2d 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 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...
View ArticleDifferent current at two ports
I am simulating a device in electrical currents model, and find the currents in the only two port are not the same. And what is more, the current in the electrode with higher voltage is confusing. I do...
View Articlehow to create a loft?
Dear all, I am trying to create a tapered wing (with root chord 200 and tip chord 150). like in any CAD software you have a option called loft, using loft you can easily create a tapered wing. But i...
View ArticleVibrating plate at air and heat transfer
Dear All, My model is 2D vibrating plate at air that blow air to a hot cylinder, I used Fluid-structure interaction to model the vibrating plate and air domain, notice that there isn't ant inflow and...
View ArticleDifference between Initial Stress and Boundary Loads
Hello, I like to get some help in the basics. I have a 2D axisymmetric model of a thin membrane. The ends of the membrane are fixed at the outer edge using Fixed Constraint node. The membrane has a...
View Articlemutual coupling waveguides
Hi everyone, I am trying to model two oppositely located waveguides for heating fluids. I am using 4.2, Electromagnetic waves in RF module and non-isothermal module in heat transfer module. I am trying...
View ArticleEmpty parameter list
Hi everyone, I'm beginner to COMSOL and I'm modeling hyperthermia cancer treatment with magnetic nano particles. I'm using bioheat transfer for the body cells, mixture model for modeling nano particle...
View ArticleMaximum number of Newton iterations reached
I have imported a 3D meshed model from simpleware to COMSOL 4.3b. Some of the materials of the model are Hyperelastic, Neo-Hookean. While running the model via Direct Solver at 99% of progress there is...
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