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harmonic perturbation
I have a question about harmonic perturbation I assigned a 1 A current to a cylinder in mf physics using multi-turn coil and solved it with a 60Hz frequency using frequency domain. If I assign 0.1 A to...
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How to plot required results??
Dear sir, I wish to create an imaginary plane in required location of my model and plot the results like Maximum, Average and Minimum temperatures at that particular plane. How can I do that?
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dT/dt
Hi I cannot work out how to get dT/dt ( temperature variation rate) when using COMSOL. I am a beginner and currently using a version 4. I am modelling the heat transfer of a thin pyroelectric solid and...
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Forced Vibration of Vertical Simply Supported Beam with 'Overhang'
Hi, I'm trying to simulate the forced vibration of a beam that stands vertical and is supported by two simple supports that are shaken back and forth by a motor as in the attached schematic. I've also...
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PML Scaling factor in COMSOL 4.3
Hi, I am doing a 3D simulation with COMSOL 4.3 to find the field distribution and the mode of a waveguide where all the cladding, the core and the substrate have different refractive index. I have...
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Vibrating horizontal plate.
Good Evening everyone, I have a really simple question, I'm sure someone knows the answer to my problem. I'm trying to make a model of a plate, platform, anything you want to call it, that vibrates...
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4 Point Bending of a Multi-Layer Bar with simultaneous phase transformations
Hello all, I have been trying to simulate a 4-point bending test of a multi-layer bar with a geometrically simple 2-d model on COMSOL 4.3a. For the better understanding of the case, The bar consists of...
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How to set initial velocity in level-set method two phase flow for one phase
Hi guys, I am trying to set the initial velocity for a droplet as fluid 1, how can I set an initial velocity for the bulk of fluid (for example the the continuous phase or the drop) in level set...
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problem of self-defined parameter and build-in variables
I am using poroelasticity module. I have a problem about the self-defined parameter and build in variables. I defined shear modules,G, as a function of axial displacement, w (a build in variable), and...
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Running the simulation for the required time span in more than one times (loops)
Dear sir, My requirement is "Running the simulation for the required time span in more than one times (loops)". I actually do not know the initial values of temperatures of the room that I am going to...
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magnetic forces direction in post-processing
Hi all, I have made a 2D simulation for the stress distribution due to magnetic forces in a synchronous reluctant machine, I want to show how the forces act on the boundaries of the stator teeth and...
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COMSOL Failing at Simple DE?
I've encountered a very simple problem with COMSOL's eigenvalue solver and I was wondering if anyone else has had the same problem. I'm trying to solve the simplest DE imaginable. I'm trying to find...
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Swept mesh and Grid independent results
Hi, I want to know whether it is possible to swept a mesh along a direction that takes 90 degree turns (A square pulse in 3D). Also I am facing a problem with the mesh independent results. I am...
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What does it mean to have imaginary part for the force (AC/DC module)?
Hi, I am running a simulation to calculate the force between two conductors carrying AC current. I used MF with simple two circles of copper and surrounding of air. I set current density 200 in z...
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Define a function like Linear elastic-perfectly plastic behavior.
How can I define a load which increase linearly up to time t0 and then stay fix by time. I defined something like "F*(rm1(t<t0)+step1(t))" which step function location is time t0. the only section...
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Moving mesh ALE
Hi, I am simulating a moving boundary with ALE method. My program is working fine with a certain geometry, mesh and time, but if I would like to change the geometry or set a larger time, then I get a...
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surface to surface radiation without surface
Hello, I work on a molten charge and i have some issues with radiation. Usually i use a surface to ambient radiation condition but it is not enough precise for my problem, i have to take into account...
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Applying time derivative as a dirchlet boundary condition
Hi, I need to apply the time derivative of a displacement created in a piezomaterial as the velocity for a fluid boundary..... Could someone please let me know as to how this can be handled in...
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Comsol RF module norm and phase
Dear all, I have a problem with Comsol, a very naive one. I am trying to do a harmonic simulation (a single frequency in frequency domain model) of the EM scattering in a domain. For example if I have...
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Skull and Electrical Conductance
Hey, I'm just a beginner with Comsol and I'm trying to build a model of a human head that includes a top layer of skull, a brain, and space in between the two filled with some kind of conductive...
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