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 Articlejava.lang.ClassCastException when using LiveLink from MATLAB
Hi there, I've been successfully using COMSOL and LiveLink for a few months now for generating and simulating electromagnetic models. However, yesterday I ran the same MATLAB code as I always do, but...
View ArticleDiscontinuity issue
Hi there, I'm trying to simulate Palmer-Mansoori coal permeability model for combination of different Young's modulus and pore pressure. The problem is when I plot Permeability Ratio vs. Pressure, for...
View ArticleFluid-Piezoelectric coupling problem (microchannel of an inkjet printhead)
I was tasked with creating a model of 1 microchannel of a piezoelectric printhead. I've modelled it but the solution doesn't converge (max no. of iterations reached). The physics I've used are...
View ArticleThermal expansion with shells
Hello, I am trying to model the stress-induced curvature of a thin plate with an even thinner coating, each with different CTE, when heated or cooled. The plate is only ~100um thick, and the coating is...
View ArticleAutomated remeshing fails
I'm runing a axi-symmetric model and solving laminar flow with moving mesh. In the process, a few inverted mesh elements are created. To avoid this problem, I tried to use autometed remeshimg when the...
View ArticleError in modeling time dependent objects.
Hi all, I want to simulate the magnetic field which is around a wire with current, and surrounded by air. The problem is in 3D space and time dependent. I have used 'magnetic field' and 'external...
View ArticleM fill insert
I'm getting this error, and don't know what it means, nor have I found anyone citing a similar problem. Internal error in adaptive solver. - Detail: vector:: M fill insert thanks for your help.
View ArticleDeformation of liquid droplet
I am new to COMSOL, so I am referencing a work on deformation of liquid droplet impacting a solid surface. I tried to recreate the same model as that work. But I ran into several problems. As I tracked...
View Articleunit problem in study configuration
I'm a new user, and try to use the Eigenfrequency study on some simple micrometer-scale optical geometry. The Eigenfrequency study settings asks me for a "search for eigenfrequencies around: ____", but...
View ArticleCOMSOL handling of variables in different scales
A general question: We're using COMSOL to solve a system of PDE's and comparing them to our in-house code. The variables in said PDE's are inherently in different scales (i.e. three variables are O(1)...
View Articlegathering time solution in one matrix
I am a beginner in using COMSOL and I would like to know how could I gather the solutions time, as an example a plate heated, it all in just one file to export to matlab. I did some many attempts;...
View ArticleUpdate Interpolation function in each simulation step
Hello Everyone, I am trying to set up a time-dependent simulation in COMSOL v4.3a. It's a structural mechanics model and the material properties are defined by an interpolation function which is read...
View ArticlePower Cycling Life Prediction of 96.5Sn3Ag0.5Cu solder
Hi to all, I'm trying to set up a FEM method in order to evaluate the number of cycles to failure for thermal fatigue in a power electronic device, composed by IGBTs and diodes. The steps that I...
View Articlehi~
have you solved the problem of imposing a maximum constraint on the dependent variable? i am facing the same issue now.
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