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Electrostatic Membrane deflection, electrode placement errors
Posted Jun 22, 2010, 12:45 p.m. EDT 1 Reply
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Hi All,
I am modeling a 2D simplified cMUT device. I am starting with a simple fixed-fixed beam with electrodes (1) at the top of the beam/membrane (Electric Potential), and (2) at the surface of the contact (Ground).
It is essentially the same as the example COMSOL model **2D Cantilever Beam, MEMS Actuator**, except with some modifications.
******My problem is:*******
When I modify this COMSOL example model by fixing both ends of the beam and placing the Electric Potential at the top of the beam (the example model has it at the bottom), I receive errors and the solution does not converge.
Just a guess, but I've noticed that the difference between my model and the original COMSOL model are the "Exterior electric Maxwell Stress tensors", and "Surface Charge Density" equations, with respect to which boundary has an electric potential and which one does not (these equations can be found in Equation Systems > Boundary Settings > Variables ).
Basically, I just want to run the model with the electrode on top of the membrane, as this is how a cMUT device is usually designed. Any suggestions would be great!!
I am modeling a 2D simplified cMUT device. I am starting with a simple fixed-fixed beam with electrodes (1) at the top of the beam/membrane (Electric Potential), and (2) at the surface of the contact (Ground).
It is essentially the same as the example COMSOL model **2D Cantilever Beam, MEMS Actuator**, except with some modifications.
******My problem is:*******
When I modify this COMSOL example model by fixing both ends of the beam and placing the Electric Potential at the top of the beam (the example model has it at the bottom), I receive errors and the solution does not converge.
Just a guess, but I've noticed that the difference between my model and the original COMSOL model are the "Exterior electric Maxwell Stress tensors", and "Surface Charge Density" equations, with respect to which boundary has an electric potential and which one does not (these equations can be found in Equation Systems > Boundary Settings > Variables ).
Basically, I just want to run the model with the electrode on top of the membrane, as this is how a cMUT device is usually designed. Any suggestions would be great!!
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1 Reply Last Post Jun 22, 2010, 8:00 p.m. EDT
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Posted:
1 decade ago
For anyone else with a similar problem, refer to this link...
www.comsol.com/community/forums/general/thread/2525/
www.comsol.com/community/forums/general/thread/2525/