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Revolved mesh in 4.2a it's there with the 3D sweep function
Posted Apr 20, 2012, 2:52 p.m. EDT 3 Replies
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Hello
A few days ago, someone asked about the revolve mesh function, and I complained that it had dissapeared after 3.5.
But that is not true! It's still there but under "sweep" in V4. After a discussion with Sven our local COMSOL office responsble, we tried out the sweep function and here is an example how a revolve can "easily" be generated with a "SWEEP".
Note a quad mesh cannot be swep around if it touches the axis, but that is really because then the QUAD mesh on the axis has a degenerated boundary and two overlapping points, and COMSOL does (in 4.2a) not recognise this mesh and does not transform it automatically to a lower level element tri type
You need to cut your domain into two, not necesarily equal parts, as I have done here.
By clicking on the 3 "Definition View" I hide some of the "air" domain to see the interiour.
To get a more regular mesh, one can pre-mesh some radial edges with i.e. log spaced progression
It's rather evident once you have done it, still it has taken a year for me to discover it ;)
--
Have fun COMSOLing
Ivar
A few days ago, someone asked about the revolve mesh function, and I complained that it had dissapeared after 3.5.
But that is not true! It's still there but under "sweep" in V4. After a discussion with Sven our local COMSOL office responsble, we tried out the sweep function and here is an example how a revolve can "easily" be generated with a "SWEEP".
Note a quad mesh cannot be swep around if it touches the axis, but that is really because then the QUAD mesh on the axis has a degenerated boundary and two overlapping points, and COMSOL does (in 4.2a) not recognise this mesh and does not transform it automatically to a lower level element tri type
You need to cut your domain into two, not necesarily equal parts, as I have done here.
By clicking on the 3 "Definition View" I hide some of the "air" domain to see the interiour.
To get a more regular mesh, one can pre-mesh some radial edges with i.e. log spaced progression
It's rather evident once you have done it, still it has taken a year for me to discover it ;)
--
Have fun COMSOLing
Ivar
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3 Replies Last Post Apr 21, 2012, 4:13 a.m. EDT
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Posted:
1 decade ago
Thank you Ivar!
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Posted:
1 decade ago
I've been using this method for a while and sometimes it's giving me hard times. Specifically, it would sweep first domain just fine but fail on the second domain. The way to go around it is to mesh one face first, then copy mesh to the second face. After that, it sweeps both domains with no problem.
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Posted:
1 decade ago
Hi
Indeed one limitation with a sweep mesh: the start and ending boundary must have the same shape and mesh (COMSOL will make the copy if it manages to identify a similar start and stop boundary, else you must do it by hand and or copy the mesh first. I managed by making my revolution in 2 steps (domains) for the 360° turn, and then meshed one section and defined the start and stopboundaries (of the middle part, COMSOL finished the rest alone)
--
Good luck
Ivar
Indeed one limitation with a sweep mesh: the start and ending boundary must have the same shape and mesh (COMSOL will make the copy if it manages to identify a similar start and stop boundary, else you must do it by hand and or copy the mesh first. I managed by making my revolution in 2 steps (domains) for the 360° turn, and then meshed one section and defined the start and stopboundaries (of the middle part, COMSOL finished the rest alone)
--
Good luck
Ivar