time and position dependent reaction
Hello everyone, i am very new to this and not sure which moduls of the comsol software are needed to solve my problem. there will be a phase change with heat production(white box-> black box in the...
View ArticleJavaAPI - 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 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 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 ArticleHow to simulate the water boiling by Level-Set method
There is a good example simulating water boiling by phase field. I am trying to use the Level-Set method. However, I was frustrated by many times of failure. My problem is how to deal with the...
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 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 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 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 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...
View ArticleHow to flip the x-axis?
Hi, Does anybody have any idea about how to flip the x-axis please? Thank you so much for any help
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