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Constrained simulation
Hi everybody ! for educational purpose I’m trying to build a comsol simulation of a simple 3D rectangular conductor (of conductivity sigma) in which a current flows BUT solving for the MAGNETIC FIELD....
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Mesh the volume between two mapped surfaces
Hello, Is there any way to generate volume elements between two mapped surfaces? Please, find the minimal simulation file attached. In the end I would like to have one domain (the inner block) meshed...
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Heat transfet with melting front
Hello, I have modeled an ice sample (filled with water in gaps) in "Heat transfer" module. For right boundary i use symmetry, for surface i apply temperature and for other boundaries - thermal...
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Prescribed Displacement in one direction
Dear Comsol-Users, is it possible to prescribe a displacement only for the positive or negative part of one direction? In my Model an ontop metallization will induce thermal stress which leads to a...
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Electric field limits
Hi Im modeling a simple cooper cable electric field distribution I want to know how can I put a range of values that i want to obtain. for example I want to see the electric field lines >2.6KV/mm
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Negative Concentration in Domain
I've been trying to simulate the transfer of ions in a nano-channel using a Nernst-Placnk-Poisson-Boltzmann system, and I'm getting Negative Concentrations in the domain. Can someone help me with...
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Computing Speed Extremely Low in Time-Dependent Solver
Hi All, I used a workstation with 64core CPU，512G RAM to solve 2D time dependent problem, usually when I solve two simulations simultaneously, the CPU usage is around 80%, RAM about 30G, and solve time...
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mode analysis question
Hi All, Recently I am trying to setup a model that can find the waveguide mode that we expected to exist in a special geometry (which has been illustrated in the ppt file). basically, the upper space...
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Electric Field from a point source
Hi, I am new to COMSOL. I want to model a point source from which Electric Field spreads out in x,y directions. I am working in 2D plane. I started of by creating a geometry with air, and then...
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Plot several 1D curves on the same graph
Hi all, It's a question about post processing I'm wondering whether it's possible to plot several 1D curves on the same graph. For example, I have two points, and I want to compare the evolution of the...
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Velocity integration over a cut plane
I'm modeling a fluid flow through a channel. I wanted to do velocity integration over a specific cut plane. The result was NaN. I got a result of velocity integration when I did that over the channel...
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Setting Impedance ...
Hi, could anybody help me how to set an impedance of the conductor, I mean how to allot an impedance value to a conductor...
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convert VTK to vrml, stl
I want to convert vtk to VRML or stl, to import geometry in COMSOL.
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How to give unpolarized light in comsol??
I want to simulate the scattering phenomena through nano rod by incident un-polarized light. Can anyone tell me how to incident un-polarized light in comsol ???
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Piezoresistive Pressure Sensor
Can anyone help me out about the temperature analysis of Piezoresistive Pressure Sensor? I used thermal expansion in the linear elastic material > sweep the operation temperature. But output voltage...
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Another Relatively Simple Natural Convection Problem....
Hello, I have been trying to model a very simple problem of natural heat convection, onto which I would like to eventually add some complexity. Unfortunately, I've been unable to make the simple system...
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Rotordynamics Problem
Hello I wanted to obtain Campbell diagram for the given geometry (image attached). As I am new to COMSOL I wanted to know what is a good starting point to solve this problem.
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modeling of a new viscoelastic material
Hi , I want to model a viscoelastic material . I see in solidmechnics>linear elastic>viscoelastic there are 3 options available 1. generalized maxwell 2. Standard solid 3. kelvin voigt . But my...
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Normal flux problem of transport of diluted species
Hi there, I am solving possoin-nernst-planck equations using comsol. When I combine Electrostatic module and transport of diluted species module together, I apply posive voltage and negative voltage on...
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Phase change of a metal with version 4.4 and version 5.0 does not match why ?
Hi I am trying to make a simulation of a melting process of a square of Silicon 0.5m x 0.5m fixed temperature of 1941K to the left wall and 1687 K (melting point of silicon) to the right wall ( this...
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