Different mesh in FC and ElmerGUI

[HoWil]

Hello,
I did write some advertising for FC-FEM and elmer-integration in the elmer-forum (see http://elmerfem.org/forum/viewtopic.php ... ac0d10b91f ).
After uploading the images showing the generated mesh in FC, in ElmerGUI and in Paraview I realized that the depicted mehes are a bit different but can not explain why. Please have a look especially at the mesh at the hole in the middle of the plate:

and compare with the mesh shown in ElmerGUI:

Everything looks back to normal when viewing the results (of the simulation run within ElmerGUI) with paraview:


Any hints why the mesh in FC looks somehow in between the coarse mesh shown in ElmerGUI and the mesh exported by Elmer visualized with paraview? Is this simply a visualization problem or is this related to the group I introduced at the inner face of the hole?

The models can be found on the Elmer-forum: http://elmerfem.org/forum/viewtopic.php ... 91f#p17443

Thanks in advance,
HoWil

[Christoph]

I would guess Elmergui is just not able to visualize second order meshes correctly respectively middle nodes located on curved geometries. If showing node numbers in Elmergui, every edge has a middle node. So everything is fine. Remeshing the mesh in FreeCAD as 1st order, the mesh looks a bit like the one in Elmergui.

[polymer]

In Elmer GUI go to:

View -> Shade Model -> Smooth

And all is fine.

[HoWil]

I would guess Elmergui is just not able to visualize second order meshes correctly respectively middle nodes located on curved geometries.

And all is fine.

Excellent! Thx to both of you for your detailed help
BTW.: I am extraordinary positively surprised to see some elmer experts in this forum.

Maybe we should make a poll about which fem software a usual FC-FEM user uses beside FC.

BR, Wilfried

[Christoph]

In Elmer GUI go to:

View -> Shade Model -> Smooth

And all is fine.

mhhh, does not work using Elmer 8.3 on Windows 10. I can not see any change using this command.

I am playing around with following software packages:

- FreeCAD
- Salome Meca
- Elmer
- LibreCAD (no simulation, but quite a nice software and I like using it. 3d is fine, but not always necessary)
- Mecway (not open source, in the past it cost 100 dollar, but now 350 dollar - it is highly usable and I like it pretty much (uses CalculiX too))
- Agros2d (excellent software, and often 2d is absolutely sufficient to do the job)
- Z88 Aurora / Arion
- Calculix Launcher from Calculix09 on Youtube (doesn't look nice but works very fine and can perform amazing things (https://www.youtube.com/user/calculix09 ... _polymer=1))

During Christmas, I hope to find some spare time to give a try on Code Saturn...

[thschrader]

In Elmer GUI go to:

View -> Shade Model -> Smooth

And all is fine.

mhhh, does not work using Elmer 8.3 on Windows 10. I can not see any change using this command.

I am playing around with following software packages:

- FreeCAD
- Salome Meca
- Elmer
- LibreCAD (no simulation, but quite a nice software and I like using it. 3d is fine, but not always necessary)
- Mecway (not open source, in the past it cost 100 dollar, but now 350 dollar - it is highly usable and I like it pretty much (uses CalculiX too))
- Agros2d (excellent software, and often 2d is absolutely sufficient to do the job)
- Z88 Aurora / Arion
- Calculix Launcher from Calculix09 on Youtube (doesn't look nice but works very fine and can perform amazing things (https://www.youtube.com/user/calculix09 ... _polymer=1))

During Christmas, will hope to find some spare time to give a try on Code Saturn...

Lifer doch malei
Can you give an example?

[Christoph]

Let's try your wall from here (quick and dirty): https://forum.freecadweb.org/viewtopic. ... 30#p199127

Temperature distribution in Agros2d:


Temperature distribution as diagramm, also in Agros2d:


I used your values regarding thermal conductivity, but as film coefficient 25 W/(m²K) on the cold side and 7,6924 W/(m²K) on the warm side.

Here the file: https://www.dropbox.com/s/u5jbmsmm3fomtj0/wall.a2d?dl=0

Update: sorry, used different temperatures too: warm side 293.15 K and cold side 290.65 K

[thschrader]

@Christoph: thanks for the calculation,
please see here
https://forum.freecadweb.org/viewtopic. ... 1&start=30

[bernd]

I would guess Elmergui is just not able to visualize second order meshes correctly respectively middle nodes located on curved geometries. If showing node numbers in Elmergui, every edge has a middle node. So everything is fine. Remeshing the mesh in FreeCAD as 1st order, the mesh looks a bit like the one in Elmergui.

Guys for your information. FreeCAD see code what uses FreeCAD to display a FEM mesh. https://github.com/FreeCAD/FreeCAD/blob ... 1054-L1066