CFD - 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 ArticleDiamond Young's Modolus Property confusion
Hi Comsol Community, the Young's modulus property of diamond in the Comsol material library is 105 x 10^9 Pascal whereas the proper property value in literature is an order of magnitude larger: 1220 x...
View ArticleModeling a balloon to plug an opening
I would like to model a balloon used to plug the opening of an oddly shaped container. Ideally, the balloon would start uninflated, expand due to pressure and fill in the hole it is plugging. My...
View ArticleHelp 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 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 Articlesloshing tank problem with FSI
Hi all, I have seen the sloshing tank problem. I want to do same problem with fluid structure interaction that means interaction between fluid and container. fluid exerts a pressure on the wall on the...
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 Article3D Poisson equation problem coupled with Nernst-Planck equation
I used coupled Electrostatics physics and Transport of Diluted Species physics to simulate this problem. The source term in Poisson equation is the difference between cations and anions. Usually, the...
View ArticleSubsonic Ramjet Model
I am attempting to optimize the design of a ramjet to be created for rocket experimentation. I have been working on the model for the fall semester attempting to refine it. I am now using a 2d axis...
View ArticleLow Reynolds Turbulent Flow
Hi folks, does anyone know what the "spf.wall_spf" variable means in the AKN Low Reynolds k-ep model. I can see it in the equation view, but other than that, there is no more info... I am really trying...
View Articlebubbly flow: udrift in laminar flow...
Hi, I am currently working with the bubbly flow application mode in a laminar flow. The gaz velocity, ug, is computed thanks: ug=ug+uslip+udrift In the help, is it said that the drift velocity is...
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