Hello Elmer-Users,
I am new to Elmer and I ran into a problem.
I am trying to carry out an electrostatic simulation on a microstrip configuration, which is typical in PCB applications.
It consists of a substrate layer and a conductor sitting on top. The lower boundary of the substrate layer was set to a
potential of 0 and the conductor boundary was set to a potential of 1.
Meshing was carried out with gmsh.
As you can see from the attached Paraview screenshot there does not seem to be any connection between the conductor and the substrate layer.
I also attached the Elmer project files.
Can anybody help me with my project ?
Electrostatic: Microstrip
Electrostatic: Microstrip
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- Microstrip.zip
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- microstrip.png
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Re: Electrostatic: Microstrip
Hi,
I suspect that the meshes for the two bodies are not connected. You can check that by zooming to the interface in gmsh. The problem should be solvable in gmsh - I think you have to give a coherence command before meshing. You might ask on the gmsh mailing list if the problem persists.
Or else you switch to Salomé and do a partition before meshing.
HTH,
Matthias
I suspect that the meshes for the two bodies are not connected. You can check that by zooming to the interface in gmsh. The problem should be solvable in gmsh - I think you have to give a coherence command before meshing. You might ask on the gmsh mailing list if the problem persists.
Or else you switch to Salomé and do a partition before meshing.
HTH,
Matthias
Re: Electrostatic: Microstrip
Thanks for the fast reply.
I will have a look at my mesh in gmsh.
I will have a look at my mesh in gmsh.
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Re: Electrostatic: Microstrip
Confirmed coincident nodes at the boundary between the bodies.
ElmerGrid 14 2 mesh.msh -merge 1.E-6
converted the mesh and merged the coincident nodes
ElmerGrid 14 2 mesh.msh -merge 1.E-6
converted the mesh and merged the coincident nodes
Re: Electrostatic: Microstrip
Coherence did the trick... I managed to modify the mesh in gmsh and after that
I got the result I expected.
This is very interesting:
How did you find about the coincident nodes?
The results obtained with this method and the results obtained by modification of the mesh
in gmsh are the same.
I got the result I expected.
This is very interesting:
A very fast and easy method to modify and correct the mesh.kevinarden wrote: ↑13 Nov 2019, 19:02 Confirmed coincident nodes at the boundary between the bodies.
ElmerGrid 14 2 mesh.msh -merge 1.E-6
converted the mesh and merged the coincident nodes
result.png
How did you find about the coincident nodes?
The results obtained with this method and the results obtained by modification of the mesh
in gmsh are the same.
-
- Posts: 2301
- Joined: 25 Jan 2019, 01:28
- Antispam: Yes
Re: Electrostatic: Microstrip
I have had the coincident node problem several times before. i use salome now which will merge coincident nodes. But in researching ElmerGrid I also found the flag -merge that will also merge nodes on conversion.
Re: Electrostatic: Microstrip
Hi,
Since beginning I have been using Salome software for constructing mesh, and had never been through this problem.
It is nice to know that ElmerGrid has interface to convert externally created mesh into ElmerSolver compatible mesh.
Yours Sincerely,
Anil Kunwar
Since beginning I have been using Salome software for constructing mesh, and had never been through this problem.
It is nice to know that ElmerGrid has interface to convert externally created mesh into ElmerSolver compatible mesh.
Yours Sincerely,
Anil Kunwar
Anil Kunwar
Faculty of Mechanical Engineering, Silesian University of Technology, Gliwice
Faculty of Mechanical Engineering, Silesian University of Technology, Gliwice
Re: Electrostatic: Microstrip
Thanks for the update...I will give Salome a trykevinarden wrote: ↑14 Nov 2019, 00:01 I have had the coincident node problem several times before. i use salome now which will merge coincident nodes. But in researching ElmerGrid I also found the flag -merge that will also merge nodes on conversion.