[Nek5000-users] Flow past cylinder

[stefanke]

Hi,

a good meshing tool is really missing in nek5000 but I am afraid there  
is _no_ good high-order quad/hex mesher.
In the case of spectral elements you typically end up with big  
elements and you really need a high order geometry representation  
otherwise you're not really flexible if it comes to meshing. In  
addition to it you may run into accuracy issues if you're using a  
lower (e.g. 2nd-order) representation of your geometry.

However high-order surface meshing etc. is very difficult for complex  
geometries especially for hex meshes. Most of the meshing tools  
(Cubit, Gambit, ..) are designed for lower-order methods (e.g.  
FEM,FVM) so they're not ideal at all.


Stefan


On Sep 22, 2009, at 12:52 PM, wangzhicheng wrote:

> Hi everyone
>
> I finally solved the problem of element mismatch that mentioned in  
> the previous email. This problem is a result of curves-reading bugs  
> in tool sem2nek.
>
> Semtex is a quadrilateral spectral element DNS code that has a mesh  
> converter from  Gambit mesh generator and a tool---sem2nek, which  
> converter mesh format from semtex to nekton format.  So maybe we  
> could use these two converters to create mesh that can be read by  
> nek5000.
>
> http://users.monash.edu.au/~bburn/semtex.html
>
>
>
> Best Regards
>
> Zhicheng Wang
>
>
>
>
>
>
>
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