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Problem in meshing small structures
Posted Apr 30, 2010, 10:50 a.m. EDT RF & Microwave Engineering Version 5.2 3 Replies
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Hi,
I have waveguide whose length is 70 um, textured with periodic gratings (square pattern) having height gradually varying from one amstrong to one nanometer. Apparently, this is causing problems for the mesh generator and it always gives me the error in advancing front mesher. Any tips on how to get around this problem?
Ideally, I would like a way out in which mesh density is increased only around the grating and not the whole computational field of view so as to keep the computational burden from unnecessarily increasing.
Thanks
I have waveguide whose length is 70 um, textured with periodic gratings (square pattern) having height gradually varying from one amstrong to one nanometer. Apparently, this is causing problems for the mesh generator and it always gives me the error in advancing front mesher. Any tips on how to get around this problem?
Ideally, I would like a way out in which mesh density is increased only around the grating and not the whole computational field of view so as to keep the computational burden from unnecessarily increasing.
Thanks
3 Replies Last Post Jul 13, 2010, 9:15 a.m. EDT
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Posted:
1 decade ago
Just to add the error message I am getting. Note that the coordinate point being mentioned is approximately the same point where groove starts and it is hence a (unrounded) corner
Exception:
com.femlab.jni.FlNativeException: Internal error advancing front mesher
Messages:
Internal error advancing front mesher
Failed to generate mesh for subdomain
- Subdomain: 1
Stack trace:
at afmesh.cpp, row 424, (No candidate point found near (5.22661e-06, -5.41484e-08))
at mesh2init.cpp, row 1116, ()
at com.femlab.mesh.Mesh.init(Native Method)
at com.femlab.mesh.Mesh.init(Unknown Source)
at com.femlab.mesh.MeshInitRunnable.run(Unknown Source)
at com.femlab.server.FlRunner.run(Unknown Source)
at com.femlab.util.i.run(Unknown Source)
at com.femlab.util.ae.run(Unknown Source)
Exception:
com.femlab.jni.FlNativeException: Internal error advancing front mesher
Messages:
Internal error advancing front mesher
Failed to generate mesh for subdomain
- Subdomain: 1
Stack trace:
at afmesh.cpp, row 424, (No candidate point found near (5.22661e-06, -5.41484e-08))
at mesh2init.cpp, row 1116, ()
at com.femlab.mesh.Mesh.init(Native Method)
at com.femlab.mesh.Mesh.init(Unknown Source)
at com.femlab.mesh.MeshInitRunnable.run(Unknown Source)
at com.femlab.server.FlRunner.run(Unknown Source)
at com.femlab.util.i.run(Unknown Source)
at com.femlab.util.ae.run(Unknown Source)
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Posted:
1 decade ago
Hello,
I have exactly the same problem :(...
Did you succeed to find any solution to your problem?
Thanks a lot!
I have exactly the same problem :(...
Did you succeed to find any solution to your problem?
Thanks a lot!
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Posted:
1 decade ago
A bit, not what I wanted on the whole though.
In 3.5, go to free mesh parameters (press F9). Switch to Subdomain tab, select the subdomains you want to mesh and then select option "Triangle" in method field. You will need to specify other two entries about maximum element size and growth rate. I don't remember exactly their significance so either read in the manual or just set the growth rate to 1 and intuitively set something for maximum mesh size. Now press the "mesh selected" button and that will do the job without using advancing front mesh algorithm which was giving you error.
This way you could mesh the whole of your geometry quite comfortably, I hope.
All the best
In 3.5, go to free mesh parameters (press F9). Switch to Subdomain tab, select the subdomains you want to mesh and then select option "Triangle" in method field. You will need to specify other two entries about maximum element size and growth rate. I don't remember exactly their significance so either read in the manual or just set the growth rate to 1 and intuitively set something for maximum mesh size. Now press the "mesh selected" button and that will do the job without using advancing front mesh algorithm which was giving you error.
This way you could mesh the whole of your geometry quite comfortably, I hope.
All the best