electrostatic force cause displacement in parallel plate capacitor in COMSOL
Hi, I have been designed a parallel-plate capacitor in COMSOL. Where one plate is connect to voltage of 10V and other one is connected to GND. and a air box is around the parallel plate capacitor. As I...
View ArticleUndefined value found in the stiffness matrix, requested mesh quality cannot...
Dear All, I am simulating a sphere flowing in a microchannel with solid traps (2D for simplification). Automatic re-meshing is activated. Two scenarios are considered: Scenario 1, the sphere will...
View Articlejava exception error in using postcrossplot code.....
Hi I am working in windows xp os and with Comsol 3.5a with matlab R2008b I am exporting model file form comsol to matlab as fem and is saved in fem file in workspace. when iam using postcrossplot in...
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 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 ArticleDifference between two modules in comsol
What is the difference between module " Structural mechanics--->Poroelasticity(poro)" and module "Fluid flow---->Porous Media and Surface Flow"? Anybody knows? I was gonna implement solid liquid...
View ArticlePhase calculation related error due to incorrect boundary conditions?
I am trying to simulate a metal insulator metal fishnet structure which in infinite in the yz plane and the TE polarized wave propagates in the z direction. I have applied PEC on the planes (xy planes)...
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...
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