New user-defined material
I'd like to add a material to the user-defined materials list. I've looked through the manual and don't see how to do this. Furthermore, there are no materials in the database that seem similar enough...
View ArticleHow to reduce the model file size
Hi, I built a 3D heat transfer, time dependent model. After simulation, the model file goes beyond 5G. Is there anyway I can reduce the file size? I only care how the maximum temperature changes with...
View ArticleMoving laser
I'm a simulation a moving laser though a zinc pill, the problem is that i can't move the surface with the heat flux, the thing is that if i use a Parametric sweep Comsol will compute one point and...
View ArticlePrincipal stress 2d vs 3d
Hi everyone, I have the same model made in 2d and 3d. First and second pricipal stresses are similiar in both models. But third principal stress in 2d are unrealistically high, however in 3d have value...
View ArticleComsol 4.2a Requirements
Dear All, I want to buy new computer with which I want to do simulations around 700 000 - 1000 000 number of degrees of freedom. I of course thought about desktop PC, i7 processor, 24 GB work memory....
View ArticleHelp me: Optimization the pressure!!
Greetings, Thanks for reading my problem. I have some problem about setting the optimization module. My model is simple, In Acoustic Physic, I use an acoustic lens to converge the pressure at the focal...
View ArticleDisplay time-dependent solutions in units of years?
How can I display (in a legend for a plot to be specific) my chosen solutions in different units than seconds? I am dealing with thousands of yeras, and a legend with entries like 9.46728e11 is not...
View ArticleIncomplete instruction for Model Library example (Sliding Wedge)
Hello, I'm trying to create a model from Model Library, using only pdf instruction. The model is Sliding Wedge (Structural Mechanics Module/Contact and Friction/sliding_wedge). The problem is, that a...
View ArticleDifferentials ux and external functions
DEar all, I haven't found any answer in the external function section of the user's guide for what appears to be a really simple question. I need to create an external function which will simply...
View Articleabbreviations for physical parameters
Dear all; I am learning comsol for specific models and found a potential of comsol for the models. But, I am not sure how to input diverse physical parameters such as strain rate in the equation. For...
View ArticleUnits not considered
Hi I define a constant NA with units cm^-3 and a function f(x) = NA*exp(-(x/k)^2), where 'x' and 'k' are in meters making the units of f(x) essentially cm^-3. However, in the variables list, where I...
View ArticleLoad in movement
Hi all, Is there any way to simulate a LOAD MOVING along the boundaries of my object (2D)...so I can see how it deforms as the load passes? Im using the solid mechanics module--> BOUNDARY LOAD??...
View ArticleBending loss in PCF
I want to find out bending loss in PCF using COMSOL 4.2 software. How i will get bending loss from this software. Samiul
View ArticleCurrent Density Plot with EC physics
Hello, I'm very new to comsol and was wondering if one is able to plot the electric current between two plates through a liquid (conductive) solution. I've been looking at the busbar example and see...
View ArticleAbout applying fixed constraint in Structural Mechanics
Dear All, I currently encountered a problem of using fixed constraint. Basically, in my model, fixed constraint is applied on part of a surface. This is how the structure was fixed and held in reality....
View ArticleRegarding inverted mesh elements
Hi all, We were doing simulation on eddy current damping pendulum,.While solving the equations ,we got the error message that inverted mesh elements were found. How to avoid this?? can anyone tell us...
View ArticleMulticomponent multiphase flow
I am currently simulating a model in which the two carrier phases involved are water and toluene and the diffusing components are acetone and methyl isopropyl ketone (MIPK). This problem is to be...
View ArticleMotion due to a magnetic field
Hello everyone, I am pretty new to COMSOL so this might be a simple question to answer. I want to 2D simulate the attraction between a magnet and an iron bead which are located in air (see attachment...
View ArticleAttributes for each region, integration over region
Greetings, I am new to Comsol and tried to see if a similar discussion has been carried out before without luck. I have a magnetostatic model with several regions (windings). I need to connect...
View ArticleModeling aluminum plate heating
Hi. I am lost and need some help. I need to modeling the following case: The heating suffer by an aluminum plate that it is illuminated by a lamp formed by a matrix of 7x7 leds with a total power of 49...
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