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:...
View ArticleGeometry 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...
View ArticleQuickly, 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...
View ArticleCantilever 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...
View ArticleHow 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...
View ArticleUse 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...
View ArticleHi, 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...
View ArticleTEHL-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...
View ArticleError: 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...
View Articlecomsol 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...
View ArticleTo 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...
View ArticleChecking 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...
View ArticleSet 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...
View ArticleHow to plot the S11 plot of the patch antenna
I want to know how to plot the S11 plot for the patch antenna
View ArticleVideo 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...
View ArticleDifficulty 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....
View ArticleComsol 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...
View Articleweak 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)...
View ArticleSolver 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...
View Article3D 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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