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Does anyone know the how I should implement dweak (in 3.5a) in version 4

Posted 2011年4月29日 GMT-4 15:28 Modeling Tools & Definitions, Parameters, Variables, & Functions, Studies & Solvers Version 3.5a, Version 4.0a, Version 4.1, Version 4.2 7 Replies

Hui Chen
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I was just wondering if anyone has the same problem on finding dweak (for Weak Form PDE) in the Comsol 4. It seams that the new model nodes change it all. Is there any example on how to impose the dweak equation to the model? Any hints will be gratefully appreciated.

Hui
7 Replies Last Post 2012年10月29日 GMT-4 23:14
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Hello Hui Chen

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Steven Wang
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Posted: 1 decade ago 2011年8月24日 GMT-4 10:40
I have the same problem and don't know what to do. Cannot find the time-dependent weak terms in V4.

Can anybody help? Thx
I have the same problem and don't know what to do. Cannot find the time-dependent weak terms in V4. Can anybody help? Thx
bailo
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Posted: 1 decade ago 2011年8月24日 GMT-4 10:55
if I understood well about your question, you could try to type your weak expression with the time derivatives terms. for example, if w is your variable, you can relate your equations with the time by writing wt.. (first derivative related with the time)

Hope this could be useful for you.
--
Martino
if I understood well about your question, you could try to type your weak expression with the time derivatives terms. for example, if w is your variable, you can relate your equations with the time by writing wt.. (first derivative related with the time) Hope this could be useful for you. -- Martino
Rakesh Dhote
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Posted: 1 decade ago 2011年8月24日 GMT-4 11:16
What problem are you trying to solve
Please share.
What problem are you trying to solve Please share.
Steven Wang
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Posted: 1 decade ago 2011年8月24日 GMT-4 11:24
Hi, I am trying to model the full-vectorial whispering-gallery-mode (www.npl.co.uk/science-technology/time-frequency/microwave-frequency-standards/research/2.5-d-simulation-of-axi-symmetric-electromagnetic-structures) and basically use the same method which is based on weak form PDE. All the examples on the wbesite are in early version 3.x. Now I am trying to use the V4 to do the same thing but there is no dweak in V4.
Hi, I am trying to model the full-vectorial whispering-gallery-mode (http://www.npl.co.uk/science-technology/time-frequency/microwave-frequency-standards/research/2.5-d-simulation-of-axi-symmetric-electromagnetic-structures) and basically use the same method which is based on weak form PDE. All the examples on the wbesite are in early version 3.x. Now I am trying to use the V4 to do the same thing but there is no dweak in V4.
Magnus Ringh COMSOL Employee

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Posted: 1 decade ago 2011年8月24日 GMT-4 11:29
That is correct, you add the time-derivative terms directly using, for example, wt to represent the time derivative of w. The dweak field was optional in version 3.5a, which also supported this improved "implicit form" of the weak formulation. See, for example, the Transport and Adsorption model in the COMSOL Multiphysics Model Library, which models a surface concentration using a time-dependent weak PDE formulation on the boundary.

Best regards,
Magnus Ringh, COMSOL
That is correct, you add the time-derivative terms directly using, for example, wt to represent the time derivative of w. The dweak field was optional in version 3.5a, which also supported this improved "implicit form" of the weak formulation. See, for example, the Transport and Adsorption model in the COMSOL Multiphysics Model Library, which models a surface concentration using a time-dependent weak PDE formulation on the boundary. Best regards, Magnus Ringh, COMSOL
Alexandros Kapsalis
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Posted: 1 decade ago 2012年2月28日 GMT-5 14:06
Hi

I m still having the same problem previous users have risen. So, how do we set the dweak parameters?

Thank you
Hi I m still having the same problem previous users have risen. So, how do we set the dweak parameters? Thank you
Neetesh Singh
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Posted: 1 decade ago 2012年10月29日 GMT-4 23:14
Hi All

Has anyone been able to simulate microdisk in comsol 4.3. with PML boundary condition ?

cheers
Hi All Has anyone been able to simulate microdisk in comsol 4.3. with PML boundary condition ? cheers

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