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Posted: 8 years ago 19 févr. 2016, 10:13 UTC−5

For parts of a geometry with a high aspect ratio, which is the case here, you should look into using a swept mesh made of thin elements (Unless the physics preclude it, of course) . Such meshes can be created within COMSOL without the need to import a file. See this blog for an introduction on the topic: http://www.comsol.com/blogs/improving-your-meshing-with-swept-meshes/ . See also the chapter on meshing in the Reference Manual for more in-depth information on meshing techniques. All manuals are accessed through the File > Help >Documentation menu. Best regards, Jeff PS: Yes, it is also possible to switch from second-order elements to first-order elements (That's done on the Discretization tab of the Settings page for the physics in question, available after you're activated it via the View button). But that is not the first thing we would recommend in this situation. For more on this topic, please read the following: http://www.comsol.com/blogs/keeping-track-of-element-order-in-multiphysics-models/ PS2: In some cases, there are "smarter" ways of modeling thin structures than in full 3D. For instance, in structural mechanics one can represent a thin structure as a shell or a plate or a membrane. Similar approaches are available in COMSOL for other physics as well, see for instance formulations for DC currents on surfaces, thin layer assumptions for heat transfer, thin film approximation for fluid flow, etc. These modeling techniques, when appropriate, save enormous amounts of memory and computational time.