3D MOSFET model
I am trying to simulate 3d mosfet model. I have applied all boundary and initial conditions to the 3D model. I have used a swept mesh for domain 2. But in the solver i am getting an error Undefined...
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 ArticleThermocapillary recirculation
Hello, I am a beginning user of COMSOL. Currently, I am trying to create a preliminary model of Marangoni convection, like this one available on the COMSOL site:...
View Articletime steps in time dependent study
hi! im simulating fluid flow in a pipe with transport of diluted species. when i run a time dependent study i noticed that comsol does not keep the time steps constant and skips over large periods of...
View ArticleStep by Step debugging
I am try to solve around 300 non linear partial differential equations which should take around 320 seconds but the simulations breaks after 20 seconds. I really can't find the error in my equations. I...
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 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 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 ArticlePiezoelectric inkjet printhead (unknown physics and boundary conditions)
Hello everyone! I'm a newbie to COMSOL. Unfortunately, I'm experiencing some difficulty in trying to model a relatively simple problem in COMSOL, and I'd be really really thankful if anyone could help...
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 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...
View ArticleModeling closed circuits with pipe flow module (linking inlet and outlet)
Hi Comsol experts, I an trying to model a closed pipe circuit consisting of a network of pipes, bends, valves, junctions and heat transfer areas. A pump is inserted to create the force (dP) to move the...
View ArticleProblem with max field calculation
Hi. I have a resonator inside background media. I use PML around. I am looking at a particular mode. Then I can find the maximum of normE field which is inside the resonator. Now if I change the size...
View ArticleFluid Piezoelectric coupling problem
Hello everyone! I'm a newbie to COMSOL. Unfortunately, I'm experiencing some difficulty in trying to model a relatively simple problem in COMSOL, and I'd be really really thankful if anyone could help...
View Article