Error in sweep. Incompatible numerical evaluation for table.
Hi, I get the error "Error in sweep. Incompatible numerical evaluation for table." when I try to run an optimization study. The stationary study works ok and gives results. It started happening only...
View ArticleHow to do Cluster Computing?
Hello Guys, thanks to Ivar I recently managed to get COMSOL working in Client-Server mode and it does well, but while doing thermal calculations including laminar flow I'd like to let my own computer...
View ArticleBandstrucutre for Air holes in Si dielectric - Help requried
Hi Folks, I am trying to calculate the bandstructure for AIR holes in Si dielectric. I first created a model based on the example (www.comsol.com/model/download/...s.bandgap_photonic_crystal.pdf) in...
View ArticleFloating Potential
I have a question about floating potential condition. I have 2 metals (like electrodes) which are not directly connected to voltage source and i want to use them to measure the signal (or voltage...
View ArticlePoisson-continuity coupled equation
Hello, I try to model the corona discharge in wire-cylinder geometry governed by the equations: nabla (V) =- rho/epsilon0 (Poisson equation) and grad (rho) * grad (V) = rho ^ 2/epsilon0 (equation of...
View ArticleError: You must specify the source.
I do not understand this error. I have only one kind of physics selected, conjugate heat transfer. I have two separated domains, each with a solid piece between them. The domains are bounded by...
View ArticleGet Phase Change Interface Position During Simulation
Dear all, I am currently a bit stuck with a phase change simulation where I want to evaluate an expression and use the result for material properties. To be more precise, I am simulating a 2D phase...
View Articlebulk concentration
Hi I am working with a 2D axisymmetric geometry of the arterial wall. I am solving transport of diluted species (time dependent). I would like to compute and represent the partitioning coefficient (k),...
View Articlemaxm no. of newton's iterations reached & parametric solver
Question about newton's iterations: I keep getting the following error Failed to find a solution. Maximum number of Newton iterations reached. Returned solution has not converged. I am unable to locate...
View Articleeigenmodes of an acoustic shoebox using BEM in COMSOL
Hi all, Has anyone ever coded a BEM formulation for the eigen frequencies and eigen modes of a shoe box ? I'm trying, but it doesn't seem to be that easy... Basically, I want to solve _only on the...
View ArticleHow to use Two Different Times steps in Solver Parameters?
Dear Sir, I am using COMSOL 3.5a. And I am running my simulation for 6hrs. But I want to run my simulation in two different time parts. (i.e. for 1hr i used solver parameters for time stepping range is...
View ArticleMesh : resolving a part much thinner than the rest of the volumes
Hi, I don't know much about the different options for meshes and their mechanism of creation. I am studying a geometry where the is a layer much thinner than the rest of the geometry. 1cm becomes 1...
View ArticleSelective electric field Convergence at Chi3 contribution
Hi, I am looking for convergence of electric field distribution in a 3D tri-layer metal-dielectric system with the metal and dielectric material's electric susceptibility (chi3) contributions at...
View Articlethe free vibration of the cantilever
Hi everyone: The initial displacement D=1.05mm, is placed on the end of the cantilever beam, to solve the velocity response of the beam end. First, I select space dimension 2D, and add physics Beam,...
View ArticleIs it possible to model MAGNETOSTRICTIVE materials in comsol, just like for...
Dear colleagues, In comsol, there are predefined models for the piezoelectric materials. For magnetostrictive materials, they have similar properties as the piezoelectric counterparts. However, a...
View Articlehow to Convert semilog graph to a normal graph ?
Hi all , I am simulating BAW Resonator. I have made my model, based on the PDF instructions that comes along with the model. But, I am getting a Semilog curve for the Quality factor ( Please find...
View ArticleModelling magnetic field excited by AC current
Hi all, I am now simulating the magnetic field excited by AC current. I want to observe the skin effect (a plot of current density against depth) and the time variance magnetic field (a plot of...
View ArticleERROR: nonlinear solver did not converge, when simulating ball movement in...
Hi all, I have seen several threads about this error and tried to figure it out myself using the sample cases but I still fail to simulate this. Any help will be greatly appreciated. I am trying to...
View Article1D Schrodinger equation
Dear Comsol users, I want to solve radial Schrodinger equation for Hydrogen atom in comsol. So I use 1D axisymmetric coefficient form PDE and solve for eigenvalues with boundary conditions as u =0for...
View ArticlePiezoresistive Beam
Does anyone here uses Piezoresitive module for modeling a piezoresistive beam? Or has any example which s/he can send for me? I am really confused about the results and I need to take a look at one...
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