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Convective Boundary Condition

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Old   October 28, 2016, 07:45
Question Convective Boundary Condition
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Anirudh Kulkarni
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Dear Foamers,

I am solving a porous media problem in OF. I wish to apply CBC at the outlet of my domain. How to do that?
Should I write custom boundary? Any related tutorial?
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Old   October 28, 2016, 21:23
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Fumiya Nozaki
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Hi,

There are two boundary conditions in OpenFOAM:
  • advective
  • wavetransmissive

I hope my blog post will be of help:
http://caefn.com/2016/07/24/non_refl..._bcs_openfoam/

Best regards,
Fumiya
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Old   October 28, 2016, 22:07
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Anirudh Kulkarni
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Thank you for your helpful response.
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Old   October 28, 2016, 22:11
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Quote:
Originally Posted by fumiya View Post
Hi,

There are two boundary conditions in OpenFOAM:
  • advective
  • wavetransmissive

I hope my blog post will be of help:
http://caefn.com/2016/07/24/non_refl..._bcs_openfoam/

Best regards,
Fumiya
When I apply advective condition at the outlet of my domain I get the following error:

--> FOAM FATAL ERROR:
steadyState
on patch outlet of field U in file "/home/anirudh/OpenFOAM/anirudh-4.1/run/CASE_DONT_DEL/RE30/DA6/0/U"

From function void Foam::advectiveFvPatchField<Type>::updateCoeffs() [with Type = Foam::Vector<double>]
in file fields/fvPatchFields/derived/advective/advectiveFvPatchField.C at line 324.

FOAM exiting
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Old   October 29, 2016, 08:59
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Fumiya Nozaki
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Hi,

The advective boundary condition only supports transient simulations.

Best regards,
Fumiya
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Old   October 29, 2016, 09:14
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Anirudh Kulkarni
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Quote:
Originally Posted by fumiya View Post
Hi,

The advective boundary condition only supports transient simulations.

Best regards,
Fumiya
Yes. I understood that when I further looked into it. But there are recent upgrades which also support steady state simulations. Although since my outlet was located at distant downstream, the outlet BC is not affecting my results much.

Thanks for the help though.

Peace!
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