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

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

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