Modeling 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 ArticleBoundary 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 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 Articlev4.1 RF How to use two or more variables in parametric sweep
Hi I want to do parametric sweep that effects the geometry too. The first variable is the incident field wave length and second is angle of incidence. How to run these parametrics or how to run nested...
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 ArticleEigenvalues from different study steps
Hi everyone, I am trying to calculate an overlap integral between two modes of different origin -- a common problem of electrooptics or optomechanics. So I have two physics interfaces (say...
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 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 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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