Convergence Problems
Hi, everyone! I am trying to simulate the contact between tire and soil in COMSOL, but I am getting too many problems of convergence. The errors are always like:Failed to find a solution for the...
View Article"Modeling of a 3D Inductor" - Cannot define output
Hello,I'm currently following the "Modeling of a 3D Inductor" tutorial and have run into a strange issue. I cannot define an output for my magnetic field study as the guide directs me to. When I try to...
View ArticleDistributed Frequency Solution
Hi all, I'm hoping this is something simple but I'm struggling to figure it out. I'm new to the COMSOL environment and I'm trying to set up a harmonic solution with a coupled structual-acoustics model....
View Articlewhy the Multiphysics only have Electromagnetic heating? please give me a hand.
don't have other choices. only have the ecletromagnetic heating. my version is 5.5.
View ArticleMagnetic flux density calculation from predefined current density distribution
Hello everyone,I have a model where I can solve for the nodal current density values. What I want to do is to alter this nodal current density information by using MATLAB, then pass this new nodal...
View ArticleCoil Geometry current flow arrow
Hi ,When modelling magnetic field in a coil and configuring coil geomatry / current flowon a linearly sameway current flowing shape , is it necessary to assign all the current flowing arrow on edges of...
View ArticleVacuum pump in laminar flow
HelloDoes someone know what exit thickness mean in a vacuum pump boundary condition??Also I'd like to know if Static Pressure at no flow is just entry pressure - pressure drop or am I missing...
View ArticleHELP ME!!! I HAVE AN EXAM ON 27 OF FEBRUARY!!! (NMR)
I have to carry out a 2D axial-symmetric project that represents the phenomenon of nuclear magnetic resonance; I wanted to ask if any of you had a model already made or something to take a cue from;...
View Articlecalculate optical force by using maxwell stress tensor
I wan to model the scattering of a nanoparticle for calculating optical force ( gradient force ) based on maxwell stress tensor.but I don't know how to set the parameter in comsol, could you help me?
View ArticleInterior Impedance/Pair Impedance for the Pressure Acoustics, Boundary...
Hello,Would it be possible to add the Interior Impedance/Pair Impedance BC to the Pressure Acoustics, Boundary Elements Interface? From my knowledge of BEM I can't see any reason why it wouldn't be...
View ArticleAverage Current Density used in 2D model of Lithium ion battery
Hi, I have been trying to model a 2D lithium ion battery using different electrodes. How do I calculate the value of Average current density to be used? The 2D tutorial sheet takes -50 A/m^2, but they...
View Articlehow to transform a closed Parametric curve in a 2d surface
Hello comsol forumI am trying to simulate scenarios of 2d scattering of a cylindrical em wave from an infinitely long z-directed PEC with a specific cross section.I successfully done this for a...
View ArticleBUG in COMSOL 5.1 on parametric curve design
Hello forumI think i found a bug in comsol 5.1 regarding the parametric curve functionality. Specifically, i wish to design a rounded triangle with expressionsx(t)=0.28(cos(t)+0.2cos(2t)) y(t)...
View ArticleMaximum number of Newton iterations reached
I tried other ways like 'raise number of iteration', 'use more fine mesh'. But it have same error message and when I use more fine mesh, it's simulation time is tooo long (more than 12hr).=======...
View ArticleProblem with sign function sign(u)
Hello,I am trying to sketch a rounded square with the parametric curve functionality using x(t)=2.1sign(cos(t))(abs(cos(t)))^(1/2) and y(t)=2.1sign(sin(t))(abs(sin(t)))^(1/2), and i get a warning...
View ArticleHow to export coordinates of zero contour?
I use the microfluidics level set module to solve a time-dependent two-phase flow problem. I want to export the interface at all times. How to do this?Essentially I just want to export the coordinates...
View ArticleNot specifying boundary conditions for certain dependant variables.
Hi, I'm currently working on a system of PDEs using the Coefficient Form PDE module in 2D for my reactor design coursework. My system requires the coupling of multiple dependant variables with...
View Articlepermanent magnet (Nd magnet)
I designed the nd magnet.In magnetic flux conservation 1 , the z axis was set to 0.5030T.( Nd magnet)In magnetic flux conservation 2, air domain was set to relative permeability. (Air zone)Infinite...
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Issues with meshing domain with many lines
I'm trying to solve a problem where the domain is a unit cube with lines generated via a periodic voronoi tesselation. I require these lines for my physics. I am very often running into issues when I...
View ArticleHow to set units for spreadsheet interpolation functions
Hi everyone,I am using interpolation functions as part of my user-defined material of supercritical nitrous oxide.I created a single file containing all the necessary properties from REFPROP 9.1 like...
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