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-   -   [ANSYS Meshing] Rotating machine (http://www.cfd-online.com/Forums/ansys-meshing/105544-rotating-machine.html)

msatrustegui August 2, 2012 05:00

Rotating machine
 
Hi everyone,

I'm trying to simulate a rotating machine and i am having some dificulties setting the named selections in the meshing.

Do i have to separate the body in two diferent parts (rotor and stator)? Do i have to declare as a wall the separation between the rotor and the stator?

Thank you.

msatrustegui August 2, 2012 07:57

My main problem is that I donīt know how to do all the named selection in the meshing. Do i have to name the bodies? Or only the surfaces? Fluent is giving me the following mistake:

********************* WARNING ******************************************
************************************************** **********************
** Following mesh operations failed:
** Rename Zone [ 3 ] wall-exterior-part to wall-part_2-solid (Failed)
**
** Please ensure that your current Setup is valid.
************************************************** **********************
************************************************** **********************

strobel August 2, 2012 12:07

maybe you have same regions with 2 or more names.

msatrustegui August 3, 2012 04:01

i've been working in a simplified model, using the following named selections:

-Fluid (aplied to all the bodies)
-Wall (All the stationary walls)
-Pressure-inlet (Inlet face)
-Pressure-outlet (Outlet face)
-Interface-inlet (face between rotor and stator in the inlet)
-Interface-outlet (face between rotor and stator in the outlet)

And Fluent show me the following mistake:

********************* WARNING ******************************************
************************************************** **********************
** Following expected zones were not found in the current mesh:
** part-solid
** wall-part-solid
** interior-part-solid
** Found Following new zones in the current mesh:
** interior-fluid
** wall-fluid
** fluid
**
** Please ensure that your current Setup is valid.
************************************************** **********************
************************************************** **********************

What changes should i do in the named selections?

flotus1 August 3, 2012 04:39

I think this mistake comes from the previously loaded mesh in fluent.
Are you using the workbench environment?

Anyway, before trying anything else, replace the mesh in fluent. (mesh - replace)

I am pretty sure that you need two cell zones for a rotor-stator setup. The faces belonging to the distinct cell zones have to be in different named selections.
Doesn't the fluent manual provide any guidance about the setup?

msatrustegui August 3, 2012 06:03

Iīve tried changing the named selection in the mesh, and this time iīve put them like this:

fluid-estator (stationary-body)
fluid-rotor (rotating-body)
wall-estator (stationary wall faces)
wall-rotor (moving wall faces)
interface-rotor-inlet (common face between rotor and stator in the inlet)
interface-rotor-outlet (common face between rotor and stator in the outlet)
interface-estator-inlet (common face between rotor and stator in the inlet)
interface-estator-outlet (common face between rotor and stator in the outlet)
pressure-inlet
pressure-outlet

The warning i got in fluent was the following:

********************* WARNING ******************************************
************************************************** **********************
** Following mesh operations failed:
** Rename Zone wall to wall-exterior (Failed)
** Following expected zones were not found in the current mesh:
** part-solid
** wall-part-solid
** interior-part-solid
** interface-outlet
** interface-inlet
** wall-exterior
** Found Following new zones in the current mesh:
** interior-fluid-estator
** interior-fluid-rotor
** wall-estator
** wall-rotor
** interface-rotor-outlet
** interface-rotor-inlet
** interface-estator-inlet
** interface-estator-outlet
** fluid-estator
** fluid-rotor
**
** Please ensure that your current Setup is valid.
************************************************** **********************
************************************************** **********************

I've separate the body into two parts, consisting in the moving body(rotor) and the stationary body(estator).

I think the mistake must be on either the named selections, or the diferent parts of the body.

Thanks for the answers.

flotus1 August 3, 2012 07:34

Were my annotations so inappropriate that you don' even want to comment on them?

msatrustegui August 3, 2012 07:51

Quote:

Originally Posted by flotus1 (Post 375228)
Were my annotations so inappropriate that you don' even want to comment on them?

So sorry, i got yesterday my new account and it's my first time in forums. So i`m not sure how i have to proceed. Next time i'll answer directly on your comments.

flotus1 August 3, 2012 08:11

So? did you replace the mesh? Is it Workbench you are using?

msatrustegui August 4, 2012 14:06

I think the mistake must be in the way i create the named selections.

msatrustegui August 4, 2012 14:09

Quote:

Originally Posted by flotus1 (Post 375235)
So? did you replace the mesh? Is it Workbench you are using?

Yes, I'm using Workbench. I've divide the body in two parts, one consisting of the rotor and the other one of the stator. The diferent named selections i create are the following:
fluid-estator (stationary-body)
fluid-rotor (rotating-body)
wall-estator (stationary wall faces)
wall-rotor (moving wall faces)
interface-rotor-inlet (common face between rotor and stator in the inlet)
interface-rotor-outlet (common face between rotor and stator in the outlet)
interface-estator-inlet (common face between rotor and stator in the inlet)
interface-estator-outlet (common face between rotor and stator in the outlet)
pressure-inlet
pressure-outlet

The warning i got in fluent was the following:

********************* WARNING ******************************************
************************************************** **********************
** Following mesh operations failed:
** Rename Zone wall to wall-exterior (Failed)
** Following expected zones were not found in the current mesh:
** part-solid
** wall-part-solid
** interior-part-solid
** interface-outlet
** interface-inlet
** wall-exterior
** Found Following new zones in the current mesh:
** interior-fluid-estator
** interior-fluid-rotor
** wall-estator
** wall-rotor
** interface-rotor-outlet
** interface-rotor-inlet
** interface-estator-inlet
** interface-estator-outlet
** fluid-estator
** fluid-rotor
**
** Please ensure that your current Setup is valid.
************************************************** **********************
************************************************** **********************

Should i change the named selections?

flotus1 August 4, 2012 15:06

All right, one last try. In the Fluent GUI, click on "mesh" -> "replace mesh" and select the mesh you just created.

msatrustegui August 20, 2012 06:58

Quote:

Originally Posted by flotus1 (Post 375392)
All right, one last try. In the Fluent GUI, click on "mesh" -> "replace mesh" and select the mesh you just created.

Iīve also try that, but it's still getting me to the same problem. I donīt know how to define the named selections in the meshing part.

msatrustegui August 20, 2012 07:09

1 Attachment(s)
In this reply i've attached the file i'm working with. As i said before, my problem is that i donīt know how to define the named selections.

The model is divided in one part consisting of three bodies (all stationary) and one body (the rotating one).

The interior is fluid (air).

Thanks for the support.

flotus1 August 20, 2012 10:08

Your zip-folder only contains the project-file, not the corresponding directory.

msatrustegui August 21, 2012 03:13

Quote:

Originally Posted by flotus1 (Post 377801)
Your zip-folder only contains the project-file, not the corresponding directory.

I canīt upload the rest of the files, they're too big.


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