Work on COMSOL through MATLAB
Hi I would like to run COMSOL from MATLAB. I saved the model as M-file and tried to run it in MATLAB. I found the error. MATLAB command line showed ??? Java exception occurred: Exception:...
View Article[SOLVED] "Solution not initialized" when using Livelink for Matlab
(Documenting for others' possible benefit.) This error happened: ============================================================ Error using com.comsol.model.impl.SolverSequenceImpl/getPVals Java...
View ArticleModulo function for making pulse train.
Hi, Trying to make a pulse train by combining the heaviside function with the modulo function, as described in a previous post. The heaviside works fine for one pulse: (flc2hs(5- t),1) But when I...
View Articletime dependent boundary conditions
hello all.. i am solving a time dependent heat transfer problem.. at the start ,for a rectangular domain boundaries 1 and 2 are insulated and 3 and 4 are assigned with constant temperature.. after some...
View ArticleStop condition in Electromechanics(emi)
I would like to implement a stop condition similar to what is described for a moving mesh problem. The parametric study would stop when the mesh quality is lower than a certain value, inorder to...
View ArticleMeshing and convergence problems
Dear Comsolians, I was finally able to draw the problem in 3D in Comsol :), am also a beginner, lol. The way I have modeled the coils is that they do not form a complete closed loop, thus I assigned...
View ArticleCoupling Surface Charge Density from Electrostatics to Electrical Circuit
Hi, I have made a model of a varying overlap capacitor with an electric potential on one side as an electret. It seems to work with just ES and ALE but once I add in CIR and set the top electrodes as...
View Articlecurved beam
Hi, How can I change the radius of curvature of a reinforced concrete straight beam inorder to come up with a curved beam?
View ArticleMultiple concentration step function
Hi, Have a great day. I am a new user of comsol 3.5 version, currently, I am working with chronoamperometry and I am trying to simulate that one using comsol by multiple concentration step functions....
View ArticleElectrostatics using deformed result of solid mechanics
Hi, I am new to COMSOL, using version 4.1 to simulate a flexible capacitor. The goal is to have the geometry deformed using a Solid Mechanics simulation (which I have done) then simulate the behaviour...
View Articlecubic bezier curve
Hello! I have some problems in a project: In the geometry I attached to this message I designed a part of tensile test sample to simulate the stress and strain in the sample. Between the upper, broader...
View ArticlePiezoelectric Device 3D
I'm a quite new user in Comsol, and I have some doubts about the Piezoelectric Devices (pzd) Module. I have built a model with 2 ceramic rings (see the model in the attached file), that are suposed to...
View ArticleSolution isn't converging
Hello everyone, I'm having a problem with my simulation, where it isn't converging. It's a very thin plate (10 nm) of graphene, and the dimensions of it are around 0,5 um. I've made a simulation where...
View ArticleGeometry of a cylinder
Hello! I am a beginner in COMSOL and i would like to ask you about the dimensions of a cylinder in 3D! In my model i have to design two cylinders with the next dimensions: the first one with radius =...
View Articlesimply supported beam
Hi, How do i define the constraints for a simply supported reinforced concrete beam which has both truss and solid mechanics elements. Do I use boundary conditions or edge conditions
View ArticleModeling Capacitor with Electric Currents
Hi, So I am trying to model a parallel plate capacitor with a variable overlap between the plates. Going through the ACDC models in COMSOL, I don't really understand how using electric currents can be...
View ArticleSimple Contact Mechanics Problem
Hi All, I have been struggling a little with trying to implement a contact mechanics. I am modelling indentation of a hybrid polymer base layer in 2D. The polymer base layer is a combination of two...
View ArticleVelocity gradient expression in 2D-axisymmetric
Hello, the velocity gradient tensor for a 2D-axisymmetric problem presents, for the phiphi component, the following expression chns.graduDGphiphi = if(abs(r)<0.0010*h,d(u,r),u/r) does anyone know...
View ArticlePoission's ratio problem related to Structural Mechnics
Dear all, I just started to learn COMSOL and tried to conduct a simple simulation of deformation of an elastic plate by a face load. I used Solid Mechanics model in 4.3 edtion. 1. When I set the...
View ArticleElectric field not adjusting with moving mesh
Hi, I have created a model which is effectively a capacitor with a moving plate. I have ground electrodes on the fixed top plate and +/-100V electrodes on the bottom moving plate. I am using ALE with...
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