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## Re: [ff3d-users] Extraction of the unit normal vector, or normal/tangent

**From**: |
Stephane Del Pino |

**Subject**: |
Re: [ff3d-users] Extraction of the unit normal vector, or normal/tangential derivatives. |

**Date**: |
Thu, 23 Oct 2008 09:00:23 +0200 |

**User-agent**: |
KMail/1.9.9 |

Dear Mykola,
Le mardi 21 octobre 2008, Mykola Tasinkevych a écrit :
>* Dear Stéphane,*
>
>* thank you for your advise!*
>
>* As I understand, your penalty term is forcing the flow field "u" only to*
>* be parallel to the surface of obstacle, but*
>* does not prescribe a specific slip, "u = *slip* on [ref] ", where *slip *
>* *is some function.*
Sorry I did not read carefully your first e-mail.
>* One, in principle, can also penalize the variational formula in order to*
>* impose*
>* u = *slip*
>* *on the boundary. Is it also possible to impose this condition*
>* rigidly, as a boundary*
>* condition?*
Yes, It should be possible. Maybe you will need to "precompute", dx(RHO),
dy(RHO) and dz(RHO) storing them in a function or a femfunction. I am not
sure that using them for the boundary condition directly is accepted.
Telle me if it works or not.
Best regards,
Stéphane.