Extremely thin geometries
I created a cylinder with radius 1e-6 m and thickness 9e-10 m in 3D to make a continuum simulation of graphene. I have initial radial stress, an uniform body load along the thickness of the cylinder...
View Articleintegral value of variable till a radius value interior to the circle radius
Hi, I want to get integral of a variable till a point in the circle of radius r0, where this point would vary from 0 to r0. That means I want to get for all radius value till r0. With intop operator...
View ArticlePiezoelectric coupled with a shunt circuit for vibration damping
Hi, everyone! I am simulating the effect of a shunt circuit on the vibration of a piezoelectric device. Theoretically, with a shunt circuit connected (a resistor and a inductor in parallel with the...
View ArticleAbout convergence
Now I meet an unfamiliar issue. For the solver I had set the relative tolerance as 0.001 and used the direct solution. As the simulation processed, this value was lower than 0.001, but the simulation...
View Article980 Boundary conditions
Hi, I have a so called fieldcage with 980 copper strips. Now i have to set to each strip an electrical potential as boundary condition. this potential is not arbitrary but decreasing in steps. is there...
View ArticleInverse heat conduction problem - determination temperature-dependent thermal...
Hello, I am interesting to solve an inverse heat conduction problem in order to determine the thermal conductivity using Comsol. The study area is a block and I have the six boundary values and 50...
View Articleabout the field in the coil
Dear all , I am trying to excite the primary coil with current of 10 A , and need to test the magnetic field induced in the secondary coil , i excited the primary coil with current using single turn...
View ArticleMeshing problems for 3D periodic problems when using GMRES
Hello all, I need help and I hope somebody with experience of using iterative method for large 3D problem would be willing to give me help. I wish to calculate large 3D periodic problems in the RF...
View ArticleElectromagnetic field simulation
Hello! Please help me with electromagnetic field simulation. I appriciate any help! I have two wires, the first one is active, the second one is passive. I need to reserch the influence of the active...
View Articlemislabeling of periodic boundary conditions with changing geometry
Hi Problem: I have a unit cell of a periodic lattice structure. The unit cell has Floquet periodic boundary conditions [PBC], and I am doing a parametric sweep of the geometry features of the basis...
View ArticleCan I disable or delete the boundary zero flux subnode?
I am solving for the magnetic field (g) inside a resonating microwave cavity using mathematical module physics. I use a coefficient form PDE of the Helmholtz equation inside the domain and a boundary...
View ArticleComsol 4.2a, RF MODULE, PML
Dear All, I have question about this module which I uploaded. Medium is air, substrate is glass, and I want to put some dipole on that glass. My question is about PML. As I know, I should put always...
View ArticleHOW TO OPTIMIZE DISPERSION OF AN ACOUSTIC HORN MODEL IN 3D
I was able perform a simulation based model 2d using as reference the file in the list of tutorials (horn shape optimization), but I can not do this on a model imported from solidoworks in 3d. My horn...
View ArticleMesh Data Format
Hi, I have a 3D object that I'm trying to mesh. I exported the mesh data file and tried to understand its contents and ran into some issues. How are the geometric entity indices related to the mesh...
View Articlefield of maximum temperatures over all time steps
Hello everybody, how do I get the field of maximum temperatures over all time steps in a transient heat transfer simulation (Comsol 3.5)? I am simulating a welding process using the heat transfer...
View ArticleMeshing_Error
Hello everyone, First of all I would to great everyone who help this forum working and your incredible support. Well, I am working on heat exchanger simulation here in Comsol and since I got error...
View Articleimporting txt file to create geometry in comsol 4.0a
hi can i create a geometry by importing coordinate data existing in a text file in comsol4.0a? suppose i am having (x,y) data in a text file and i want to use this data for creating geometry in...
View ArticleInterpolation Function Help
Good Morning, I'm having trouble using COMSOL's interpolation function, and I was hoping someone might be able to help. I'm trying to load data from a tab-delimited text file. I've followed the...
View Articleproblem with parameter sweep (Comsol4.2)..
Hi all, I have a wierd problem with paramteric sweep. I have a linear elastic, structural mechanics , stationary problem and I want to vary the young's modulus to see the effects. When I put the more...
View ArticleSurface current density unit
Dear All, I am currently doing a simulation on Comsol 4.2 on a 2D magnetic field representation. My question is regarding the input value of current density within magnetic fields module. I would have...
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