[Nek5000-users] Robin Boundary Condition -- Navier's Slip Length

[nek5000-users at lists.mcs.anl.gov]

Hi Neks,
I wish to simulate a transitional channel flow whose wall respect a
"slip-length" boundary condition, such as:

$ [u + \delta \frac{\partial u}{\partial n}]_{wall}=0$

Where \delta is the slip length

^n
|        u               u
|      |-->/         |----->/
|      |   /           |      /
|      |  /            |     /
|      | /             |    /
|___|/_______|   /_____
                       | /  ^
                       |/   v \delta

No-slip       Slip-length

(a better sketch can be found here:
http://www.nature.com/nmat/journal/v2/n4/fig_tab/nmat857_F1.html )


I would like to know if this Robin boundary condition for velocity field is
already implemented in the current code.

Thank you

Ciccio
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