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boundary condition question
Posted Feb 21, 2011, 10:36 a.m. EST Modeling Tools & Definitions, Parameters, Variables, & Functions 1 Reply
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I have a diaphragm welded to the edge of a hollow cylinder. The weld seam is only 50um thick. However in my model the diaphragm and the hollow cylinder share a common boundary which is equal to the thickness of the cylinder wall (300um).
I want comsol to simulate the diaphragm being pinned at its edge but comsol takes it as the diaphragm being pinned across the entire 300um boundary being shared between the cylinder and the diaphragm (look at the image attached for a clearer picture). How do I set up the boundary conditions for this type of problem.
I want comsol to simulate the diaphragm being pinned at its edge but comsol takes it as the diaphragm being pinned across the entire 300um boundary being shared between the cylinder and the diaphragm (look at the image attached for a clearer picture). How do I set up the boundary conditions for this type of problem.
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1 Reply Last Post Feb 21, 2011, 5:26 p.m. EST
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Posted:
1 decade ago
Hi
by default in "union" geometry Finish mode all common interiour boundaries are respecting "continuity". In your case you must either make a small air path of (300-50)um to avoid the common border. Or use assembly mode and cut your boundary at 50um to set an continuity identity pair along the 50 um welded region, and a contact pair for the rest of the common border. But be aware that such contact models require often some fine tuning of the solver
--
Good luck
Ivar
by default in "union" geometry Finish mode all common interiour boundaries are respecting "continuity". In your case you must either make a small air path of (300-50)um to avoid the common border. Or use assembly mode and cut your boundary at 50um to set an continuity identity pair along the 50 um welded region, and a contact pair for the rest of the common border. But be aware that such contact models require often some fine tuning of the solver
--
Good luck
Ivar