[Nek5000-users] Periodic-AUTO using pretex problem

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

Thank you very much Paul. I will give a try tomorrow and let you know. 

thanks 
Sijo 


De: "nek5000-users" <nek5000-users at lists.mcs.anl.gov> 
À: "nek5000-users" <nek5000-users at lists.mcs.anl.gov> 
Envoyé: Mercredi 13 Juin 2018 22:33:13 
Objet: Re: [Nek5000-users] Periodic-AUTO using pretex problem 






Dear Sijo, 




Attached is a code n3to2.f --- written 10 years ago and not tested since. You can 

try this; or you can just write a script to 

extract the xy coordinates and requisite 

bcs from your 3D .rea file. 




No guarantees on the attached, but it's 

intent is to take a single-slice 3D Rea file 

and convert it to 2D. 




Assumption is that your elements are 

aligned such that the "t" direction in the 

unit cube is aligned with z in physical space. 




Paul 



From: Nek5000-users <nek5000-users-bounces at lists.mcs.anl.gov> on behalf of nek5000-users at lists.mcs.anl.gov <nek5000-users at lists.mcs.anl.gov> 
Sent: Wednesday, June 13, 2018 3:22:47 PM 
To: nek5000-users 
Subject: Re: [Nek5000-users] Periodic-AUTO using pretex problem 
Thanks Paul. 
Can I convert a 2D mesh with a small thickness in Z direction (3D ) using n2to3? 

The thing is, I use ICEM for meshing and converting it into .msh format. Then I use mshconvert.py for the conversion to NEK5000. 

So for the mshconvert.py I make a small thickness on the mesh to make HEXA8 mesh. 

Or do you have any solution for this too? 

Thank in advance 
Sijo 


De: "nek5000-users" <nek5000-users at lists.mcs.anl.gov> 
À: "nek5000-users" <nek5000-users at lists.mcs.anl.gov> 
Envoyé: Mercredi 13 Juin 2018 21:17:27 
Objet: Re: [Nek5000-users] Periodic-AUTO using pretex problem 






Dear Sijo, 




I would recommend using n2to3 to extrude 

the 2D geometry 

and then periodicity will be built in. 




Paul 



From: Nek5000-users <nek5000-users-bounces at lists.mcs.anl.gov> on behalf of nek5000-users at lists.mcs.anl.gov <nek5000-users at lists.mcs.anl.gov> 
Sent: Wednesday, June 13, 2018 11:54:13 AM 
To: nek5000-users 
Subject: [Nek5000-users] Periodic-AUTO using pretex problem 
Hello Neks, 

I was setting up a mesh of NACA foil in 3D with periodic BC on both sides. Since there was some problem with converting BC's from ICEM to NEK5000. I gave a space as BC and then using prex I fill up the empy spaces by using periodic Auto button. 

But its running for a long time. It means its running through the same elements again and again. 

I tired on a simple case (example a cube). it worked well. 

The difference between the NACA case and cube is that, along the spanwise direction of NACA I did not give any elements (i just give a thickness to the mesh) but for the cube there were 2 elements in Z direction. 

So could you please tell me how can I solve this problem? 

Thanks in advance 

Sijo GEORGE 

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