[Nek5000-users] set obj for internal fluid surface

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

Hi Mike,

I normally would do this by some geometric marker, coupled
with the direction of the outward facing normal.

Presumably you have some idea of what fluid surface
you have in mind (and hopefully it coincides with a 
mesh surface).  With this information you should be
able to pick off the faces of interest and identify
them as belonging to an object?

Let me know if this helps or if I can clarify further.

Best,

Paul


On Mon, 12 Sep 2011, nek5000-users at lists.mcs.anl.gov wrote:

> All,
>
> I'm working with the calc_torque routine, and I want to calculate the
> torque/drag along a surface within the fluid domain (not on the boundary).
> Is there a straight-forward way to "set_obj" for such a surface?  It's
> straightforward for external fluid boundaries, as you can just search on
> certain boundary conditions and grab those element faces.  It's not so clear
> for me how to do the same for some internal surface.
>
> Thanks.
> --Mike
>
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