Boundary Variable not being Recognized
I am having a bit of a problem with defining a boundary variable that has a counterpart defined on the model domain but with a different value. For a simple spherical particle, I am modeling the...
View ArticleToo Much Stress & Strain Cause Damages
The release of Windows, rumoured to be called Windows 9 or possibly Windows 8.2, is just a few days away. Here, we'll track the latest leaks and rumours about the update, letting you know what to...
View ArticleMeshing Tiny Thermal Vias
Hi everyone, By using the Joule Heating Modul, I am trying to get the max. temperature around an electronic component. I have studied similar models before; but this time addionally placed several tiny...
View ArticlePiezoelectric Transducers
Hi I am analyzing the signals in piezoelectric transducers. Can somebody help me in finding some of the difficulties I am facing. 1) How could I measure electric potential of the container on which an...
View Articleerror message
I got a message in equation complaint like the picture show, what 's the problem it is? how can I solve it?"Interpolation grid axis values must be sorted in ascending order in each dimension. Error in...
View ArticleTwo Phase Fluid Flow Convergence Error half-way into solution
Hi All, Time dependent solver for Laminar Two-Phase Flow, Level Set crashes half-way through the solution with error message "last time step didn't converge". Do you know what could cause this? The...
View ArticleSolving Self - Consistent Schrodinger and Poisson with MATLAB and COMSOL...
I'm a COMSOL 4.2a user. I need to solve 2D self-consistent Schrodinger and Poisson equation. Thus, I need to feed the potential values and the wavefunctions to the Schrodinger and Poisson equations as...
View ArticleConvergence problem in RF module
I am doing some plasmonics simulation using silver nano particles in comsol. For silver particle convergence is either very very slow or there is no convergence in most cases for some specific...
View ArticleTo demonstrate a "sieve" at the particle tracing module
Hi all, now I'm trying to demonstrate a particle sieve using the particle tracing module. I expected that the particles bigger than the pore size of the sieve could be filtered and stuck on the sieve...
View ArticlePiezoelectric Transducers
Hi I am analyzing the signals in piezoelectric transducers. Can somebody help me in finding some of the difficulties I am facing. 1) How could I measure electric potential of the container on which an...
View ArticleConvergence versus meshing granularity
I have noticed interesting behaviour in my models. If the model will solve using a coarser mesh, it may not solve well using a finer mesh. And although use of the boundary layer tool can reduce the...
View ArticleFilling of a capillary channel
Remco, hi! Have you ever tried to simulate filling of a capillary channel in 3D? I've been trying to do that for some time, but still with no success. Maybe you know how to do that correctly? Regards,...
View ArticleCatching errors in parametric sweeps
Dear all Is there an elegant way to catch errors in large parametric sweeps? E.g.: When varying values of parameters one might well reach a point when convergence (or other) problems are encountered....
View Article"Update scaled absolute tolerance"
About the "Update scaled absolute tolerance" check box. This feature of the Time-dependent solver has been on by default in the last few versions of Comsol. In some models in the Model Library, the...
View Articleproblems with linear projection
Hi all, I developed a model for calculation of AC losses and I am using Linear projection operator to ensure sufficient current flow (Point-wise constraint later). The problem is that my linear...
View ArticleSimulating capacitive device operating at collapse voltage
Hi, I'm trying to simulate an capacitive ultrasound transducer operating at collapse voltage. The model, made of two parallel capacitor plates, are expected to collapse into each other during...
View ArticleSimulation in Finned Tubes
How to do heat transfer and flow simulation in Finned Tubes I tried a lot ; but i could not able to give correct boundary conditions. Please help me to solve this problem.
View ArticleDifference between optimization and parametric sweep?!
Hi Comsolers, Could you kindly tell me that what is the difference between optimization module and parametric sweep in comsol, please? I know that maybe it is simple question, But I want to need when a...
View ArticleSmoothing battery current changes
I've been having issues with the capacity fade model and I think I may have narrowed down the problem. See the model in question here: www.comsol.com/model/capacity-fade-of-a-li-ion-battery-12667 I am...
View Articleresistance measurement
Hi, I am working on joule heating and thermal expansion module. I want to measure resistance between two terminals. No voltage is applied to the terminals, no current flow initially. Later through...
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