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-   -   [DesignModeler] 2-D meshing for Fluent in Ansys 12 (http://www.cfd-online.com/Forums/ansys-meshing/68108-2-d-meshing-fluent-ansys-12-a.html)

fade September 7, 2009 10:27

2-D meshing for Fluent in Ansys 12
 
Hi; our setup just got updated, and now there is no Gambit. I'm trying to make a relatively simple 2-D mesh, but I'm having a lot of trouble. I imported some coordinate points, and then used the DM 'design from points' command to create the lines. I tried creating surfaces, and then meshing them, but the mesher won't let me set boundary conditions or change materials, and Fluent reads in the mesh with negative volumes. Does anyone have any suggestions for how to make a 2-D mesh?

thanks a lot.

PSYMN September 8, 2009 10:58

Analysis type = 2D
 
On the right hand side of the project page (or by right clicking on geometry to get "properties"), make sure that "Advanced Geometry Options => Analysis type is set to 2D (default is 3D). Also, make sure that you made your model in the XY plane and Z = 0.

Maldoror September 16, 2009 18:16

Geomety 2D in ANSYS 12.0
 
hi.
I am working with ANSYS 12.0. I made a 2D geometry in the application DesignModeler, but when I load the geometry in the Meshing application, see "? geometry" in the outline tree.
How do I make a 2D geometry?
I do so that the geometry is identified by the Meshing application?
thank you.

PSYMN September 17, 2009 10:02

back on the project page.
 
As I last said, go to the project page (before opening ANSYS Meshing), right click on the geometry field and select properties from the pulldown. On the right side a table of properties will pop up and you can make sure that Analysis type is set to 2D...

Simon

Maldoror September 17, 2009 14:20

Thank you Simon.

ksguntur November 10, 2009 13:58

Same trouble
 
Hi

I was having the same trouble. I changed the analysis type to 2D but it still does not work. The mesher open and then closes. the error messages in the workbench window says "plugin error: no valid bodies found"

Can any one help please.

Thanks
Krishna.

ksguntur November 10, 2009 18:32

Never Mind. I figured it out. Turns out I was doing it wrong.

kousis November 17, 2009 13:13

to ksguntur:

i get the same thing. what were you doing wrong?

ksguntur November 17, 2009 13:15

I was not actually creating the surface. I sketched it and tried to mesh it. I had to go to concept, create surface from sketch, generate and then try it. Make sure the analysis type is 2D.

kousis November 17, 2009 14:15

Thanks ksguntur!

dynamicdom November 30, 2009 04:30

hey , my situation:

i made a surface in the desing modeler,meshed it as a 2d plate in the ansys 12 mesher .afterwards i wanted to set boundary conditions for in-/outlet of my streaming channel with a gasket in it.

the point is that i can't set boundary conditions for in-/and outlet.

where can i define inlet/outlet(just edges, because of 2d)?

hope anyone can help me...

regards

kingjewel1 November 30, 2009 16:52

Quote:

Originally Posted by dynamicdom (Post 238128)
hey , my situation:

i made a surface in the desing modeler,meshed it as a 2d plate in the ansys 12 mesher .afterwards i wanted to set boundary conditions for in-/outlet of my streaming channel with a gasket in it.

the point is that i can't set boundary conditions for in-/and outlet.

where can i define inlet/outlet(just edges, because of 2d)?

hope anyone can help me...

regards

Define your Boundaries in the mesher first. As far as I remember CFX allows you to define them in Pre but fluent doesn't-

PSYMN December 1, 2009 01:15

Named Selections.
 
Named selections are the key to CFD boundary conditions in workbench. This is the same for 2D or 3D, except that you apply them to edges instead of faces.

You can do it in DM or the ANSYS Meshing app.

Use the edge selection tool to select the edge (such as the inlet), then right click and choose the option for creating a named selection... name the selection "INLET" and generate...

Then repeat for other important ones. you don't need named selections for walls.

Simon

dynamicdom December 2, 2009 05:25

thank you two for your help!:)

just-right December 23, 2009 13:40

Fluid Flow CASE (FLUENT) in the WORKBENCH

I tried the earlier mentioned tips, however I still get the error:

PlugIn Error: No Valid Bodies Found

I imported a sketch as *.CatPart (Catia V5) I generated a surface in DM. I tried it both with and without the imported sketch, both seem to fail. Any tips?

Thanks in advance

PSYMN December 23, 2009 23:49

Maybe you don't have things set to 2D?
 
Are you sure you are setup for 2D? Look up in the thread for info about how to do that...

just-right December 24, 2009 07:01

It seems the 2-D geometry should be placed on the XY plane. You can import an external geometry created on a different plane, just make sure you import it to the BASE plane XY.

Grid creation in v12 isn't what it should have been though.

SeanQuallen February 3, 2012 00:13

Sorry to dig up an old thread, but I'm having this problem as well. I am using a 2D analysis and my surface/line bodies are in the x-y plane. In fact.. they open up in the meshing module and *then* I get the "PlugIn Error..." message. I can then close the message and continue on as if nothing ever happened. I carry on through the solver and I get results with it so I know it works, but I believe this is causing issues during a project wide update/parametric study.

Any ideas? I'm using 13.0 and I have a very simple airfoil/farfield geometrical setup. I drew it up in DesignModeler and created surfaces. This is driving me nuts so any help would be well appreciated!!

PSYMN February 4, 2012 16:19

I am guessing that the error is what is stopping your parametric study...

You probably need to sort that out first...

jeff.freeman August 20, 2012 20:43

Hi all, I'm new to Workbench (v13.0). I've spent hours trying to apply the suggestions made in this thread to my project, and still have problems. I hope somebody can explain what I'm doing wrong.

I have a text file of point data that is formatted appropriately for the Concept > 3D Curve tool. All of my points are are in the XY plane, with the Z values equal to 0. Marking the "Merge Topology?" option to "Yes", this gives me a Curve1 and single Line Body.

I then use the Concept > Surfaces From Edges tool to create a surface body from those edges. For some reason, I need to manually select all 9 edges from the Model View display. Selecting either the Line Body or the Curve1 from the Tree Outline does not work.

Now I have a Surf2 and a Surface Body, which I set to be a Fluid. After Generating and saving this geometry, I close DM.

Then I ensure that the Analysis Type is set to 2D.

After all of this, I still get the "PlugIn Error: No valid bodies found for 2D Analysis in part Part" error. Any ideas why?

The best reason I can imagine would involve DM only recognizing the 3D Curve as a 3d body, regardless of whether all the points are only in the XY plane.

-Jeff


Edit: I just tried suppressing the Line Body, and it worked! I loaded the geometry into Meshing and it didn't give me an error. Is what I did valid?


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