[Nek5000-users] Dirichlet-Neumann BC

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

Hi,

there are so-called traction boundary conditions (or mixed 
traction-velocity boundary conditions), see the documentation 
https://nek5000.github.io/NekDoc/theory.html
(it is in the section about passive scalars, which is perhaps not 
ideal). The conditions should work for both PnPn and PnPn-2, but for 
some cases you need the stress formulation. I am not sure whether Nek is 
properly catching all impossible (or unimplemented) combinations.

There are some Nek examples that use these conditions, so you can get 
some guidance from there.

Hope this helps,
Philipp

On 2018-07-18 09:38, nek5000-users at lists.mcs.anl.gov wrote:
> Dear Neks,
> 
> 
> I have been looking into the different boundary conditions available by 
> default in bdry.f. However, I haven't seen any mixed conditions. I would 
> like to impose a no slip condition and specify the shear stress at the 
> boundary. The boundary is flat and aligned with the mesh.
> 
> Moreover it seems that shear stress boundary conditions are applicable 
> only to the Pn-Pn-2 formulation. Is there a way I can specify the wall 
> normal streamwise velocity gradient u_y as well ?
> 
> 
> Best regards,
> 
> Armand.
> 
> -- 
> *Armand Shams*
> Master Thesis Intern
> Département aérodynamique, aéroélasticité, acoustique
> MSAT
> Tél: +33 6 99 51 15 84
> 
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