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July 2, 2014, 10:20 |
viewFactor radiation model problem!
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#1 |
New Member
Rafa
Join Date: May 2014
Location: Spain
Posts: 4
Rep Power: 11 |
Hi there!
I am currently trying to include viewFactor radiation model in my case. The case is heat generating container sitting on concrete base-mat surrounded by air. As BC, the sides the region of air are considered as InletOutlet while the roof is zeroGradient. My concerns are as follows: 1. Concerning Qr file, what BC do i establish for the sides? (as its not a wall itself). Ive been trying greyDiffusiveRadiationViewFactor but apparently its not working.... 2. In case i use type calculated for these BC im talking above, when running the solver chtMultiRegionSimpleFoam, i get the following error: PHP Code:
Thank you very much |
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July 4, 2014, 06:34 |
greyDiffusiveRadiationViewFactor is correct
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#2 |
Senior Member
Fabian Roesler
Join Date: Mar 2009
Location: Germany
Posts: 213
Rep Power: 18 |
Hi
You were right setting the BC for the side walls to Code:
sideWall { type greyDiffusiveRadiationViewFactor; emissivityMode lookup; Qro uniform 0; emissivity uniform 1; value uniform 0; } Code:
fluid_to_solid { type greyDiffusiveRadiationViewFactor; value uniform 0; emissivityMode solidRadiation; Qro uniform 0; } Cheers Fabian |
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July 4, 2014, 10:12 |
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#3 |
New Member
Rafa
Join Date: May 2014
Location: Spain
Posts: 4
Rep Power: 11 |
Hi there!
Fabian, thanks a lot for you reply first of all... You were right, I've already changed the BC to greyDiffusiveRadiationViewFactor. I was mistaken there. I'm following the multiRegionHeaterRadiation tutorial, which is really similar to the case I'm simulating (multi region, chtMultiRegionSimpleFoam with viewFactor radiation model). Still then, the problem i had before still appears: --> FOAM FATAL ERROR: request for volScalarField Qr from objectRegistry chapa failed available objects of type volScalarField are 8 ( betavSolid h kappa Cp p T thermo:rho thermo:alpha ) As i understand it, it seems as if the code is not recognizing Qr file as a volScalarField (Its not in the list of available objects) for the region chapa (solid region). Any has a clue of what this error means??? I would be really pleased if anyone could share any similar experience.... Thank you Rafa |
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July 7, 2014, 04:06 |
only T and p in solid region
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#4 |
Senior Member
Fabian Roesler
Join Date: Mar 2009
Location: Germany
Posts: 213
Rep Power: 18 |
Hi
Yes, that's right. Qr is not defined in solid mesh. There you only have temperature T for thermal diffusion and pressure p. The latter does not make much sense. However, I suppose you need it to initialize the simple algorithm for the solid mesh. When you have a look into the tutorial you will see that all other fields from the solid region are deleted. Did you set the constant/regionProperties? And did you do some changeDirectory to the boundaries? Cheers Fabian |
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July 7, 2014, 10:48 |
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#5 |
New Member
Rafa
Join Date: May 2014
Location: Spain
Posts: 4
Rep Power: 11 |
Hi there!
Thanks a lot for your help Fabian, your advice gave me the definitive clue to solve the issue! I have it already running! As you mentioned, Qr doesn't apply to solid regions. So, trying to understand the issue, the error that was telling me that somewhere in my folders, i was calling Qr for the solid region, and it shouldn't be. So i realized when looking into the 0/solidRegion/T, for the solidRegion_to_fluidRegion BC i had: PHP Code:
Code:
request for volScalarField Qr from objectRegistry "solidRegion" failed PHP Code:
Thanks a lot! Rafa |
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July 7, 2014, 11:08 |
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#6 |
Senior Member
Fabian Roesler
Join Date: Mar 2009
Location: Germany
Posts: 213
Rep Power: 18 |
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