- **OpenFOAM**
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- - **Robin boundary condition for the velocity**
(*https://www.cfd-online.com/Forums/openfoam/85832-robin-boundary-condition-velocity.html*)

Robin boundary condition for the velocityHi 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 |

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 |

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) |

Hi Fumiya,
I am looking for robin bc too. Have you allready found an hint how to implement it in OpenFoam? B.r., Martin. |

Hi Martin,
The solver named "adjointShapeOptimizationFoam" contained in OpenFOAM V2.0.0 could be of some help. Hope That Helps, Fumiya |

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