License 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 ArticleCOMSOL 4, TE and TM modes
In previous version of COMSOL (e.g. COMSOL 3.5) it is quite simple to choose TE or TM modes analysis. In the COMSOL 3.5, in the model navigator I can choose "In-Plane waves" or "Perpendicular waves"...
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 ArticleSome problem about Numeric of Port in RF module
I learned with the "waveguide_adapter" in model liberary, so the problem below is based on it. FIrst, I don't know the meaning of "search for modes around" in setting of "Boundary Mode Analysis". In...
View ArticleExporting plot data in Comsol 4.2
I've having issues with the being able to properly export plot data with sufficient resolution. In 3.5, I was able to create a and specify the range and number of data points within that line for...
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 ArticleMultiple MEMS devices in parallel using electrical circuit physics ?
Hello, Here is my model: I am simulating a micro piezoelectric systems. The simulation is complex and can take some time. Then, I use the electrical circuit physics to simulate my systems with an...
View Articlehow to simulate the return loss (S11) of Quartz Crystal Mcrobalance
I am trying to use comsol for simulating the reflection loss (S11) of QCM. My question is since the QCM is one port acoustic wave sensor, how to determine the input and output?
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 ArticleSelecting particular effective index for plotting
Hi everybody, In Mode analysis if number of modes=6, then I am getting 6 effective indices for 6 frequencies.I want to plot 2 effective indices out of 6 with corresponding frequencies in 1D plot...
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 ArticlePost-process two different solutions from a Parametric Sweep...
Hello, I am using COMSOL 4.1 and I am facing a conceptually simple problem with no luck. Basically I have a simple 2D Eigenvalue Problem which gives me 20 eigenvalues (and 20 eigenmodes) and a...
View Articletumor ablation model
hello, i am trying to make a model like" tumor ablation" model in comsol Heat Transfer Module but i want to change the current from DC to AC current and i want to plot the electric field distribution,...
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 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
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