Hannah,

you can set two studies, first stationary and then time dependent. choose solver at the time dependent solver, afterwards select dependent variables, u can set the input parameters from another solver.

goo luck,
Mohammad
hi Hannah, you can set two studies, first stationary and then time dependent. choose solver at the time dependent solver, afterwards select dependent variables, u can set the input parameters from another solver. goo luck, Mohammad
Hannah Viefhaus
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Posted: 1 decade ago Oct 4, 2011, 7:36 a.m. EDT
Thanks Mohamad!!
Thanks Mohamad!!
Lanju Mei
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Posted: 1 decade ago Mar 28, 2015, 6:01 p.m. EDT
Hello, Mohammad
Would you please send your successful coupling file to me? I have the same problem. Many thanks.
Lanju
Hello, Mohammad Would you please send your successful coupling file to me? I have the same problem. Many thanks. Lanju

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