How to applicate a Magnetic field
Hello I'm beginner wuth Comsol and i wish to applicate a magnetic field into the metal structure of a surface acoustic wave sensor. Thank you for your help
View ArticleError to initialize a physics interface created with Physics Builder in...
Hi all, I am trying to compile with LiveLink for Matlab (Matlab version MATLAB_R2012a) a Comsol model (Comsol version COMSOL 4.3.0.151) that uses a physics interface which I created with the Physics...
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 ArticleHow to realize moving boundary integration in COMSOL?
This is a math problem in calculating the photo-ionization of streamer discharge by comsol. The 1-d calculation domain is (0,d), and one point inside this domain is x. We need do the calculation in two...
View ArticleSpatially-varying boundary condition (electric potential)
Hi all! I am using the Electrostatics package and need to define a surface with a linearly-varying electric potential that depends on one dimension of the model (e.g. V(x,y) = Kx). I tried to define a...
View Articleheat generation calculation
Hi, I am modelling microwave heating by Comsol 4.2 I used heat source domain and electromagnetic power loss density as heat source but I couldn't calculate heat generation terms (W/m^3) When I use...
View ArticleRectangular Pulse Train Creation
Hello, I am attempting to create a pulse train for my model. I am new to introducing pulses and would like an equation to place on my electrcial potential module to create the following: Rectangular...
View ArticleSurface tension as a variable
Hello all, I have a general question about surface tension in COMSOL. Can surface tension be assigned as a dependent variable? More importantly, can it vary in time AND space? Or be assigned as a...
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 ArticleAxial flux permanent magnet generator
Hi Dr. Ivar/All, Iam trying to simulate the axial flux permanent magnet generator with two rotor and a coreless stator sandwiched between two rotor. Permanent Magnets are attached on inner surface of...
View ArticleMultiple input ports in RF problems
Hello, I'am doing a simulation with RF module. It's about the mode analysis of a rectangular silicon waveguide. There are two waveguides. To propagate the monochromatic light of 1550nm (1.935e14 Hz ),...
View ArticleCement flowing around funky 3D shape and displacing mud
Hi, I have an interesting fluids problem. 3D object in a snug fit inside a water filled tube. Pump heavy cement in one end, will it displace all of the water as it flows around the object or leave some...
View Articleprescribed dispacement
Hello, I'm trying to do a simple thing with structural mechanics module, but I don't get convergence. I attached the model. I'd like to apply a prescribed displacement at boundary 2 and check the...
View ArticlePeak Temperature Optimization in Laser Heating
In a laser surface heating model the peak temperature achieved on the surface of the material is dependent on the material properties and on the laser parameters. For a given material (Cp, , k) beam...
View Articlefrequency 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
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