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2D surface integrated solution (yz plane) values along a path (x axis)

Hi all, I am trying to plot a line graph for average T vs x-axis for a rectangular microchannel under heated conditions. The average T is the average temperature of the cross-sectional area (yz plane)...

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* 4.3b Webinar * Live Demo of New Features on May 14

Hello COMSOL Community, You are invited to join us tomorrow at 2:00 pm EDT for a free webinar showcasing the new features of COMSOL Multiphysics 4.3b! We’re excited to have Bjorn Sjodin, VP of Product...

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Optimizing with a complex number

Hello again, I am currently stuck with the optimizer. I made a forward model to give me the magnetic field, then using the optimizer, I am trying to get the resistivity of my model, by giving it the...

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Error in swept of a mapped/quad mesh

Dear all, I am getting a problem in the meshing of a multilayer, composed of 3 very thin layers (0.3, 0.01, 0.04 mm). I want to mesh them using a mapped mesh, and then swept (using one swept for all...

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Mode shape change with the temperature sweep.

Dear all I am modeling a hollow sphere of Pyrex. I am interested on the temperature dependence of the frequencies. To veriify the simulation i started with a conventional eiguenfreqeuncy simulations....

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Comsol 4.3b on Mac OS X Lion 1D plot causes freezing

Hi all, I've just installed comsol 4.3b on my macbookpro 13" running mac os x lion. It works perfectly until I try to visualize some 1D plot, e.g. the polar plot group 2 of the model library project...

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shrinking and eventually disappearing mesh

Hello, I'm working a problem where a porous particle is being heated and vaporized. I am using moving mesh with a prescribed normal mesh velocity to shrink the solid domain of the particle (see...

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Error: Parameter lists gives empty sweep

Hello, I would like to know the reasoning behind this error in return of a monotonously incresing series of frequencies. Examples: a) 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 90,...

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3D Poisson equation problem coupled with Nernst-Planck equation

I used coupled Electrostatics physics and Transport of Diluted Species physics to simulate this problem. The source term in Poisson equation is the difference between cations and anions. Usually, the...

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Maxwell Stress Tensor

Hello all, I'm new to Comsol and Im having a little difficulty getting my head around how the Maxwell Stress Tensor operates. I understand its operation when applied to parallel wires (Like in the...

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Using a Gaussian Pulse

Hi everyone, I'm actuallay working on a modeling of a laser pulse which is heating a front of a material in order to determinate the diffusivity, my current issue is that i would like to model my heat...

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Inlet outlet mass flux is not identical

Hi all, I am trying to measure the bulk temperature, but initial testing on the conservation of mass failed as it gave me different results between the inlet and the outlet mass flux. This result makes...

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Port to use for semi rectangular shaped coaxial cable excitation

Hi I am facing problem in assigning port parameters for semicircular coaxial cable excitation. If it is circular then can use coaxial port type also if rectangular coaxial port we can use rectangular...

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Charge induction in semiconductor

Hi, I want to simulate the movement of a cloud of electrons in an electric field, through a semi-conductor material. I used the COMSOL Electrostatics module to calculate the electric fieldlines. Now, I...

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Approach to a multiparticle system: Bacteria in medium

Hi everybody, I have recently started a bioinformatics project at university. It is about cooperation of bacteria so I want to deal with a large number (1000+) of objects in medium producing proteins...

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PML Error: Could not find any cartesian regions

Hi I am new to PML. I am using Structural mechanics module to implement PML in a cantliver to determine the waves propagating to the PML. I am getting this error: Could not find any cartesian regions....

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Properties of N- Octadecane on Comsol thermal

Hello, I with the test similer Comsol software equation heat transfer of a brick containing a phase change material (N-0ctadecane) under varying conditions. I want help on how to report the...

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How to set boundary conditions?

I'm new to COMSOL. Where can I find the options for setting up boundary conditions for a model? I need scattering boundary.

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defining output variable of an interface as dependent variable in global...

I am trying to simulate surface deformation due to magnetic field. My model consists of a cylinder filled with conductive fluid surrounded by a single coil (approximated by a line element). I coupled...

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Two-phase flow physics

Hi there, I have experience dealing with CFD problems with the finite volume method. I use my own code, starccm+ and openFOAM very often. I am trying to make some animations with a multiphase flow for...

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