JavaAPI - Display Geometry
Hi everyone, I try to display only the geometry for a loaded problem within a java api. Displaying the results for any problem works fine after implementing the steps from...
View Articlewrong module is required by model?
Hello, I have a simple heat transfer model that used to work. Now, when attempting to load it, COMSOL returns the following error: could not obtain license for CFD module//license error -4// Licensed...
View ArticleMismatch between calculated answer from Comsol and Matlab
Anyone know why the result generated from Comsol (4.2) different from the result calculated by using Matlab? I am doing 2D mode analysis for photonic crystal fibre, i draw and defined all parameters...
View ArticleNew 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 ArticleExtracting absorbed power
Hi all! I am currently doing a 2D model where I have an incoming power, and then I have absorption within the material. As a result, I have the value of the intensity everywhere, but I don't know how...
View ArticleDispersed phase discretization - Mixture Model, Laminar Flow
Hi all, I have a question related to the discretization of the dispersed phase in the Mixture Model, Laminar Flow interface. Under "Discretization" is only possible to choose the discretization for the...
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 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 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 ArticleHow to draw a parabolic shaped solid?
Hi there, I am trying to draw a parabolic shaped solid to present an AFM tip. I can draw a parabolic curve in 2D using the paramatric curve function. Then I can do revolve of the prabolic curve....
View ArticleDiode example solved but strange
Hi I tried to solve the semiconductor diode example from the model library but simplifying it a bit. In particular, I discarded the rounded corner and just made it a text book like pn-junction. It...
View ArticleTotal Mass of a Structure
Hello, I was wondering how to extract the total mass of system. I have solids model of a beam and a beam model of a beam. I wanted to compare their total masses to each other. Any help would be greatly...
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