[Nek5000-users] Periodic-AUTO using pretex problem

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

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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