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Magnetic field components undefined in RF eigenfrequency solutions

Hello, I am simulating a microwave resonant cavity using the RF module (Electromagnetic Waves, Frequency Domain with Eigenfrequency study). The solver gives correct results (eigenmodes look like...

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Out of memory during assembly BUT the mesh number is just 3608

My model is 3D using Heat transfer in porous media, and the total mesh number is only 3608, but the error "out of memory during assembly" still occurred, why? Model file was attached. My operation...

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How to model 2D Fluid Structure Interaction FSI if solid collides with the...

Hello Community! Currently I'm working on a 2D symmetrical model of human vocal folds. The problem is very similar to that presented within the FSI tutorial (Application ID: 361). The differences are:...

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Fail to evaluate variable. (material.epsilonr13)

Hello, I would like to calculate the electric field within a chamber with gaseous xenon filled out all the space. In the meanwhile, there is another hollow cylinder inside the chamber which is made up...

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How to plot the relative error?

I've just spent more than a whole day troubleshooting my model. However, if I could plot the relative error over the geometry, I believe it would have been solved in minutes. There was a problem...

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Linear generator

Hello I am working on linear generator (moving magnet ) and couldn't able to put an expression in Prescribed Mesh Displacement for magnets (Prescribe z displacement in moving mesh ale). Can anyone help...

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Solving a PDE in a volume (3D) coupled with a PDE on it's surface (2D)

I am trying to model a two coupled PDEs using axisymmetric spherical geometry. Here is a picture of the full 3D model:imgur.com/nHTxMDh Here is the axisymmetric reduction which you will see implemented...

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Parametric sweep to boundary mode analysis

Is there a way to send a list of parameters to a boundary mode analysis study step. In a 2Dwaveguide simulation I have a boundary mode analysis step followed by frequency domain. I can send a list of...

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Modeling of contact in fluid structure interaction FSI toolbox

Hello community! I use FSI toolbox for modelling of vocal fold vibrations. The model is 2D consisting of a fluid domain (glottal channel) and a very compliant solid domain (vocal fold) (picture...

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3D Capacitance Parametric Sweep problem - Meshing issue - results in...

Dear COMSOLers and Ivar I have a very simple problem and I have attached two files. Basically i have a capacitor (Terminal 1 and 2) and a human (modeled as a Terminal 3) in the AC/DC electrostatics...

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How can I control the number of load steps in solving nonlinear problems?

Hi, Now I'm involved in nonlinear static analysis, using the incremental force method. I wonder if I can control the number of load steps in the Newton iterations. If possible, please let me know where...

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How to couple two components with two different physics in one model? Fluid...

Hello community! My 2D model consists of two components and two different physics . The first component is "Solid Mechanics" and the second "Laminar Flow". Unfortunately, "Fluid Solid Interaction"...

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Simulating a resonant cavity

Hi I want to simulate my tapered cone cavity to obtain a resonant frequency of that. I made a project but I can't compute that. There are some errors. I attach a project file.

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Setting pressure

I want to study flow in pipe I want to set v = 0.05 m/s AND p = 5 atmat the inlet How to set them both? I mean, under laminar flow -> inlet -> boundary conditions I can choose one or the other,...

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numeric time integral - cumulative sum

Hello everbody, my problem is about combustion reaction in comsol. I want to burn a porous layer of dust. the problem of the reactive flow in porous media toolbox is, that all species are fluids, and...

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How to prevent fluid mesh from degradation in fluid - structure - interaction...

Hello community! I use (fsi) module for modelling of vocal fold vibrations in 2D. At certain conditions the solid (vocal fold) deforms the fluid mesh too much resulting in mesh collapsing /...

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PROBLEM: Nonlinear solver did not converge. Rotating Machinery

I am trying to simulate a stirring reactor, following the instructions of tutorial "Laminar Flow in a Baffled Stirred Mixer", but with some differences: - The impeller is a turbine - Viscosity of fluid...

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How to add inertial lift force and Dean force

Hi everybody, I m doing simulation for inertial focusing. I need to see the effect of inertial lift force and dean force on particle. I m just wanted to know where these forces can be defined. I tried...

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Returned solution is not converged

Hello COMSOLants, I am new to COMSOL and want to do a stationary thermal simulation of high voltage power cables with COMSOL Multiphysics 5.1. I have a soil geometry that is 20m*10m and three cables...

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Parallel computing for COMSOL with MATLAB

I definited a function by COMSOL .m file , whose varibles are geometrical parameters of model. Then, geometrical parameters are optimized by a genetic algorithm written by matlab. There are big...

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