Integrate PDEs in Femlab - Get Help Here

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Discussion Overview

The discussion revolves around integrating partial differential equations (PDEs) in Femlab, specifically focusing on the integration of coupled equations in integral format. Participants are exploring methods for implementing these integrations within the software.

Discussion Character

  • Technical explanation, Exploratory, Debate/contested

Main Points Raised

  • One participant seeks assistance with integrating three PDEs and two coupled equations in integral format within Femlab.
  • Another participant questions whether the integration is for analysis or post-processing, suggesting different approaches based on the purpose.
  • A participant clarifies that the integration is not for post-processing but is essential for their main equation, which involves variables that change over time.
  • Suggestions are made to use integration coupling variables to define an integral over a domain and project the resulting variable into another equation.
  • There is a mention of accessing manuals for further guidance on implementing these methods.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the best approach for integrating the PDEs, and multiple methods are being discussed without resolution.

Contextual Notes

There are limitations regarding the specific assumptions about the equations and the definitions of the variables involved, which may affect the integration process.

mery
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Hi,
I have three PDEs plus 2 coupled eq in integral format. does anyone know how to do the integration in Femlab?
Thanks
 
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Hi Mery, are you after introducing an integral of some quantity in the analysis or "just" integrating something for post-processing or such? For the former, integration coupling variables might do the trick, for the latter, the post-processing integration commands ("meshintegrate", "postint") would be usable.
 
Hi PerennialII,
Is not for post processing. It's my main equation which is coupled with my PDE eq. in my PDE I have to variables call C and q which both of them change with respect to time and for q I have another eq which is in integral format and is kind of averaging over the radius.
Thanks for your help
 
Sounds like could try to implement it using integration coupling variables, i.e. can define an integral over a domain/surface/edge and use (project) the resulting variable to your another equation and its domain. You've access to the manuals?
 

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