[Nek5000-users] Pn-Pn boundary condition

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

  Hi all,

I am wondering if there is any reference on the pressure boundary 
condition for Pn-Pn case? I know Dr. Fisher has a 1997 JCP paper 
discussing the Pn-Pn-2 setting.

Also what subroutines/functions handle with the boundary conditions for 
both velocity and pressure? Thank you,

Zhu Wang
Virginia Tech


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Dear Fred,

The pressure bcs are chosen to ensure div.U=0.

For the Pn-Pn case, this involves addition of an appropriate inhomogeneity
that cancels the b.l. divergence that arises from std. splitting
formulations.

For the Pn-Pn-2 case, there are no pressre bcs, only velocity bcs.

Paul

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On Thu, 24 Jun 2010, nek5000-users at lists.mcs.anl.gov wrote:

 > Dear NEKs,
 >
 > I wanted to ask which boundary condition is used for the pressure in 
nek??
 > are all pressure gradients normal to wall set tto zero?? because in my
 > current simulation i have a pressure gradient normal to a wall and i am
 > wondering why!?
 >
 > best, fred
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