frequency domain study with external circuit
Hi The comsol model gallery includes a frequency domain model of a capacitor. I added an external circuit coupled to the capacitor and a time dependent study runs OK (as shown in a separate gallery...
View ArticleOrientation of legends when exporting as .eps
Hello, For some mysterious reason, the legends are turned "upside down" when I try to export a 1D plot as .eps as compared to when I save the exact same picture in any bitmap format. By upside down I...
View ArticleHow to create a spiral inductor in COMSOL
Hi, I am a new learner of COMSOL. I would like to learn how to create 5 uH spiral inductor. I have researched on website but I could not find the tutorial step by step. I saw only in AC/DC Library with...
View ArticleLicense error: -38
Hello, Whenever I try to run COMSOL 4.3, I get this error : License error: -38 User/host on EXCLUDE list for product User/host on EXCLUDE list for feature Feature: CADIMPORT license path: C;\Program...
View ArticleMeshing Air
I'm new to 3D COMSOL and I have the geometry for a chamber that will have air running through it while it performs its function. I am easily able to mesh the geometry, but I'm having problems finding a...
View ArticleHow do you model hoop strain?
I have a 2d model with a pressure inside an oval. I was wondering how to figure out the total hoop strain or tangential strain of the outter diameter
View ArticleCOMSOL with Matlab syntaxis (plotting and extraction datas while optimization...
hello. I'm trying to make belows these days. First, I've opened a 'Topology Optimization of a Loaded Knee Structure' from the model library that is aleady exist. And I clicked 'reset history' then...
View ArticleUsing Google Sketchup for designing geometry
Has anyone found a way to export geometry from Sketchup to COMSOL? I cannot seem to find a format that works in practice. Are there any special considerations to make when converting/exporting the...
View ArticleTrouble coupling heat transfer physics for both fluids and solids
Hey all, So I'm getting stuck with my model where I try to couple three different physics. The three physics are: Electric Currents, Heat transfer in Solids, and Heat transfer in Fluids. Basically what...
View Articleelasticity matrix elements order
Dear All, I am trying to specify a new piezoelectric material. I have the all the required parameters, but I am uncertain about the order of the matrix elements. All matrices (e.g. elasticity matrix)...
View ArticleTransient simulation output doesn't match input
Hi I'm simulating a 2mm radius magnetic loop excited by a transient current and surrounded by a 10cm air sphere, in time dependent study. I've interpolated a gaussian current input from several points...
View ArticleLaminated core
Hello everyone, I’m interested in simulating the induction heating of an object that occurs with the help of a rectangular coil that is placed above it. The problem that I’m facing is that I want to...
View Articleelectric currents model
Hallo, i have a question about the electric currents model. My simulation is 2D axisymmetric in frequency domain. The geometry is a solenoid which has two turns. As you know, if the current flows...
View ArticleJoule Heating- 3D Rectangular Bar
I have 3D model of a rectangular Copper bar with 3 rods attached to it. These 3 rods provide electric energy to heat the rod. I am not sure what is incorrect with the case set-up, asI have run a very...
View Articleparticle tracing module: size distribution function
Hello, I would like to simulate the trajectoires of polydisperse particles in a gas using the "Particle Tracing Module". In order to simulate particles of different sizes, I created an "Interpolation...
View ArticleComplex unit i in Comsol
Hi I'd like to simulate a variable containing the complex unit i. I'd like to calculate the voltage V = i*2*pi*f*S*B with i the complex unit.I read the docs and found that i and j are supported as...
View Articleboundary condition that depends on the position
good afternoon I need to enter a boundary condition in Heat Transfer that depends on the position, what should I do? thanks
View ArticleRecovering desired eigenfrequencies
Hi, I'm performing an eigenfrequency analysis of a model in the Comsol 4.3a RF module. My problem is that, though I ask for only 1 eigenfrequency, Comsol ALWAYS gives me 2 eigenfrequencies: one purely...
View ArticleHow does COMSOL create its mesh on imported CAD geometries?
Dear community, I am trying to import geometrical models of the human body to build a virtual man in COMSOL based on the free BodyParts3D database. The database supplies every piece of a human body as...
View ArticleError while solving Joule heating: mesh-case 0 there are 665 void equations...
Hi, I tried to simulate joule heating in a copper cylindrical wire with an cylindrical air-void in it. But I am getting following error: Failed to find a solution. Singular matrix. For mesh-case 0...
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