CFD Online URL
[Sponsors]
Home > Forums > OpenFOAM Mesh Utilities

Dimensions in Salome

Register Blogs Members List Search Today's Posts Mark Forums Read

Like Tree2Likes
  • 1 Post By santos
  • 1 Post By paulo

Reply
 
LinkBack Thread Tools Display Modes
Old   April 8, 2009, 09:29
Default Dimensions in Salome
  #1
New Member
 
Join Date: Mar 2009
Posts: 28
Rep Power: 7
Hectux is on a distinguished road
Hi,

I am trying now to create my meshes with Salome-Meca.

My problem is: Where can I see the dimmension I am working with?
Is it Meters or Millimeters? Where can I change them?
What happens with the dimension when I convert it into OpenFoam via UNV file?


Thanks a lot.
Best regards
Hectux is offline   Reply With Quote

Old   April 8, 2009, 10:33
Default
  #2
Senior Member
 
santos's Avatar
 
Jose Luis Santos
Join Date: Mar 2009
Location: Portugal
Posts: 212
Rep Power: 8
santos is on a distinguished road
Send a message via Skype™ to santos
Hi,

I think Salome uses SI units, so you get your dimensions in metres by default.

I normally scale my mesh after converting to OpenFOAM format with:

transformPoints -scale '(1e-3 1e-3 1e-3)'

The last argument is the vector you use to scale your points. In this case, it converts your points from m to mm.

Regards,
Jose Santos
Annier likes this.
santos is offline   Reply With Quote

Old   April 8, 2009, 10:41
Default
  #3
Senior Member
 
Tomislav Maric
Join Date: Mar 2009
Location: Darmstadt, Germany
Posts: 251
Blog Entries: 5
Rep Power: 10
tomislav_maric is on a distinguished road
I'm also using Salome to generate CAD geometry for multi component wings, and I'm wondering how does Salome calculate Inertial properties (Inertia tensor). I've asked this on Salome forum but got no answer. If I generate a split airfoil and extrude it in a shell object, it has no thickness. Material properties are also not defined (unlike in other commercial CAD software). Still, Inertia tensor components are generated. Do I calculate real values by multiplying the given ones with real density in kg/m^2 (here I presume that this value is preset to 1 in Salome since I'm unable to find where the material properties are defined.). ANY advice is greatly appreciated.

Tomislav
tomislav_maric is offline   Reply With Quote

Old   April 8, 2009, 13:57
Default Netgen or Salome?
  #4
New Member
 
Join Date: Mar 2009
Posts: 28
Rep Power: 7
Hectux is on a distinguished road
Ok. Thanks. I will play a bit with this.

But I also have another question.

At the Moment I am making my geometry with Salome.
Save it as STEP file. Mesh it with Netgen --> Save as NetgenNeutral and convert it via netgenNeutralToFoam.

Works good for my work.

My question is: When I mesh a simple geometry e.g. a pipe (cylinder). Netgen needs only a few seconds for it.
When I try to mesh the same geometry with Salome-Meca, it takes the whole morning and afterwards I run out if memory:
Error in the terminal: "Lack of memory"
Error in Salome: "Memory allocation problem"

As Algorithm I use Netgen 1D-2D-3D.
Hectux is offline   Reply With Quote

Old   April 11, 2009, 08:25
Default
  #5
Member
 
Paulo Alexandre Costa Rocha
Join Date: Mar 2009
Posts: 71
Rep Power: 7
paulo is on a distinguished road
Hi all,

We've been using Salome for a while, and we have some experiences we can share:

- Salome uses milimeters: Then if you model a 1x1x1m cube, mesh it and export to OF using UNV format (Salome doesn't retain the dimensions info), the cube will be 1000x1000x1000, that OF reads in meters. You'll have to use transformPoints or create it in Salome with 1x1x1mm;

- Salome works well with complex geometries since you use tet meshes. We tried a lot of hex mesh options in a imported geometry (STEP format), but unsuccessful;

- Salome is quite memory eater (maybe because of the GUI). So if your HD starts blinking, stop the process and change the quality settings or wait a whole week. Increasing the RAM is also a good option. You can monitor the processes using CTRL-ESC;

- There is a newer version in the site www.salome-platform.org . We didn't try it yet, but I hope something about the hex meshes is fixed/improved;

Sorry for the bad english.

Regards,

Paulo.
Annier likes this.
paulo is offline   Reply With Quote

Old   October 29, 2013, 02:04
Default Thank you
  #6
New Member
 
annier
Join Date: Jun 2013
Posts: 27
Rep Power: 2
Annier is an unknown quantity at this point
Quote:
Originally Posted by paulo View Post
Hi all,

We've been using Salome for a while, and we have some experiences we can share:

- Salome uses milimeters: Then if you model a 1x1x1m cube, mesh it and export to OF using UNV format (Salome doesn't retain the dimensions info), the cube will be 1000x1000x1000, that OF reads in meters. You'll have to use transformPoints or create it in Salome with 1x1x1mm;

- Salome works well with complex geometries since you use tet meshes. We tried a lot of hex mesh options in a imported geometry (STEP format), but unsuccessful;

- Salome is quite memory eater (maybe because of the GUI). So if your HD starts blinking, stop the process and change the quality settings or wait a whole week. Increasing the RAM is also a good option. You can monitor the processes using CTRL-ESC;

- There is a newer version in the site www.salome-platform.org . We didn't try it yet, but I hope something about the hex meshes is fixed/improved;

Sorry for the bad english.

Regards,

Paulo.
Thank you for your illustrative explanation.
Annier is offline   Reply With Quote

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
SimpleFoam error with mesh imported from salome matteo OpenFOAM Running, Solving & CFD 9 January 2, 2008 05:04
Different dimensions for FATAL ERROR retech OpenFOAM Running, Solving & CFD 2 August 14, 2007 11:17
Dimensions of laplacian in PISO loop kumar2 OpenFOAM Running, Solving & CFD 2 July 3, 2006 15:34
How to change the dimensions in STAR-CD? Particle CD-adapco 5 April 23, 2006 11:16
SOURCE DIMENSIONS Andreas Abdon CFX 1 March 13, 2000 11:51


All times are GMT -4. The time now is 07:33.