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Using asphalt as a solar collector : divergence problem (new user)
Posted 7 avr. 2010, 04:30 UTC−4 1 Reply
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Dear Colleagues,
I am a new COMSOL user and I have some difficulties to make it work.
I explain myself : I am working on my Master Thesis now, and I am focusing on an asphalt collector system: by extracting the heat from the sun's radiation, by the mean of pipes with water flow installed in asphalt roads/pavements (thanks to its high thermal absorptivity)
In the model, representing a portion of asphalt with three pipes(with water), I'm using the general heat transfer module and the incompressible Navier-Stokes module.
The main interest, in my study,is the increase of the water temperature from the inlet to the outlet.
Whereas the system seems quite simple, I have some problems right now.
I got this kind of error message:
"Error:
Failed to find a solution:
Divergence of the linear iterations.
Returned solution has not converged."
I tried to : - change the inlet velocity
- use the time dependent solver instead
- improve the meshing
- set different boundaries
I also looked there :
www.comsol.com/support/knowledgebase/964/
But the error message is slightly different in my case.
It seems that the problem comes from the incompressible Navier-Stokes module.
It is my first project with COMSOL and I thought that this simulation was not very difficult to run, but now I am stuck because of my lack of experience with the software.
I would appreciate any help about how to proceed to make it converge.
Thank you very much in advance !
Kind regards,
Nicolas
I am a new COMSOL user and I have some difficulties to make it work.
I explain myself : I am working on my Master Thesis now, and I am focusing on an asphalt collector system: by extracting the heat from the sun's radiation, by the mean of pipes with water flow installed in asphalt roads/pavements (thanks to its high thermal absorptivity)
In the model, representing a portion of asphalt with three pipes(with water), I'm using the general heat transfer module and the incompressible Navier-Stokes module.
The main interest, in my study,is the increase of the water temperature from the inlet to the outlet.
Whereas the system seems quite simple, I have some problems right now.
I got this kind of error message:
"Error:
Failed to find a solution:
Divergence of the linear iterations.
Returned solution has not converged."
I tried to : - change the inlet velocity
- use the time dependent solver instead
- improve the meshing
- set different boundaries
I also looked there :
www.comsol.com/support/knowledgebase/964/
But the error message is slightly different in my case.
It seems that the problem comes from the incompressible Navier-Stokes module.
It is my first project with COMSOL and I thought that this simulation was not very difficult to run, but now I am stuck because of my lack of experience with the software.
I would appreciate any help about how to proceed to make it converge.
Thank you very much in advance !
Kind regards,
Nicolas
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1 Reply Last Post 8 avr. 2010, 02:15 UTC−4