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calculate the electric field near a pylon

Hi everyone, I just started using COMSOL and I could use some help. I would like to compute the electric field near a pylon caused by 6 conductors. I set up the 6 conductors with a potential:...

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Geometry Parametric sweep

Hello, I want to run a geometry parametric sweep. Consider the following geometry sweep parameters: H range(20[mm],10[mm],60[mm]) Z range(0[mm],10[mm],20[mm]+H) The idea is that Z maximum value is...

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Quickly, please: can I set a time delay for a simulation start?

COMSOL'ers: I know there is a way to set a timer up to 24 hours on a Batch Sweep; however, is there a way to do so for any other standard solving steps? A parametric sweep, for example? The...

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Cantilever beam fracture

Hi Everybody I have a question regarding analysis of deflection of the cantilever beam. As it is clear, If I apply a small force on tip of the cantilever it will deflect. However in simulation I don't...

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How to put friction in non newtonian fluid?

Hellow, I really wonder the method to use friction function in 3D. But i couldn't find it... already i did the simulation of friction in 2D. even if the modelings of 2D and 3D are same, results are...

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Use a solution of a very similar problem as initial values...

Dear all, I am generating a phononic band diagram of a photonic crystal (mechanics-analogy to photonic bands...) by sweeping the bloch-floquet k vector from Matlab (i.e. a boundary condition - but in...

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Hi, I wonder how to set the solvers.

Hi, I got the mail box following Error: Failed to find a solution: Maximum number of Newton iterations reached. Returned solution has not converged. So I wonder what the set of solver is suitable. This...

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TEHL-Simulation

Dear Mr. Aksoy, I saw your post on LiveLink to Matlab, where you ask for the mpheval-command and thought that you might be working also on EHL-Simulations like I do. I tried to set up two models: one...

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Error: 7161 The mass matrix is zero - resolve

Respected sir/ma'am, I am trying to simulate a Nano ElectroMechanical Switch(NEMS) using the following modules:a)solid, stress-strain, b) Moving Mesh, and c)Electrostatics. When i run the solver, it...

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comsol generates a reduced mesh when starting second step in conjugate heat...

after building the corresponding model and its mesh which has pretty high resolution 1.5m elements i click on solve, however the solver fails stating that boundaries could not be respected, examining...

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To demonstrate a "sieve" at the particle tracing module

Hi all, now I'm trying to demonstrate a particle sieve using the particle tracing module. I expected that the particles bigger than the pore size of the sieve could be filtered and stuck on the sieve...

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Checking continuity equation

Hello, I'm currently modeling incompressible flow with the Navier-Stokes equations in a Y-shaped pipe with newtonian properties (a fluid similar to water). My problem emerges when I try to check the...

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Set tolerance for continuity - help!

Hello, I've written previously with no success. My model uses the Laminar Flow module to solve the Navier-Stokes equation. One of the equations is a constraint, the continuity equation that states that...

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How to plot the S11 plot of the patch antenna

I want to know how to plot the S11 plot for the patch antenna

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Video plot

I have designed a patch antenna. I want to change the substrates permeability values from 1 to 100 in multiples of 10 and want to view the plot at once in the form of the video. Please help me, how can...

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Difficulty in simulating simple H-Cell

Dear All I m new to comsol. I started to design a very simple H-cell as demonstrated in Videowww.comsol.com/video/video-239 But when I try to simulate i get this error: Failed to find a solution....

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Comsol convergence problem!!!

Hi I am trying a 1D flow module. I use: "coefficient Form PDE" but it gives me error "Nonlinear solver did not converge. Time : 0.001 Last time step is not converged." during Time dependent solver. In...

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weak form PDE

Can anyone help me solve a differential equation (solve for x) using time dependent weak form boundary PDE module. The equation is dx/dt = a(1-x)-b(x). I tried to write expressions x_test*(a*(1-x)-b*x)...

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Solver start and end time

Hello all, I am trying to define the start and the end time of a time dependent simulation using a MATLAB function. This is necessary because the start and end time will be different for each...

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3D AC Coils with Moving Mesh

Hi guys, I'm trying to model a pair of coils, one active with a varying AC current and a parallel passive coil that is suppose to act like a sensor. In this model I'm sending a metallic object through...

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