[Nek5000-users] Converting Mesh using exo2nek

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

The .re2 file created by exo2nek contains only a pseudo fluid boundary i.e. maps
faces with a (side set) id. So no thermal BC.

You have to specify the real boundary conditions for ALL your fields in the usr file based on the side set id.

On 18 Aug 2017, at 01:00, "nek5000-users at lists.mcs.anl.gov <mailto:nek5000-users at lists.mcs.anl.gov> " <nek5000-users at lists.mcs.anl.gov <mailto:nek5000-users at lists.mcs.anl.gov> > wrote:

Thank you for the response. I am trying to compare the rea file generated through ICEM>Cubit>exo2nek>re2torea to a rea file I created using genbox with the same geometry. The simulation I would like to run is more complex than what I am working with now, so I wanted to make sure the mesh conversion would work first. I have been struggling to convert an ICEM mesh to a nek mesh while maintaining boundary conditions and curvature. I ran a quick test where I ran reatore2 with a complete rea file then converted this re2 file back to a rea file for comparison When I do this, all of the boundary conditions are maintained. So it appears that my problem is occurring in exo2nek. 

The README file in exo2nek says that it does not do conjugate heat transfer or periodic boundary conditions, but it looks like it should be able to handle thermal boundary conditions. The fluid boundary conditions from the re2 file seem to be created appropriately with the side set numbers in the fifth column. So it looks like my mesh that I input into exo2nek is causing the problem or something in exo2nek that is causing my problem. Any suggestions would be appreciated. 

Thanks again,

Tommy

On Thu, Aug 17, 2017 at 2:43 PM, <nek5000-users at lists.mcs.anl.gov <mailto:nek5000-users at lists.mcs.anl.gov> > wrote:
Why do you run re2rea in the first place? Do you have any problems with the .re2 file? Please read the README in exo2nek regarding the BCs.

> On 17 Aug 2017, at 22:54, "nek5000-users at lists.mcs.anl.gov <mailto:nek5000-users at lists.mcs.anl.gov> " <nek5000-users at lists.mcs.anl.gov <mailto:nek5000-users at lists.mcs.anl.gov> > wrote:
>
> Hi All,
>
> I have created a 3d mesh using ICEM, exported it as a Hex20 mesh, read that into Cubit where BCs are applied to the side sets and the mesh is converted to Hex27. I then run exo2nek on this mesh and get an re2 file. When I run re2torea, I get the following error:
>
> ABORT: EOF found while reading Annulus-Hex27-Cubit.re2
>
> When I check the new rea file the last line is the Thermal Boundary Conditions header with no data to follow.
>
> It seems that my exo file from Cubit is not providing enough information to exo2nek for a complete re2 file to be made. Does anyone have any suggestions on how to fix this?
>
> Thanks,
>
> Tommy
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