'ec'-'ht' Multiphysics error and impractical outcome of Temperature...
Hello all members, There are 2 physical problems that I'm required to solve simultaneously; 1] the distribution of electrical current (due to an application of high-voltage) 2] the distribution of...
View ArticleMicrowave heating of a Split Ring Resonator.
Hello good people! I have modeled microstrip line coupled with a split ring resonator(SRR) and have included in the attachment. Resonance of the SRR is achieved at 2.06GHz. Now I want to simulate one...
View ArticleGaAs Solar Cell; Semiconductor Module + RF Module
Hi there ! So this is my problem ... I get this Error Message (Error message is "Maximum number of Newton iterations reached."); "Doesn't Find Solution... I'm new with this software and i just throw...
View ArticleRe-using physics interface as a study step
Hi, In my study I use EMW interface to calculate a set of parameters (let's say, polarization-'p') and then implement these results in the next step, which uses a different EMW interface....
View ArticleHow to couple physics
Hi, I've seen several tutorials in which the demonstrator is able to take the solution from one solver and use it as a constraint for the next solver. In every case, the demonstrator already knows the...
View Articletransport of diluted species and laminar flow
Hi all! I want to simulate a cylinder moving in the water, and it can generate some species on the bottom of the cylinder. So the move of the cylinder will influence the transportation of the diluted...
View ArticleRecoverable error in residual, but solver could not recover.
Recoverable error in residual, but solver could not recover. What is the meaning of this error ?
View ArticleFluid flow in variable zeta potential
Hello, I'm trying to simulate the velocity profile of fluid in a long and narrow column. For wall boundary condition I'm using "Electroosmotic velocity". I want to have variable zeta potential on the...
View ArticleEigenvalues from different study steps
Hi everyone, I am trying to calculate an overlap integral between two modes of different origin -- a common problem of electrooptics or optomechanics. So I have two physics interfaces (say...
View ArticleUsing lower limit node
Hi, I'm trying to use the lower limit node, but I can't select any variables because the variables window is not there. I can select variables in the segregated step nodes. See attached file for...
View ArticleStiffness error
Hi Ivar, I am having a problem (written below) to solve my model. could you please suggest me what I should do? So far, I have defined all parameters but still having the same prob. My model is...
View Articlecoupling of two physics
Hi guys My simulation has two physics in it. The second physics is piezoelectric and I am trying to apply the line integral of the dependent variable from the first physics as the input to the Voltage...
View ArticleCannot model losses in RF module
Hi I've been trying to model a lossy dielectric in the RF module, using the transient electromagnetic waves interface. However, if I set the model to be based on the refractive index, COMSOL appears to...
View ArticleParameteric vs. Batch vs. Cluster sweeps
Hi, I have a time-dependent model and I would like to sweep through a range of values of one of the model parameters. The problem is an 'embarrisingly parrallel problem' and very much similar to the...
View ArticlePermanent magnet model produces no field + relative error to high
Hello all, I am a relatively new COMSOL user attempting to model an electric motor design (of the out runner type) with the Rotating Magnetic Machinery physics. Currently I am working on the permanent...
View ArticleDuplicating variables with component couplings
Hello All, I am using a "control variable field" in the optimization module to define some variable 'p' on a boundary. I have an identical boundary offset by a few cm, but I would like that variable...
View ArticleTwo simultaneous COMSOL instances on one machine can save time
Dear community, today I tested something I had in mind for quite some time. On my workhorse computer, a 3.6 GHz Core i7 with 4 cores I always observe that a COMSOL calculation brings up CPU use to a...
View Articleconstraining dependent variable
Good day: I am trying to find the most effective method of implementing a constraint on a dependent variable. I am solving a classical diffusion equation (using Equation based modeling)of concentration...
View ArticleInitial conditions (steady state) to time dependent model
Hello All, I have a model where I want to find the steady-state solution to a time dependent model, I let it run with a large time block. Now I want to use this as the initial condition to the next...
View ArticleJava Runtime Environment error
Getting following error, A fatal error has been detected by the Java Runtime Environment: # # SIGSEGV (0xb) at pc=0x0000003da3efbc6c, pid=6909, tid=46912497239488 # # JRE version: 6.0_20-b02 # Java VM:...
View Article
