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Note: This discussion is about an older version of the COMSOL Multiphysics® software. The information provided may be out of date.

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coupled nonlinear odes: bvp

Posted 2010年6月2日 GMT-4 07:32 Version 3.5a 5 Replies

Mohammad Khalid
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can i solve my own model of coupled nonlinear odes (bvp)
5 Replies Last Post 2013年1月29日 GMT-5 02:45
Danial Tz
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Posted: 1 decade ago 2010年6月2日 GMT-4 07:51
You can solve ODE's in Comsol. In Comsol 3.5a look at the global equations under physics menu. There are very nice examples in the documentation on how to do it.
You can solve ODE's in Comsol. In Comsol 3.5a look at the global equations under physics menu. There are very nice examples in the documentation on how to do it.
Mohammad Khalid
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Posted: 1 decade ago 2013年1月28日 GMT-5 02:49
can i solve the attached model
can i solve the attached model

Attachments:

Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)
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Posted: 1 decade ago 2013年1月28日 GMT-5 06:54
Hi

you need to reexpress your model to fit into the parameters of the standard COMSOL PDE equations. You might need to define intermediate variables and new BC for these

--
Good luck
Ivar
Hi you need to reexpress your model to fit into the parameters of the standard COMSOL PDE equations. You might need to define intermediate variables and new BC for these -- Good luck Ivar
Mohammad Khalid
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Posted: 1 decade ago 2013年1月29日 GMT-5 00:26

Hi

you need to reexpress your model to fit into the parameters of the standard COMSOL PDE equations. You might need to define intermediate variables and new BC for these

--
Good luck
Ivar


Hi
thanks for response. Please let me know what do you mean by new bc for these equations.

khalid
[QUOTE] Hi you need to reexpress your model to fit into the parameters of the standard COMSOL PDE equations. You might need to define intermediate variables and new BC for these -- Good luck Ivar [/QUOTE] Hi thanks for response. Please let me know what do you mean by new bc for these equations. khalid
Magnus Ringh COMSOL Employee

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Posted: 1 decade ago 2013年1月29日 GMT-5 02:45
Hi,

I don't think you need to define any intermediate variables. That is typically only necessary if you have derivatives of order higher than 2 in your equations. I would formulate this as two coupled 1D PDEs along a line from 0 to 1 with two dependent variables: n and T (using a single Coefficient Form PDE in COMSOL). The equations look quite nonlinear but should be possible to solve.

Best regards,
Magnus Ringh, COMSOL
Hi, I don't think you need to define any intermediate variables. That is typically only necessary if you have derivatives of order higher than 2 in your equations. I would formulate this as two coupled 1D PDEs along a line from 0 to 1 with two dependent variables: n and T (using a single Coefficient Form PDE in COMSOL). The equations look quite nonlinear but should be possible to solve. Best regards, Magnus Ringh, COMSOL

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