[Nek5000-users] 2 and a half dimentions with nekton?

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

Sounds good! Thanks for the advice. 
I will look into it and let you know.
Antonios

On Thu, 2010-04-01 at 11:54 -0500, nek5000-users at lists.mcs.anl.gov
wrote:
> Dear Antonios,
> 
> 
> Your suggestion to use two perturbation modes to represent
> the real and imaginary parts is an excellent one - I think
> you could code this in a fairly std way, particularly if you
> are not using the characteristics time stepping (i.e., if you
> are using the BDF/EXT scheme, which is standard).  In that case,
> one would only need to add to ffx and ffy the additional
> terms associated with the interactions of the sin/cosine
> terms.   The timestepper treats ffx and ffy w/ exactly the
> same extrapolation as the nonlinear terms, so everything should
> go through w/o much effort.
> 
> Best regards,
> 
> Paul
> 
> 
> On Thu, 1 Apr 2010, nek5000-users at lists.mcs.anl.gov wrote:
> 
> > Dear Paul & Stefar,
> >
> > One question: In the case of the perturbation mode if one has a base
> > flow with one homogeneous direction the perturbation equation for three
> > dimensional disturbances (perturbation fields) can be solved in Fourier
> > space with one fourier mode in that direction and then only one point is
> > necessary instead of 3 X N (the polynomial order) and it becomes as
> > expensive as a 2D simulation. I wonder if a feature like that exists in
> > the current version of the code or maybe in an older one.
> >
> > hint(?) : Maybe one could use two separate perturbation fields to store
> > the "real" and "imaginary" part of the perturbation.
> >
> >
> > Regards & happy Easter!
> > Antonios
> >
> > ps: This procedure is often termed 2.5D, hence the subject text.
> >
> > -- 
> > ---------------------------------------------------------------------------------------------
> > Antonios Monokrousos
> > Department of Mechanics                 email:    antonios at mech.kth.se
> > Royal Institute of Technology (KTH)     phone:    +46 8 790 68 76
> > Osquars Backe 18                        telefax:  +46 8 796 98 50
> > SE-100 44 Stockholm, SWEDEN
> >
> >
> >
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