[Nek5000-users] 3D computations in 2D axisymmetric geometry

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

Dear Neks,

My plan is to do 3D stability computations in an axisymmetric  
geometry, starting in October. Even if the geometry is 2D, the flow  
will be 3D, so I need to do a 3D mesh (not just a slice with constant  
theta). The cluster hours for that project will only last 5 months, so  
I need to get going in October, so I need to start thinking about the  
mesh already. I have run planar geometries before (channel junction as  
the last one), which were easy to mesh in prenek.

I was wondering how other people running similar computations have  
created their mesh. What would be a good starting point? I have seen  
some examples of pipe flow mesh cross section with "rectangular mesh  
section" in the middle, and curved elements outside. Is this the best  
way to go? Make a mesh for a pipe cross-section and then extrude it in  
the axial direction?

My geometry will also have an inlet, but if I am able to make a mesh  
for a pipe and for an annulus, and incline them in the axial  
direction, I will be fine.

Thank you in advance,

Outi
P.S. I have asked about a 2D axisymmetric mesh before, but that time  
we chose a planar flow case instead (channel junction), which I was  
able to mesh in prenek. The axisymmetric geometry I am considering now  
is not the same I was considering before.


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