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Cone and plate apparatus

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I imported my file (.x_t) in Comsol, is the simulation of a cone and plate apparatus.
The cone rotates in a simple harmonic way on a stationary plate, assuming the angle between the cone and plate is small.
In the plate there is a medium and my goal of this study is to develop a flow model to simulate shear stress patterns.
After importation, I write physics conditions but when I do the mesh, Comsol stop simulation because there is an error in edge 12.
Why? This geometry is imported!
I don't know what to do this simulation because is the first time that I use Comsol but I must do as soon as possible!
Can you help me?
Thank's a lot

Anna Rita (colleague of Stella)



2 Replies Last Post May 12, 2010, 9:14 a.m. EDT

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Posted: 1 decade ago May 11, 2010, 7:41 a.m. EDT
Hi,
The errors in meshing had come up when i was using free mesh. for better results with free mesh try simplifying geometry by removing unwanted nodes etc. else, try using a mapped mesh and start with meshing the edges and move up to subdomains.
hope this helps
leon

Hi, The errors in meshing had come up when i was using free mesh. for better results with free mesh try simplifying geometry by removing unwanted nodes etc. else, try using a mapped mesh and start with meshing the edges and move up to subdomains. hope this helps leon

Ivar KJELBERG COMSOL Multiphysics(r) fan, retired, former "Senior Expert" at CSEM SA (CH)

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Posted: 1 decade ago May 12, 2010, 9:14 a.m. EDT
Hi

I believe it is related to your thin but big shape, and that some of your surfaces are partially cut. You can have a perfectly coherent geometry imported, but still difficulties to mesh it, especially with such large aspect ratios

I would have imported only the 2D cut and meshed it into 3D by a revolved mesh. this makes a "quad/bricks" but you can always make it as "tets" with the mesh conversion.

The other way would be to import it as 1/4 quadrant and mirror it in COMSOL, unfortunately you cannot mirror the mesh, yet

Have fun Comsoling

Ivar
Hi I believe it is related to your thin but big shape, and that some of your surfaces are partially cut. You can have a perfectly coherent geometry imported, but still difficulties to mesh it, especially with such large aspect ratios I would have imported only the 2D cut and meshed it into 3D by a revolved mesh. this makes a "quad/bricks" but you can always make it as "tets" with the mesh conversion. The other way would be to import it as 1/4 quadrant and mirror it in COMSOL, unfortunately you cannot mirror the mesh, yet Have fun Comsoling Ivar