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poor convergence in MEMS electromechanical switch

Greetings: This is a grossly simplified form of a 3D model I'm doing of an electromechanical switch using the MEMS module. There's a cantilever which is at zero bias, a "gate" electrode which is biased...

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how to realize convergence in highly doped semiconductor in COMSOL 4.4

I meet the convergence problem when modeling highly doped semiconductor in COMSOL. What I model is a P-n heterojuction, the concentration of the acceptor is 1e18/cm3, the concentration of the donor is...

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Evaluating the L2 and H1 norm of the difference of two solutions on different...

I did not find any help on this topic on the web, so I thought I should publish my simple results: When working with FEM-models it is necessary to check grid-convergence of the solution. The L2-norm...

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convergence speed

Hello, In some previous FEA software I looked at, there was an option to limit the degrees of freedom to speed up solution times. In a 3D model for example, one could only look at movement along the y...

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Convergence: when should I stop the model?

Hi everyone I have been working on models that take several days to solve. One of them is running at the moment, and I just have a general question. When I look at the Convergence Plot 2, which is...

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What is convergence?

I'd just like to know what convergence is - in the context of COMSOL.

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Error in inductor modelling with Magnetic fields interface

Dear all, I'm using the Magnetic fields interface on an inductor model I'm currently working on. The idea is to do a multiphysics coupling with Heat transfer in solids so that I can compare it with...

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peristaltic pump model convergence

Hello, I am working on a model that is similar to the peristaltic pump model available in the “model gallery”. I would like to use this example to present my problem. The peristaltic pump model does...

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Convergence plots

Does anyone know if it is possible to show a convergence plot during a livelink with Matlab? I'm using version 4.4 and matlab R2013a. Thanks

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"Conjugate Heat transfer" failed to converge if a fluid is included.

A cylinder with a cavity filled with water is the geometry. At the beginning, the outer wall hast a temperature different from the contents."Conjugate Heat transfer" is used to model the thermal...

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How can I manage individual cell values of a mesh in a convergence process?

Using module Semiconductors for computing Electric Potential for a certain geometry, sometimes during convergence process one can observe how few cells close to both exterior limits of a domain and...

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Silicon waveguide convergence value?

Hello. I am studying silicon waveguide using RF module in COMSOL 4.2a version. My questions are what is the convergence in COMSOL multiphysics? is it fine that I got the convergence value which is...

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Deformed geometry model converges until I try to use the lagrange multiplier

Hi all, I'm trying to model the growth of a cavity in a block of ice in response to a flow of hot air. I have a model that works fairly well, with conjugate heat transfer and a deformed geometry to...

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Model convergence dependent on mesh quality, confused!

Hi all, My COMSOL model only solves when the mesh size is "above" the predefined Normal size. When I increase the mesh resolution to "Fine" or higher, the step BiCGStab in the progress tab stalls at...

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Different convergence requirement (relative tolerance) for different...

I am working on a time-dependent model that couples two different physics branches. If I disable the second branch in the time-dependent solver, I can get a solution to converge with a relative...

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Geometry Units and Convergecne

Hello, Does anyone know why changing the "geometry unit" raises convergence issues? For instance, when I change mm to cm, while all other parameters are the same, simulation diverges! Thank you in...

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Periodic Stimulation of Electric Currents Interface

Hello, I am trying to simulate an electrode with a periodic biphasic square pulse through a periodic piecewise function to stimulate it. The piecewise goes between 1, -1 and 0 and I multiply it by my...

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cfd simulation

Hello everybody! I would like to know what is the residual and tolerance factors, in the tab solver/fully coupled. How can we change them in order for the solution to converge? Thanks in advance.

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Solution is not converging for solar cell problem.

Hello everyone, I'm trying to simulate a solar cell with four layers, and I got success with the one dimensional problem. But when I tried the same in two dimensions, the solution is not converging....

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poor convergence in MEMS electromechanical switch

Greetings: This is a grossly simplified form of a 3D model I'm doing of an electromechanical switch using the MEMS module. There's a cantilever which is at zero bias, a "gate" electrode which is biased...

View Article
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