linear elasticity equation
how can I enter linear elasticity equation in using PDE equation?
View ArticleFailed to find a solution for the initial parameter. Segregated group 3
Hi, This is what I got the error message while I start to run 3D model of PEMFC which is already predefined by comsol. The predefined model itself showing error message while running. Plz suggest....
View ArticleFailed to find a solution for the initial parameter. Segregated group 3
Hi, This is wat the error message I got when I run predefined 3D model of PEMFC from model library. Can anyone suggest whether I can run the existing model of PEMFC from model library? If I get the...
View Articleslide film damping
Hi, I am trying to model slide film damping into my comp capacitive accelerometer. COMSOL already has a model for squeezed film damping. What are the changes I need to make in order to model slide film...
View ArticleFSI Load equation
Dear Expert, I want to model FSI problem with piezaelectric and i have load and deflection on diaphragm and i have displacment and i want tranfer that load to fluid i am confused that which equation or...
View ArticleFSI Load equation
Dear Expert, I want to model FSI problem with piezoelectric and i have load and deflection on diaphragm and i have displacement and i want transfer that load to fluid i am confused that which equation...
View Article2d natural convection
hello everybody, im trying to simulate an inductive heating of a cylinder, my problem is that i cant add the natural convection (between air and the cylinder) i've tried to add an outflow BC but i cant...
View ArticleLiquid Crystal - Director distribution
Hello, I would like to calculate the director distribution of liquid crystals. The formula fs=1/2(K11*(div n)^2 + K22*(n * rot n + q0)^2 +K33* |(n x rot n)|^2) describes the Oseen-Frank free energy...
View Articlehow to definite infinite thickness layer ????
hello, I simulate dual gratings by RF Module . But I do not know how to dedine infinite layer. I want to set a port as the light source in the top of the module. The material of the first layer is...
View ArticleParallel Computing with MATLAB Livelink and COMSOL
Hi everyone, I am currently trying to use Matlab's Global Optimization tool (specifically using genetic algorithms) with my function. Every time my function evaluates, it loads a model file, modifies...
View Articleproblem with fast deformation in geometry
Hi I have to model a fast moving object with shape changing (deformed geometry ) in time domain. as i consider a slow movement and deformation, the simulation is performed. while, considering a fast...
View ArticleHow do I write three functions to one in comsol?
Excuse me. I want to ask a question. when 0=<t<=1, the function is f(t). When 1<t<=2, the function is g(t). When 2<t<=3, the function is h(t). How can the three functions be written...
View ArticleForce calculation gives N instead of N/m
Hi, I draw two beams next to each other in cross-section (a 2D simulation) and apply 1V to one and 0V to the other, and solve for electric field. When I do a Force Calculation in COMSOL v4.3a for beam...
View ArticleQuick question regarding integration order in Generator 2D model
Hello all, I have a quick question regarding the integration order of the z component of the electric field in the example model "Generator 2D". In the example model the order of integration, and thus...
View ArticleMaking the Generator 2D model into a Motor 2D model
Hello all, How would one change the example model, "Generator 2D" into a motor? Is there a way to make the rps parameter of the "Prescribed Rotational Velocity" property be based on the magnetic field...
View Articlemagnetic flux density in seawater
Hello everyone, I am trying to observe magnetic flux density of a coil. I am trying to observe x, y and z component of the field 5m away from the coil. What I expect is that whereever I put the coil in...
View ArticleRF frequency domain scattering electric field module- normalization of...
I am uncertain if I am incorrect in my assumption, so I have come here hoping someone can clarify for me. emw.Ex -displays the scattered electric field emw.Ebx -is initial background electric field...
View Article"Failed to compute elastoplastic strain variables" Help Please
Hello, I am an absolute beginner at COMSOL Multiphysics and I am trying to model the effect of the movement of soil on a steel pipeline buried in it. I have attached the model file with this post. I am...
View ArticleComsol does not finish the calculation even though convergence criteria is...
Hi, I have a rather strange problem with COMOL and hope that anyone can help me. I am trying to solve a "free and porous media flow" on a 3d geometry. The calculation is not converging very well but it...
View ArticleHow do I load arbitrary current to the coil in comsol?
In comsol, I want to give the coil arbitrary current defined by interpolation, but it always wrong. My specific approach is: (a) the global definition, using interpolation method defined excitation...
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