How to understand the "provide a degree of freedom" in tutorial "magnetic...
In "magnetic damping" model, the mf physics is not disabled in the frequency domain solving, but with a "provide degree of freedom" button. What is the detailed meaning of so called “provide degree of...
View ArticleHow to mesh very thin films/ layers in MEMS switches? How to make use of...
I want to run electromechanical simulations on MEMS double clamped structure. The problem I am facing is on meshing the thin features in the structure. The top electrode and bottom electrode are each...
View ArticleImage field of a charge on top of a conducting plane
Hi, I was interested in finding image force on a charged particle near a conducting rod in comsol. Therefore as an initial check i simulated a charge near a conducting plate and compared the resulting...
View ArticleCoupling Electrostatic, Structural and Acoustics
I am currently trying to couple 3 different physics for my electrostatic transducer. The coupling works in the following mode: Bias or static mode and time harmonic / frequency response mode. For bias...
View Articleelectrostatic force cause displacement in parallel plate capacitor in COMSOL
Hi, I have been designed a parallel-plate capacitor in COMSOL. Where one plate is connect to voltage of 10V and other one is connected to GND. and a air box is around the parallel plate capacitor. As I...
View Articlewhy it is different between Axial 2D and 3D in Non-Newtonian Flow.
Hellow, i have used this for about 2 weeks. but i have some problems. so i need some help. i drawn a model of the cylinder which is same both them. and they are same values, boudary conditions... but...
View ArticleFSI rotating mesh
Hi everyone, I'm trying to simulate a rotating object inclined in a laminar flow with the FSI physics. I managed to rotate an object with a body load, but it causes a lot of remeshing. The rotating...
View Article"Axis to use as symmetry plane normal" settings
Hi I have some inquiries about the stated subject. Under the postbuckling shell tutorial of the verification models of structural mechanics module, it is stated to that different symmetry edges are...
View ArticleQuestion on a thermal lens
I have encountered a problem. I put a silicon glass slab exposed under a Gauss beam. Air cooling is added. For the first step I used RF to see how the light transmitting through the slab, which is...
View ArticleHow to define a mixture of two miscible liquids at the inlet?
Hello, I have a question about how to define a mixture of two miscible liquids (for instance water and ethanol) at the inlet. My 2D geometry is as follows: I have two parallel rectangles (representing...
View ArticleDirection on boundaries
When im importing a model into comsol as a .dxf file, it seems impossible to change the "direction" on the boundaries, is it? It causes me some trouble when im using the up/down function, when the...
View ArticleTwo electrodes, four layers
Hi everyone! I am trying to do simple model using 3D Comsol Multiphysics // AC/DC module // Quasi Statics, electric // time harmonic analysis ... two electrodes, 0.5V and -0.5V, four skin layers with...
View Articleheat transfer in porous media and conjugate heat transfer
Hello everyone, I'm new to Comsol and I'm trying to couple the heat transfer in porous media with the conjugate heat transfer (solid + water in laminar flow). But i have a lots of problems. I would...
View Articlehow to use the "Single turn Coil" in 3D?
hi everyone! i want to use the component "Single turn Coil" to build Model for a flat inductor. At first i want to realize how this component work, so i have found a example from model Gallery. (the...
View ArticleGlass break as result of pressure - fire sprinkler tube
Hello everyone, I am trying to simulate a fire sprinkler tube of glass with glycerol inside it. As result of increased temperature the glycerol should expand and the glass will break. In the tube there...
View Articlewhy choose air?
I have check several examples in Capacitive Devices folders like capacitor_fringing_fields or capacitor_dc. I found that the examples choose air instead of metal. Why the materials is air for the metal...
View ArticleTitle for Legend
Hi Does anybody know how I can define a title for the legend? Usually there is no name or description on top of the legends, how I can fix that? Bahar
View ArticleSurface vector
Hi, I want to do surface integration in my 3D model. There are rectangular and round holes in the geometry. My integral formula includes surface vector. So how should I define surface vectors in my...
View ArticleSemiconductor Module: Single Electron Transistors
Hey there guys, I have been doing some tutorials on the semiconductor module on comsol. I have done the MOS transistor tutorials. I wanted to know how and to what extent I can apply comsol's functions...
View ArticleBH curves
Hi As I introduce BHcurves in um model AC/DC? i call the archive txt, but the simulation not acept. Thanks
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