the 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 ArticleMaxwell Stress Tensor
Hello all, I'm new to Comsol and Im having a little difficulty getting my head around how the Maxwell Stress Tensor operates. I understand its operation when applied to parallel wires (Like in the...
View ArticleMake my model infinite at one direction
In order to make my block having an infinite length in x-direction (as it is a stripe of graphene and extends along its length to infinity) Should I use some specific Boundary Condition??
View ArticleSettings for simulating static or rf field between metallic contacts
Hi, I'm a new Comsol user and I'm interested to simulate the 2d field between two electrodes on a substrate. The electrodes can work at low but also at high frequencies. I've been able to draw the...
View ArticleFlow in a pipe with a very large aspect ratio
I'm trying to solve what should be a very simple problem as part of a larger project I'm working on. It's just laminar flow in a pipe of length 14,000 feet and radius 0.04 feet. I'm just trying to find...
View ArticleMessage:
What does this message mean: Parametric solver does not support geometry and mesh dependent parameters? It solved me things but not sure if it is correct.
View ArticleAssign number of processors to a Comsol server
Hi, the option -np sets the maximum number of processors that Comsol is allowed to use. When Comsol is started in server mode this option seems to be ignored. For example Comsol server is started...
View ArticleOperate with the solutions of a parametric sweep simulation
Hello I have solved a problem using the parametric sweep simulation. Now, of course, I have a result for echad parameter, now, what I want it is sum all of these results, what I do not how to do it......
View ArticleOptimization of the minimum deviation from measured steady state conversions...
I have correctly assembled the model physics and have a working COMSOL model for the conversion of a certain species. This model does not incorporate any optimization. It is necessary to use...
View ArticleStore the data points into the created table
Hi, I have problem is that what kinds of ''form'' can store into the table. I just want to interpolate the 2-D plot, however, when I want to the store the "2-by-N array" into the table, the problem is...
View ArticleWork 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...
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