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March 8, 2011, 04:46 |
Robin boundary condition for the velocity
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#1 |
Senior Member
Fumiya Nozaki
Join Date: Jun 2010
Location: Yokohama, Japan
Posts: 266
Blog Entries: 1
Rep Power: 19 |
Hi all,
I'd like to know how to impose the following boundary condition for the velocity U. -----velocity boundary condition----------------------------------- *normal component(Un=U・n): Neumann B.C. *tangential component(Ut=U-(U・n)n): Robin B.C.(A*dUt/dn + B*Ut = C) *A,B and C are not constants but variables ------------------------------------------------------------------- Is it possible using existing utilities? Do I need to implement new boundary condition? Thanks, Fumiya |
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March 8, 2011, 06:01 |
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#2 |
Senior Member
Bernhard
Join Date: Sep 2009
Location: Delft
Posts: 790
Rep Power: 22 |
You can give it a try with groovyBC, however, I'm not sure if you can define the tangential component like that, you can check it here:
http://openfoamwiki.net/index.php/Contrib_groovyBC |
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March 8, 2011, 06:49 |
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#3 |
Senior Member
Fumiya Nozaki
Join Date: Jun 2010
Location: Yokohama, Japan
Posts: 266
Blog Entries: 1
Rep Power: 19 |
Hi Bernhard,
Thank you for your reply. I tried with groovyBC, however, I think I can't change bc type with the direction because fractionExpression is a scalar. Dirichlet (fractionExpression=1) Neumann (fractionExpression=0) |
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June 10, 2011, 07:50 |
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#4 |
Member
Join Date: Aug 2010
Posts: 31
Rep Power: 16 |
Hi Fumiya,
I am looking for robin bc too. Have you allready found an hint how to implement it in OpenFoam? B.r., Martin. |
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