Capacitive comb sensor

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I'm trying to simulate a capacitive comb sensor to measure small displacemets. I'm using solid mechanics and eletrostatic physics to simulate this. Dielectric field is air, so i entered the air domain as a Deforming domain in moving mesh. I have applied all the other boundary conditions correctly as well. But i do get errors for some higher displacements of the comb and at the same time it yields results for smaller displacements. I suspect the issue is due to the large deformations of the mesh of air domain. Please help me to get over this.


1 Reply Last Post Jan 31, 2024, 3:55 p.m. EST
Jeff Hiller COMSOL Employee

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Posted: 3 months ago Jan 31, 2024, 3:55 p.m. EST
Updated: 3 months ago Jan 31, 2024, 3:55 p.m. EST

Hello Sanjaya,

Since you did not post your .mph file, we can only guess what the errors you are getting are, let alone what's causing them. With that said, a reasonable guess is that as the displacements get larger some of the elements in the mesh get inverted. This is a fairly common situation with moving meshes. Fortunately, several techniques exist to counter that. The following blog posts, which discuss those techniques, may be helpful to you:

https://cww.comsol.com/confluence/pages/viewpage.action?pageId=258526211

and

https://www.comsol.com/blogs/deformed-mesh-interfaces-rotations-and-linear-translations/

Best,

Jeff

-------------------
Jeff Hiller
Hello Sanjaya, Since you did not post your .mph file, we can only guess what the errors you are getting are, let alone what's causing them. With that said, a reasonable guess is that as the displacements get larger some of the elements in the mesh get inverted. This is a fairly common situation with moving meshes. Fortunately, several techniques exist to counter that. The following blog posts, which discuss those techniques, may be helpful to you: [https://cww.comsol.com/confluence/pages/viewpage.action?pageId=258526211](https://cww.comsol.com/confluence/pages/viewpage.action?pageId=258526211) and [https://www.comsol.com/blogs/deformed-mesh-interfaces-rotations-and-linear-translations/](https://www.comsol.com/blogs/deformed-mesh-interfaces-rotations-and-linear-translations/) Best, Jeff

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