How to define a variable depending on another variable at the other position
Dear community, I'm trying to define a variable, y, which is determined by the other variable, x. The problem is that y is determined by the values of x at two different positions in the domain....
View Articlethermal stress on wafer bonding
Hi, I am a student and i am new with COMSOL. Please help me some problem. I want to simulate the thermal stress in the wafer bonding. The material I used : Indium phosphide on the top, Al2O3...
View Articleacoustic
Dear all, I want to apply point source in the form of gaussein pulse (Force[N] vs Time[sec]) I have the peak amplitude in {N} but I found out that I have to put max. ampliude in m^2/s what can I do?...
View ArticleChanging geometry etc. between study steps
Hi, I've got a rather exotic problem at hand. I want to use the Livelink to Matlab of COMSOL 4.3b to simulate an evolving system. I am using the Diluted Species Package. So I start with a configuration...
View Article2D object in a 3D model
Dear All, I am a new COMSOL user and I would really appreciate if you could help me with the following issue: I created a 2-D object in 3D. Then, I added a 3D object in front of the 2-D one. I want to...
View ArticleDefine a circular or elliptical polarized light for standing wave in a Ring...
I want to demonstrate the phenomenon of standing wave in a dielectric ring. It is quite simple that if the circumference of the ring equals an integral number of light wavelengths, there will be a...
View ArticleOscillation in convergence plot
In my time dependent solute transport modeling the convergence plot stock between two points and oscillates there for ever. I guess it may because of the initial values. I was wondering if there is any...
View ArticleStatic Mixer Question - CFD
My question has to do with interpreting pressure drop results for turbulent flow in a pipeline static mixer. Energy dissipation length is a relevant quantity in the design of static mixers, and is...
View ArticlePorts and Floquet Boundary conditions
Hi, I'm trying to build a 2D model showing total internal reflection, but am building it piece by piece to ensure the physics works. So far, I cannot get the ports and boundary conditions working for...
View ArticleAutomatically export integrated data between parametric sweep
Hello, I am using COMSOL 4.2a, on a 64-bit windows 7 machine. I am solving the "Heat Transfer" and several "Diluted Specie" concentrations. I want to run a parametric sweep and export a specie...
View ArticleError in simulation
Dear all , I am doing Coils simulation as attached png file here (coil.png) with separation of two coils and ferrite bars on primary in a distributed passion and I studied about model Single turn and...
View ArticleHow to use COMSOL batch to solve many files repeatedly without GUI?
Hi, When I open an .mph file with a given geometry and settings, then click "Solve", COMSOL creates the mesh then solves the problem. I would like to do this in batch mode (i.e., without GUI), however,...
View Articlegeometric nonlinearity
When should I check the option of "geometric nonlinearity" ? I understand it is used for large deformations but what is meant by large deformation? What should the magnitude of a deformation be inorder...
View ArticleDisk error while reading from temporary solution files
Hi, version: Comsol 4.1.0.185 when i was making a plot, the following error warning displayed: " Disk error while reading from temporary solution files". But if i transformed the expression from...
View ArticleTurbulence in pipe flow
Hi, I am studying the Navier Stokes equation in the context of pipe flow. As of now, I am using Water, modeling it as incompressible, with outlet at 0 Pa and a parabolic inlet profile. (currently at...
View ArticleThermoelectric Effect - Adding the physics
Hello, I'm working in a project on thermoelectric generator. As 'Thermoelectric' physics interface,is not in the physics area/physics list, I was trying to add the physics using the steps given in the...
View ArticleHiding geometry/domains
Hello, i'm pretty new to comsol. I modeled an IR-Thermopile sensor with the heat transfer with surface-to-surface radiation. In order to realize some convection, the sensor is clouded by air. Question:...
View Articleabout current density in coil
excuse me i have a problem about the current density in coil . I am using the sample "indutiv heating.mph" now, and I changed the current in the coil to 3500A, and changed the coil 's cross surface to...
View ArticleHow to make a vacuum chamber in a capacitor?
Hi, I am trying to model a MEMS capacitor built on the silicon substrate. The thin top plate(membrane) of the capacitor is also made of silicon. The gap between the plates is vacuum sealed. So with...
View ArticleCoil Current not matching Integrated Current
So I'm doing a 2d axial model. I'm using a multi-turn coil and I am plotting the current in the coil. I've defined my voltage as a step function and that is the excitation. Just noticed that when I...
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