Effect of sound pressure on refractive index/density
Hello fellow Comsol users, Most of my experience comes from structural mechanics and fracture and would like to ask a little help regarding pressure acoustics. The presence of high and low pressure in...
View ArticleAbout creation of struturegeomerty
Hi...! I am a student of University of Pune,working on Rf MEMS Switch. I can't get how to create a structural geometry of cantilever beam in Com sol multiphysics. So please help me to create a...
View ArticleAC Electrical Field simulation in interdigit structure
hi I want to do AC filed simulation for interdigit structure. I am wondering what kind of physics should I select and how I can apply AC signal to my structure? I would appreciate any help
View ArticleTemperature change from expansion of air
I am trying to model the flow fields of a fluid (air) traveling through an orifice. I have a working model that works great using only the laminar flow module. However, the viscosity of the fluid is...
View ArticleCoupling B/W two solid stress-strain modules
Hi all, I am trying to model a 3D structural mechanics problem with two separate solid stress-strain modules coupled together at the interfacial boundary through equal displacement boundary condition...
View ArticleGenerating continuous electrons from cathode
Hi, I'm trying to simulate an 13MHz electron gun with an oscillating grid voltage. I have created the necessary 13MHz fields. But I couldn't create the electrons continuously with using "Release from...
View ArticleSurface Plot results not correcly moving
Hello, i have a "moving mesh" problem coupled with magnetic fields. I want to let the domain of a magnet move by a prescribed deformation in the ALE-Interface. It's a sinusoidal movement of a...
View ArticleExtrap
Hello Comsol gurus, I am doing a CFD simulation in which I need to use the solution of another CFD simulation. I need to take a "slice" of the solution and use it in another geometry. As I understand,...
View ArticleAnimation depending on distance
Hello dear Comsol gurus, I have made a CFD simulation (stationary) which is based on the model library example of the static mixer. I have also generated the slices and surfaces to see how my fluids...
View ArticleStrange results when combining Induction Heating and Laminar Flow
I'm working on an inductor model in induction heating with cooling via laminar flow. I have tried exciting the inductor in two ways: via Lumped ports and Surface currents. The cooling is...
View Article.mphdev for existing physics modules
Hello, I am new to COMSOL and I am trying to build custom physics model for thermoelectric effect implementation. I am wondering whether it is possible to view the physics builder files for existing...
View ArticleSimulation of an hydraulic accumulator for pulsation reducing
Hello COMSOL community, I am trying to do a transient simulation of an accumulator in a hydraulic circuit. For simplification, the accumulator shall be placed as a bubble of a second fluid domain...
View ArticleUnusual condition between two fluids
Hello, i`m new here, then sorry if this is a silly question... I need to set the follow condition in the interface between two fluids: ro_v*u_v*hfg = ro_l*u_l*hfg = lambda_v*(dTv/dx) -...
View ArticleGeometric Nonlinearity problem
I have an odd problem. I am trying to recreate the Large Deformation Beam model (www.comsol.com/showroom/documentation/model/204/) before I start my own project to investigate buckling. I was following...
View Articlematerials of a surface mesh element
Hi everyone , I’m looking for a possibility to distinguish the different materials that belong to a single surface-mash-element (for example: a triangle) in matlab? For better understanding - my...
View ArticleColors messed up when exporting GIF
Hello, When I export a GIF from COMSOL, often times the color scheme will be all messed up. Instead of a fluid change from blue to red, I will see about 16 distinct colors. This looks terrible and is...
View ArticleNon-isothermal flow problem
Hi there, I am trying to create a model that is similar to the cold water glass model found within the comsol model library. However, I want to have a temperature governed by a step function at the...
View Article2D electrostatic Force
Hi, I am modeling a slice of a simple comb capacitor in 2D. I would like to determine the force acting on the fingers. I can calculate the electric field, but when I try to determine the force through...
View ArticleModeling a water turbine using actuator disc theory
Hello, I'm trying to model the flow in a (simplified) tidal channel. For now there is one turbine placed in the channels (this might be extended to two or more). With this model I hope to study the...
View ArticleIssues with Full Coupling of Physics
Good day, I am having issues with fully coupling two physics. My system contains the solid mechanics physics coupled with a general form PDE to model concentration change and the diffusive properties...
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