FEM Mesh Region

[akhavr]

Hello, newbie here.

I'm working on the FEM composite tutorial and got issues.

At first, I've thought that something is wrong with my model, but I've downloaded this file

UPDATED ATTACHMENT:
BIM(2).fcstd

..and still get message

FEM mesh has neither volume nor shell or edge elements. Provide a FEM mesh with elements!

Here's my system information:

OS: Ubuntu 16.04.6 LTS
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.16146 (Git) AppImage
Build type: Release
Branch: (HEAD detached at 0.18.4)
Hash: 980bf9060e28555fecd9e3462f68ca74007b70f8
Python version: 3.6.7
Qt version: 5.6.2
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: Ukrainian/Ukraine (uk_UA)

$ ~/gmsh-4.5.6-Linux64/bin/gmsh -info
Version : 4.5.6
License : GNU General Public License
Build OS : Linux64
Build date : 20200330
Build host : gmsh.info
Build options : 64Bit ALGLIB Ann Bamg Blas[custom] Blossom Cgns DIntegration Dlopen DomHex Fltk Gmm Hxt Hxt3D Jpeg[fltk] Kbipack Lapack[custom] LinuxJoystick MathEx Med Mesh Metis Mmg3d Mpeg Netgen ONELAB ONELABMetamodel OpenCASCADE OpenCASCADE-CAF OpenGL OptHom Parser Plugins Png[fltk] Post QuadTri Solver TetGen/BR Voro++ Zlib
FLTK version : 1.4.0
OCC version : 7.3.1
MED version : 4.0.0
Packaged by : geuzaine
Web site : http://gmsh.info
Issue tracker : https://gitlab.onelab.info/gmsh/gmsh/issues

What I'm doing wrong?

[bernd]

would you post the FreeCAD file or an link to the file you have problem with.

[akhavr]

would you post the FreeCAD file or an link to the file you have problem with.

It's exactly the one, that was used in the tutorial and was posted in this thread previously: https://forum.freecadweb.org/download/file.php?id=52497

[bernd]

would you post the FreeCAD file or an link to the file you have problem with.

It's exactly the one, that was used in the tutorial and was posted in this thread previously: https://forum.freecadweb.org/download/file.php?id=52497

works great here

- deactivate group meshing in FEM prefs
- load the file
- double click on mesh object
- mesh

Code: Select all

Active analysis found: Analysis
Active analysis found: Analysis
  ElementDimension: 3
  No Group meshing for analysis.
  Mesh regions, we need to get the elements.
  {'Solid1': 5.0, 'Solid2': 1.0}
  {'Solid1': [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15], 'Solid2': [8, 9, 10, 11, 13, 12, 14, 15]}
  C:/Users/BHA/Downloads/BIM(2)\FEMMeshGmsh\CompoundFilter_Geometry.brep
  C:/Users/BHA/Downloads/BIM(2)\FEMMeshGmsh\CompoundFilter_Mesh.unv
  C:/Users/BHA/Downloads/BIM(2)\FEMMeshGmsh\shape2mesh.geo
  C:/0_BHA_privat/progr/Gmsh/gmsh.exe
  New mesh was added to the mesh object.
Clean run of Gmsh

- right click on mesh object --> mesh info

Code: Select all

========================== Dump contents of mesh ==========================

1) Total number of nodes:      	2476
2) Total number of edges:      	84
3) Total number of faces:      	510
4) Total number of polygons:   	0
5) Total number of volumes:    	1755
6) Total number of polyhedrons:	0

7) Total number of linear edges:	0
8) Total number of linear faces:	0
9) Total number of linear volumes:	0

10) Total number of quadratic edges:	84
11) Total number of quadratic faces:	510
11.1) Number of quadratic triangles:  	510
11.2) Number of quadratic quadrangles:	0
12) Total number of quadratic volumes:	1755
12.1) Number of quadratic hexahedrons: 	0
12.2) Number of quadratic tetrahedrons:	1755
12.3) Number of quadratic prisms:      	0
12.4) Number of quadratic pyramids:    	0

===========================================================================

1755 tet10

Code: Select all

OS: Windows 10 (10.0)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.21068 (Git)
Build type: Release
Branch: master
Hash: 92fe9adebbff910c5a10d6230785a6b58935b677
Python version: 3.6.8
Qt version: 5.12.1
Coin version: 4.0.0a
OCC version: 7.3.0
Locale: German/Switzerland (de_CH)

screen.png (581.91 KiB) Viewed 1040 times

[akhavr]

Thanks. This time it worked. Either "group meshing" was turned on in my FEM prefs, or I misunderstood UI actions necessary to do the mesh.

[lightshah]

I am newbie here and I try to follow the tutorial but ended up with 'FEM mesh has neither volume nor shell or edge elements. Provide a FEM mesh with elements!'

compst_shear.FCStd

(16.15 KiB) Downloaded 31 times

is there something i missed?

[jmaustpc]

is there something i missed?

Hi, welcome to FreeCAD.

I don't know much about the details of FEM, but I do know you need the latest FreeCAD 0.19, please post your version data in the manner explained in the forum rules links above.

OS: Ubuntu 18.04.5 LTS (KDE/plasma)
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.19.
Build type: Release
Branch: unknown
Hash: c240777a7de9fbb69472e6cbf589e83559a9ef17
Python version: 3.6.9
Qt version: 5.9.5
Coin version: 4.0.0a
OCC version: 7.5.1
Locale: English/Australia (en_AU)

[lightshah]

Hi, welcome to FreeCAD.

I don't know much about the details of FEM, but I do know you need the latest FreeCAD 0.19, please post your version data in the manner explained in the forum rules links above.

Thank you for your reply

Nice features FreeCAD have. I am planning to learn mechanical FEM then that temperature and electromagnetics features .

It turned out I am using 0.18. I thought I had the newest version from ubuntu repository. I will update later after I make some progresses.

Always nice to have this kind of community.

OS: Ubuntu Core 16
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.18.16093 +53 (Git)
Build type: Unknown
Branch: 0.18.4
Hash: 980bf9060e28555fecd9e3462f68ca74007b70f8
Python version: 3.5.2
Qt version: 5.5.1
Coin version: 4.0.0a
OCC version: 7.4.0
Locale: English/UnitedStates (en_US)