[Hectux]

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

[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

[tomislav_maric]

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

[Hectux]

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.

[paulo]

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.