On 19 Aug 2016, at 17:11, David Moxey <d.moxey@imperial.ac.uk> wrote:

Hi Ding,

I don't believe there are any boundary conditions explicitly applied to
\hat{v}. Indeed I think if you were to do this I suspect you would end
up with the wrong pressure; the combination of the convective term
without any BCs applied to them, together with the pressure boundary
condition is then consistent with the original equations meaning that
the Helmholtz solve for velocity (where the velocity BCs are imposed)
will impose the divergence condition.

Or at least I believe is the case. Others may have an alternative
opinion.

Cheers,

Dave

On Fri, 2016-08-19 at 22:53 +0800, 丁老师 wrote:

  Thank you very much. I  know the paper of the karniadakis. 
  what i mean is the value of the  first intermediate velocity  " v
caret" on the boundary, since we need to compute the "nabla dot v
caret " for the source term of the pressure equation. 
Regards







At 2016-08-19 21:27:05, "David Moxey" <d.moxey@imperial.ac.uk> wrote:

Hi Ding,

Sorry, a bit confused by the question. Do you mean in the velocity

correction scheme? If so, we use a so-called high-order pressure
boundary condition for the Poisson solve (this is documented in the
book by Karniadakis and Sherwin and is in a paper somewhere), and the
velocity conditions are imposed at the last Helmholtz solve step.

Cheers,

Dave

On 18 Aug 2016, at 10:40, 丁老师 <ztdepyahoo@163.com> wrote:
 
Dear Nektar group:
      Could you please give me some suggestions about the boundary

condition for the first and second intermediate velocity field? 

Does it use the same with the real velocity boundary conditions.
 
Regards
Your Sincerely
Ding
 
 
  
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David Moxey (Research and Teaching Fellow)
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-- 
David Moxey (Research and Teaching Fellow)
d.moxey@imperial.ac.uk | www.imperial.ac.uk/people/d.moxey

Room 364, Department of Aeronautics,
Imperial College London,
London, SW7 2AZ, UK.



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