What is Comsol: Definition and 222 Discussions

COMSOL Multiphysics is a cross-platform finite element analysis, solver and multiphysics simulation software. It allows conventional physics-based user interfaces and coupled systems of partial differential equations (PDEs). COMSOL provides an IDE and unified workflow for electrical, mechanical, fluid, acoustics, and chemical applications.
Beside the classical problems that can be addressed with application modules, the core Multiphysics package can be used to solve PDEs in weak form.
An API for Java and LiveLink for MATLAB and Autodesk Inventor may be used to control the software externally.
An Application Builder can be used to develop independent custom domain-specific simulation applications. Users may use drag-and-drop tools (Form Editor) or programming (Method Editor).
COMSOL Server is a distinct software for the management of COMSOL simulation applications in companies.
Several modules are available for COMSOL, categorized according to the applications areas of Electrical, Mechanical, Fluid, Acoustic, Chemical, Multipurpose, and Interfacing.

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  1. A

    What is the conversion factor for hydraulic conductivity units?

    Hi I am new to the forum, I am using darcy's equation to model a tumor - tissue medium. In the literature I found that K - Hydraulic conductivity is given by cm^2/(mmHg.s) But in comsol it's given by (m/s) Is there another term involved in this?
  2. E

    Help to form questions regarding wind flow/convection

    Hello! I'm not sure if this is the right forum for this topic, but my question is very general, not a textbook problem or something like that :) . I work in Comsol where I have imported the topography of mount St Helens and I simulate wind flow around the mountain (as laminar flow) and also...
  3. P

    COMSOL Multiphysics & problem with the outputs usage

    Hi, I use the software COMSOL Multiphysics. I would like to get the solution outputs of the mathematical problem that I run. Specificaly I would like to get pressure and velocity (according to time) of the flow that is flowing through a mean. Do I have this ability in comsol multyphysics? How...
  4. Antonino Tobia

    Space-time varying permittivity in comsol

    Hi everybody, I need to know if someone of you have ever simulated time-space varying permittivity media in RF mode with COMSOL. Thanks to all !
  5. P

    Help in laser simulation in COMSOL

    hi im supposed to simulate a vcsel laser for my thesis i got problem in selecting physics.. i should check its heat transfer and threshold current but i don't know which physics should i choose ! does anyone know about vcsel's physical structure in Comsol ? by the way does anyone know that how...
  6. A

    Who can work with comsol multiphysics software? (spherical quantum dot)

    hi who can help me with my problem in comsol multiphysics? i want to calculate a schrodinger equation for a spherical quantum dot under applied magnetic field, who can help me? anyone here have the program doing this? help me if you can. i don't know if there is another program for compute...
  7. S

    Simulation of poroelastic material with COMSOL Multiphysics

    Good morning, I was wondering if you could help me solve a problem with a poroelastic model with COMSOL Multiphysics. It is a very simple model preliminary to my real study to understand the role of Poisson's ratio on the simulation, keeping all other parameters constant. The model is a...
  8. N

    Simulation of dual porosity in coal using COMSOL Multiphysic

    Hi, I would kindly appreciate it if someone could help me with my simulation problem. I am trying to simulate dual porosity in coal and the interaction of coal matrix and fracture flow. The problem I'm having is I can't assign separate domains with different pressures for matrix and fracture in...
  9. S

    COMSOL problem -- simulate rarefied flow in a microchannel

    hi all i want to simulate rarefied flow in a microchannel i want to apply the heat flux condition on the external slip wall but the external slip wall have a temeprture contition (Tw)! how can i define heat flux condition on the external slip wall? and how can i find or define nusselt number in...
  10. D

    PC Characteristics: Simulation FEM professional purpose

    Dear all, I'm an electric engineer, and I usually work with software as Ansoft Maxwell, Matlab, Ansys, COMSOL... I need a PC for serious professional simulation, and I would like if someone can give me some tips of the characteristics I should ask for this purpose. I don't want to spend more...
  11. H

    Troubleshooting Parametric Sweep and Difference Operation in Comsol 5?

    Hi İ recently started working with Comsol and have a few basic queries. İ am using Comsol version 5. 1. İ am trying to use parametric sweep. So i used it once and saved the file. Now when i try to change the range of sweep it is giving me an error : "parameter list gives empty sweep". When i...
  12. K

    COMSOL Student Copy: Free Academic License

    Hello,
  13. F

    What is the difference between the scattering BC and PML?

    Hi, I want to know what is the proper boundary condition in COMSOL RF module to study optical interactions, Scattering BC and PML? or what is the difference between them? also I want to know if the rules are different for application of these two BCs in far-field and near-fields studies...
  14. I

    Magnetic field of permanent magnet on ansys and comsol

    I have a problem in modelling a magnetic field of permanent magnet on ansys and comsol .I'm very thankful to you if you guide me or provide me a tutorial .thank...
  15. K

    Simulating 1D Thermal Conduction with Vacuum in Comsol 4.4

    Hi, I'm doing a 1D thermal conduction simulation on Comsol Multiphysics 4.4 and my first component is vacuum. I did'nt found the vacuum in the material list. Should I create a new component with a null thermal conductivity ? Thanks
  16. K

    Complicated geometry in COMSOL implementation

    Hello everybody, I am trying to implement a geometry of a human prostate gland derived from MRI imaging in COMSOL and combine it with some cylindrical structures inside the prostate. My goal is to give different parameters to the cylindrical parts of the prostate. However i can combine an...
  17. R

    Help, comsol won't change my mesh size

    Hi guys, I am modelling a simple beam and want to change the mesh size. I changed the size to custom and filled in a maximum element sizes. Comsol doesn't give any alerts, it seems to go fine but when I click build all nothing happens. Maybe I am missing some settings? I have compared all...
  18. A

    Simulating Electrodialysis with Comsol: Troubleshooting Voltage Issues

    hi I want to simulate electrodialises process by Comsol software. my simulation exactly is the same of the electrodialises of comsol. the initial voltage of Comsol is 1 and 1.5 volt but when i increases the voltage (such 5 or 7 volt) the Comsol can't RUN! whats the problem?
  19. M

    About COMSOL use to model Vanadium Redox Flow Battery (VRFB)

    Dear Friends, Merry Christmas to All. I am pleased to join this forum of Physics Experts. Please I need some help to work on COMSOL, I am about to start learning COMSOL. I'm going to work on this topic ' Vanadium Redox Flow Battery ' (VRFB) and this topic has many physics so it can be...
  20. A

    Troubleshooting Ion Exchange Membrane Desalination with Comsol - Low Voltage Fix

    hello to every on i m trying to desalinate seawater with an ion exchange membrane. the initial voltage of my simulation is 5 volt and it increase to 7 and 9Volt when i insert that data to Comsol it doesn't work and give the below error...
  21. Spiro

    Comsol Question: How Does Laser Irradiation Affect Skin Temperature?

    Hello everybody, I am a newbie in Comsol and I would like your help regarding a problem I have. I am modeling the 3-layered human skin (epidermis, dermis, subcutaneous tissue) and I would like to know how the temperature of each layer is affected after laser irradiation on the top layer...
  22. M

    Comsol Mechanical Thermal Contact

    hi, can somebody pls help me with the model i have appended to this post? it is a simple thermal mechanical contact problem but i don't know what is wrong about it and why there is some errors in it after computing. thanks
  23. P

    Can I prevent setting up standing waves in my COMSOL model?

    Can I prevent setting up standing waves in my COMSOL model? I'm using integration over two opposing faces to get the pressure at the 'outlet' - but it seems that no matter what I do to prevent the standing waves, they won't go away. Any help would be great, Thanks
  24. P

    COMSOL - Plane Wave Radiation input not matching Pressure Field

    I have a model set up, that is a cuboid, with a membrane half-way along - a bit like an impedance tube setup. I've used Integration 1 & 2 with Explicit 1 & 2 to define an 'inlet' and 'outlet' at opposing faces of the tube. The Variables for the inlet and outlet are intop1(p0) and intop2(p)...
  25. Y

    How can I simulate buoyancy of water on a solid structure using COMSOL 4.4?

    Hello everyone, I am beginner to comsol physics.I am trying to simulate a task which contains implemented lift force of water on a solid structure(nickel). I need to know where to start from? Which modules should i use and which steps should i take? I looked up an example from comsol...
  26. P

    COMSOL - Structural Mechanics - Membrane - vibration without input?

    I've just got a quick question that hopefully someone can answer. My question is - why does the membrane in COMSOL vibrate without you telling it to? Here are some specifics if required... In COMSOL here are my setup details: - Physics: (3D) Structural mechanics - Membrane Study...
  27. A

    How can I enter a parabolic inlet profile in Comsol for 3D tube modeling?

    hello everyone is anybody here using comsol multiphysics? i'm trying to model a tube which the inlet is a fully developed fluid but the problem is how to enter a parabolic inlet profile for velocity in 2d axisymmetric it is very simple. but my model is 3d i've entered "r" as a variable in...
  28. T

    FE method, how ? (software Comsol)

    Hi all, The plastic flow rule for large strains in a continuum medium can be written as : -\dfrac{1}{2} \Big ( \dfrac{d}{dt}(F_p^{-1} ). ^t F_p^{-1} + F_p^{-1} . ^t \dfrac{d}{dt} ( F_p^{-1} ) \Big)= \lambda F^{-1} \dfrac{\partial f}{\partial \tau} F F_p^{-1} . ^t F_p^{-1} where F_p is the...
  29. H

    Meshing for Distributed Bragg Grating Filter in COMSOL

    Hello everyone! I am simulating a distributed Bragg grating filter using comsol. The mesh i used is like wavelength/index/8, but i do not get symmetric spectrum to Bragg wavelength.Layers are λ/4 width. Is there a special meshing for these Bragg layers? Or is there someone who can give me...
  30. F

    How to Simulate Total Internal Reflection in COMSOL 4.3a Using Ray Tracing?

    Hello, I would like to simulate a beam of light that is incident on a sphere with a refractive index and you get the total internal reflection, I would like to use ray tracing in COMSOL 4.3a. you have any advice on this? thanks
  31. J

    Help in Heat Trasnfer Module of COMSOL

    Hi i am simulating Heat transfer through bimetal that is builded by SiO2 on one side and Aluminium on other side. But when i apply heat source on one side(Aluminium side)the heat do not get transferred to the other side(SiO2 side) through the interface. Only Aluminium side is showing temperature...
  32. J

    Modelling an Micro Thermal Enrergy Harvestor in COMSOL

    Good Evening , i am post graduate student of Thermal Engineering.I have some experience to COMSOL software(but not expert atleast). So now i am doing a project on Modelling a Micro thermal energy harvestor. The problem goes something like this , there is strip made up of bimetal ( material of...
  33. P

    Heat Exchanger Modeling in COMSOL - How to Give Heat Flux at Wall?

    Hi I am trying to model a 3D shell and tube heat exchanger where heat is transferring through the tube wall. For some purpose i have taken the wall thickness to be negligible so i have to give the heat flux at the wall in addition to heat conduction. I have endothermic reaction inside the...
  34. S

    How Can I Analyze the Frequency Response of an Electric Current Shell in Comsol?

    Hello people, i need help with frequency domain study in electric current shell modul. I have one IDC and i have electrodes from gold, and i don't know what should i do to see my frequency response on diagramm? Does anyone has any idea?
  35. A

    Can Anyone Solve the Virtual Memory Issue in COMSOL?

    I have been asking for years how to fix the virtual memory issue in COMSOL. I have 32Gb of memory, and it will use more virtual memory than RAM when there are at least 25Gb of RAM unused. Does anyone have a fix for this? I'm using 64 bit COMSOL
  36. R

    Trying to import an already meshed surface to Comsol for FE analysis

    Hello I'm starting using Comsol, and I have some problems that I want to ask. I have some tessellated surfaces (triangles), and I'm trying to do some FEA analysis. As far as I know, Comsol only supports NURBS surfaces (as .step or .igs), but not meshes. I think that for FE analysis I...
  37. G

    Comsol 3.5x: Obtaining boundary coordinates from irregular geom obj

    I don't have access to Comsol 4.x. I imported a 3D mesh generated from point cloud data and generated a geometry. (A hollow almost-ellipsoid.) I solve my system on the surface/boundary alone; there is no volumetric data. I need to extract 1D data from the surface/boundary at points other...
  38. I

    Efficiently Draw 2D Cut Lines in COMSOL: Step-by-Step Solution Guide

    I am soooo stuck with how to draw 2D cut lines from (b) in this solution set. I know its probably something really simple but its driving me crazy. I really don't know how to define the zeta cut lines and make a sketch as generated in the attachment. If someone could please give me some more...
  39. I

    Moving Mesh Problem in COMSOL.

    I am working over a problem, induction heating of a rod moving inside the furnace with a certain velocity, required to relieve stress from the surface. The furnace is stationary, means the coil while the rod is moving inside the coils. So, I have given the boundary condition accordingly with...
  40. U

    How to become more skillful with COMSOL

    I'm using COMSOL for my undergraduate project-work. I have explored the different options available on the different menus. However, I find that when going through tutorials, a lot more could be done using COMSOL if I knew the software in more detail, and I feel that could be possible only...
  41. S

    Comsol moving boundary with loss of mass

    I need some help!My problem is a problem of moving boundary with loss of mass... I started to use COMSOL and I need to simulate one plate with a hole on the center. And this hole is increasing with the time according to one equation (like a velocity, in m/s) which depend of the stress. Someone...
  42. E

    3D Transport and Adsorption model on Comsol

    Hi everyone, I'm trying to design a simple model by using Comsol Multiphysics. I set an inlet concentration of a species "cp" that will be adsorbed to a circular surface located at the center of the microfluidic cell (I named the concentration of adsorbed protein "cpl" ). I used laminar flow...
  43. parazit

    COMSOL Multiphysics : Bending -Dipole- Magnet Design

    Hi friends. I am so new with Comsol software to design something but I wonder, if it is possible to desing a bending magnet (dipole) and simulate the motions of electrons ? I really would like to do this. Please give me a hand,help me to handle and try to do one together. Best.
  44. G

    Finding a COMSOL Grant for Grad Students

    Comsol grant? Hey PF, I'm a grad student and I have an idea, which I would like to explore using COMSOL. Unfortunately, this software appears to be prohibitively expensive. Does anyone know of any grant/scholarship opportunities available that I might apply for, or perhaps where to look? My...
  45. B

    Temperature field in the flowing gas (COMSOL)

    hello guys I want to simulate the temperature distribution in and out the tube with flowing gas. As a beginner of COMSOL, i just know how to construct a simple laminar flow model. But I have no ideal about how to add a heat souce and how to get the distribution of temperature. wish...
  46. J

    Comsol multiphysics 3.4 project

    Hello, I'm a telecomunications student. I am new here and I have some doubts with Comsol software. This is the first time I use Comsol, and I want to simulate the comunication between two antennas inside a tank with 2 different matterial, air and corn(wheat). I have the electric constants of...
  47. T

    COMSOL: Setting up simple optimization problem

    Hi all, i have some doubts about setting the COMSOL optimization module. My aim is quite simple, i should find the optimal value of a variable to minimize the objective equation. In particular i should set up the parameter C in this equation(which represents the outlet pressure of a laminar...
  48. T

    COMSOL: Problem about optimization applied to a laminar flow

    Hi all,i'm new here and i really hope that you could help me with this problem that is blocking the progression of my graduation thesis. I'm working on a 3D stationary simulation of brachiocefalic artery; I'm using laminar flow physics with a known velocity in inlet and a normal stress in...
  49. K

    Comsol - Balancing of the rotating propeller

    Hi, I am new in comsol. I currently doing a simulation on rotating propeller. I need to obtain vibration magnitude of the rotating prop.. can anyone tell me which type of analysis and how i can get the data? I have been working on this and search over the google for past two week didnt...
  50. A

    COMSOL Moving Mesh - Can you see it before you compute?

    I'm using COMSOL 4.0a. Whenever I apply a free tetrahedral mesh, I can see it on the structure immediately. However, now I need to use a moving mesh to combine the results of structure deflection and fluid flow. I cannot get the solver to compute without errors. Am I supposed to immediately...
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