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More services...Creating & Meshing Assemblies in 4.0
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4 Replies
Last post: June 8, 2010 2:36pm UTC
June 4, 2010 7:23pm UTC
Creating & Meshing Assemblies in 4.0
Hi,
I'm trying to work with assemblies in Comsol 4.0 and I've been unable to use the 'imprint' option to automatically make identity pairs and match mesh nodes. In comsol 3.5a, this was easily implemented by Draw>Create Pairs.
Has anyone had any success automatically creating identity pairs for assemblies and getting the imprint functionality to work? I have been unable to get my mesh to line up in Comsol 4.0 the way "create imprints" worked in Comsol 3.5.
Anyone have any ideas?
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June 5, 2010 10:26am UTC in response to Andrew Prudil
Re: Creating & Meshing Assemblies in 4.0
Hi
In V4 you need to change the Geometry "Finish" function "from union" to "form assembly" and check the create imprints check box.
Thereafter it should be very similar to V3.5a ;)
DO not forget to create your pairs in "Definitions Contact or Identity Pairs" and define the physics in the physics domain add pairs: contact or identity + required item selections, if this i not already done while you set up your model
It's true that one need to search alittle to find back our old habits, and some must be fully renewed in V4
Have fun Comsoling
Ivar
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June 5, 2010 8:30pm UTC in response to Ivar Kjelberg
Re: Creating & Meshing Assemblies in 4.0
Thanks for the reply Ivar,
I have been trying what you have suggested without any luck. Here is a simple example file with mock geometry where this process does not work. Any ideas?
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June 7, 2010 5:51am UTC in response to Andrew Prudil
Re: Creating & Meshing Assemblies in 4.0
Hi
indeed I notice I must set up the identity by hand on you raxample. But as I do not know the materials you want to set there I do not fully understand your case, what I notice is tht you have a potential point of singularity the spiky last triangle at the left top of your sphere you could have 3-4 materials as borders for a sigle thin sharp edge. Not necesarily the best for numerical stability.
the link to a cercle and its tangeant is always delicate, it makes an infinetely sharp element edge
One thing, do you need all boundaries as assembeld ? why not regroup some of your sections after the split, then COMSOl will automatically treat these as "continuity and you will end up with one or two true assembly indentity items
Godd luck
ivar
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June 8, 2010 2:36pm UTC in response to Ivar Kjelberg
Re: Creating & Meshing Assemblies in 4.0
Thank you for the suggestions, Ivar. The geometry in the file I uploaded is not actually the geometry of interest, but a simple example where I think the imprint functionality fails when creating a mesh. If you look at the mesh near the circle, you can clearly see that the mesh nodes are not matched on either side of the boundary as is supposed to be the case for imprints.
After more experimenting I have found that I can make the imprint functionality work on some geometries but fail on others, and I'm not really sure what the difference is. Can you explain to me why the imprint functionality failed around the circle in the uploaded example? When I try other geometries and zoom in on the mesh that is created it appears that they do not work either (geometries without tangents for example)?
Any ideas? Can you direct me to an example in comsol 4.0 where this feature is used successfully?
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