Help with moving in Comsol.
Hello Mr. Ivar. I am writing to you because you helped me to solve most of my problems. Therefore, I would like to learn if you have any experience with choice Physic Manager Builder. And one more...
View ArticleLicensed number of users already reached.
Dear sir, I am from IIT Madras and I am using an institute license. While opening the heat transfer module in COMSOL, it is saying "Licensed number of users already reached.". Can I know what the...
View ArticleCFD - Surface roughness
Hey guys I really need your help on this one! I was wondering if any of you could tell me about the default settings of surface roughness's in COMSOL? All I've found about it in the documentation is...
View ArticleEffect 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 ArticleTwo interdependent studies - but I cannot use results from frequency domain...
Dear all, How can I use the result from a parametric (parameter 'b') sweep-frequency domain study (e.g. emw.Ez(b) ) in another function defined under Definitions (e.g. f(emw.Ez(b)) ) which is used as...
View ArticleFrequency domain with two input variables
Dear all If I add a external force on one end of a silicon beam while let the other end fixed, is it possible to put a constant voltage across this beam in frequency domain simulation? It seems...
View Articlegive specific values for every mesh point of a boundary as boundary condition
hey everybody, is it possibly to give different values for all points of the mesh on the boundary, respectively? for example, just a vector containing as many values as i have boundary mesh points, or...
View Articleinitial value set-up
Hi, I have a 2D simulation running from T=0 to T=100. First, I run the simulation from T=0 to T= 50. Then I want to use the solution at T=50 plus some value changes in specific domain as the initial...
View Articleself-intersection
Dear all, I'm trying to mesh a more or less complex structure and right now, I always receive the error message that self-intersection is not supported. Can anyone explain this error message nearer to...
View ArticleFinding a mapping of Current Density (variable J) using the Electrostatics...
Hi everyone, I'm making a model using the Electrostatics Interface from within the limited AC/DC Module included with the base COMSOL Multiphysics package. Initially, I tried making my model using the...
View ArticleMagnetic field
Hello I created a simple model where the magnetic field and electric wire. 1 Why not spread outside the magnetic induction coil? 2 Why is not moving conductor in a magnetic field? What I made a...
View Articlecomputing accurate fluxes with periodic boundary conditions?
Hi everybody, does anyone know if I can compute the fluxes accurately, as described in the user guide on page 308 ff. and file 0973 from the knowdledge database etc, when using periodic boundary...
View ArticleElectrostatics vs Electric Currents Interfaces. Something is wrong...
Hi everyone, I mentioned this in an earlier post. I believe I have an inconsistency with the software (COMSOL Multiphysics Base Package). This may or may not be intended. When picking between the...
View ArticleInvalid Property Value "Lengthunit is a string" Error Message using Livelink...
I have this strange error message when I click on my geometry stating Invalid Property Value - Property: Lengthunit 'length unit' is a string which I cannot get rid of. I think I do not have any length...
View Articlerenew COMSOL license using a passcode
I downloaded the COMSOL 4.3a compact DVD image, double clicked it, then a "COMSOL 4.3a INSTALLER" interface showed. When I clicked the "Change license" button, a window pop out that says "specify an...
View ArticleNon - Isotherma pipe flow
I am not able to find the "Non - Isothermal Pipe flow" module in my COMSOL 4.3a version. Can you help me out how to find it?? If not, I request you to help me with any method for simulating a pipe flow...
View ArticleHow do I make a laser on z-axis in 2D modeling?
Hi, I did 2D modeling in Electromagnetic waves, Transient mode. I wanna make a model in which the enhanced electric field is shown when a laser passes from air to nanopattern. however i don't know how...
View ArticleAssigning Materials
While assigning materials to some solids in my model, I am getting a red cross below the material name in Model Builder. What does that mean? What changes should I do to use those materials for the...
View ArticlePDE General Module for Stefan-Maxwell diffusion
Dear User's I am trying to perform a run at PDE general module and having some issues when i input the Flux vectors. Can anyone tell me how the form of such vectors should be?? Thank you very much
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