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Perfect adiabatic boundary condition

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Old   June 12, 2020, 06:26
Default Perfect adiabatic boundary condition
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Hi openFoamers,
Does anyone have any idea how a perfect adiabatic boundary condition (zero net flux of convection and radiation) can be implemented in openFOAM? I am using chtMultiregionSimpleFOAM solver.

Last edited by Hossein_s; June 12, 2020 at 13:09.
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Old   June 15, 2020, 15:12
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Nabeel Khaleel
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Hi Hossein
For convection part, you have to set in 0/Folder, solid part:

{

type fixedGradient;
gradient uniform 0;

}


In constant folder for radiation part, fluid region/ radiationProperties file

radiation off;

radiationModel none;
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Old   June 15, 2020, 16:20
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Hi Nabeel,
Thank you for your answer.
The fixedGradient b.c doesn't do what I want (zero net flux), since we have the contribution of radiation! Basically we need the radiation, so it can not be also turned off!
I implemented a boundary condition using the heat balance at the boundary and defining an adiabatic surface temperature based on analytical solution!

Thank you by the way
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Old   June 18, 2020, 06:03
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Simpler way!
Using externalWallHeatFluxTemperature, mode -> power or flux, q or Q -> 0! This way the heat balance equation will be set to zero.
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Old   June 19, 2020, 16:26
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Quote:
Originally Posted by Hossein_s View Post
Simpler way!
Using externalWallHeatFluxTemperature, mode -> power or flux, q or Q -> 0! This way the heat balance equation will be set to zero.
Hi Hossein
I never use it.. It's good chance to have a look... Thanks for the sharing

Best Regards
Nabeel
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adiabatic wall, b.c., radiation convection

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