# What is Comsol multiphysics: Definition and 26 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 Solve PDE w/ Comsol 5.3: Numerical Solution & Time Evolution

What is the best way to solve numerically the following equation using Comsol 5.3. ##\frac{\partial T}{\partial t}=\frac{\partial ^2T}{\partial x^2}+\text{St}\left[1+\left(\frac{\partial T}{\partial x}\right)_{x=0}\right]\frac{\partial T}{\partial x}## ##T(0,t)=1## ##T(\infty ,t)=0##...
2. ### Engineering COMSOL plot of thermal radiation from heated surfaces -- Help please

There is heating of the surface of the material using an electron beam. It is necessary to calculate how much heat will be released and build a graph of dependence. Please tell me how this can be done, which modules in COMSOL can be used?Thank you!
3. ### COMSOL: Newton's Iteration reached - Stress testing sensor

It is a sensor with a fixed surface and a prescribed displacement on the opposite To remove this message error, I have tried to Increase iterations Refined mesh Applied parametric studies And some other ideas from forums However it still cannot be solved It also has a warning of MUMPS out...
4. ### COMSOL: Why does the prescribed displacement stop at a certain point?

I have been experimenting in producing some strain to this object. However, after applying a prescribed displacement and setting it to a certain value, it does not exceed 2.18[um] no matter any extreme value for the prescribed displacement. I have also experimented with an applied force as well...
5. ### Laser shock peening in comsol

Hello, I am trying to learn comsol but I couldn't find how to apply the pressure that changes respect to time and space. I have pressure function from articles that I read but couldn't implemented on comsol, and in most studies people make the simulation with Abaqus software so I am not sure...
6. ### COMSOL: stress on a sensor, how to use infinite element domain?

At the risk of waiting hours on simulations of a sensor, I was wondering if I could use infinite element domain on COMSOL to simplify it. The first image consists of what I would like to simulate but found out that the simulation time is a huge factor as I have a lot to simulations to conduct...
7. ### Treatment of source term on the boundary: FEA and Comsol

I would like to solve a coupled system of two PDEs using Comsol for the following geometry: Equation 1 (valid for 0⩽Z⩽bm): The initial and boundary conditions are: Tm(r,t→0)=20 Tm(r→rw,t)=70 Tm(r→∞,t)=20 However, for bm⩽Z⩽bm+b2, the equation to solve is: With the following initial and...
8. ### A COMSOL Multiphysics- Mathematics

Hi everyone, Has anyone tried to model Radiative Transfer equation on comsol? I am stuck at defining the integral term which includes scattering. Also , how do i make my functions have 3 variable dependence as RTE has dependence on position, time and direction vector
9. ### I Personal COMSOL challenge (EM)

Hi Y'all For the purpose of exploring COMSOL, I challenged my self to plot the E/M-fields of a piece of current carrying wire in 3D. It's quite a simple task to plot the fields inside the wire, but I fail when plotting the fields outside the wire. For plotting the outside fields I have...
10. ### Interfacing Garfield++ with COMSOL

I am trying to simulate a Thick-GEM detector in Garfield++. In order to do so, I need information of the field maps which I generate using COMSOL. I've already extracted the mesh data and the potential data. For the initialise function, I need another file that gives dielectric information of...
11. ### Solar cell absorption efficiency in COMSOL Multiphysics

Hi. I am studying the effect of plasmonic nanoparticles on solar cells. Is there a way to calculate absorption efficiency in different layers of tandem solar cells in COMSOL Multiphysics.
12. ### Metal boundary and PML in Comsol

Hello What is Metal and PML boundry condition in Comsol? How can i specify metals and insulators ?
13. ### Graphene simulation in Comsol Multiphysics

Hi All How can i simulate Graphene in Comsol? I am using semiconductor module . I s it correct to use Drude model? Drude model is in RF module but my simulation should be run in semiconductor module. How about Kubo formula?(for optics application or no?)
14. ### 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...
15. ### 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...
16. ### 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...
17. ### 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.
18. ### 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...
19. ### Need help in comsol multiphysics

Hi guys, i simply don't know how to start tis thing with... please help... P/S : pls find the attached.
20. ### Someone can help me with Comsol multiphysics?

Hello everyone! I'm a new entry in thi forum and I need some help with Comsol multiphysics. I'm creating a model of tsunami waves propagation in a defined domain using the PDE interface. I ve not problems in stationary case, but when I try in time dependent case Comsol give me the error...
21. ### Finding Velocity from Force, Comsol Multiphysics (transient)

Hi, I am using Comsol Multiphysics to model a magnetic plug surounded by water in a tube. The plug interacts with a magnet and a force is induced. Since I am using the ALE moving mesh option, i have defined the boundaries of the geometry to move with the velocity of the plug. This...
22. ### A liquid/Gas simulation with Comsol Multiphysics

Dear Friends ! I would really need Your help. I am currently simulating the temporal development of an interface between liquid and gas, by using Comsol Multiphysics. The problem can be simplified in terms of a rotating central liquid pick up (a small rotating cylinder endowed with an...
23. ### Comsol Multiphysics Heat Transfer

I have a problem where the coefficient of thermal conductivity changes as temperature changes. Where/how do I input this into comsol?
24. ### Comsol multiphysics; fzero and inline function with many parameters

Hi I'm trying to get comsol multiphysics to first define an inline function with 1 variable and 4 parameters, and then run fzero on that same function. I can do it with two parameters, but no moore. This works: clear myfun=inline('exp(y).*cos(x)+z', 'x', 'y', 'z'); x1 =...
25. ### Comsol Multiphysics: Electric Double Layer Modeling

Hello everyone, Does anybody use Comsol multiphysics here? I am trying to model the electric double layer. If you have experience, please share with me.
26. ### Solving System of Differential Equations in COMSOL Multiphysics

I want to solve a system of differential equations in comsol multiphysics. So far I have not figured out how to enter a 2nd pde in addition to the existing pde. Is this possible, and how?