# What is Multiphysics: Definition and 23 Discussions

Multiphysics is defined as the coupled processes or systems involving more than one simultaneously occurring physical field and the studies of and knowledge about these processes and systems.As an interdisciplinary study area, multiphysics spans over many science and engineering disciplines. Multiphysics is a practice built on mathematics, physics, application, and numerical analysis. The mathematics involved usually contains partial differential equations and tensor analysis.
The physics refers to common types of physical processes, e.g., heat transfer (thermo-), pore water movement (hydro-), concentration field (concentro or diffuso/convecto/advecto), stress and strain (mechano-), dynamics (dyno-), chemical reactions (chemo- or chemico-), electrostatics (electro-), neutronics (neutro-), and magnetostatics (magneto-).

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1. ### 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
2. ### 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.
3. ### 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?)
4. ### Programs for thermodynamics calculations

I know these calculations in thermodynamics can be done by hand or a simple calculator but I wonder if some programs do these calculations. These programs might be called multiphysics programs. An example of a calculation - select piston-cylinder arrangement. -enter initial...
5. ### 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...
6. ### Fluid solid interaction boundary condition problem

I have come across the paper attached in which a 1D fluid piston is modeled. I have question on the boundary conditions (BCs) of the system. Essentially, the problem consists of a fluid chamber in contact with a spring (a mass -spring system). ALE is used to move the mesh. I am not certain...
7. ### PhD Guidance: Seeking Multiphysics Position in Europe

Hi all, First time poster here, and currently looking for some good advice. I’m about to finish my master studies in June and therefore I’m looking for advice. I’m searching for a university that has a renowned department/study group in a specific field of study. I hope to join that study...
8. ### 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...
9. ### 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...
10. ### How to measure displacement and Force simulatuously in Ansys Structural domain

Hi i am performing a multiphysics simulation in which i am importing results of Electric-Thermal domain into Transient Structural domain in Ansys Workbench 14.5. As the simulation time is 5 hrs and given that i have to perform 20 case studies , so i want to know is their a way around in Ansys...
11. ### Unable to get the expected result in Electro-thermal-Structural problem

Good Day, I am working on a problem in which i am coupling "Thermal-Electric" physics with "Transient Structural" in Ansys workbench V 14.5. I am supplying electric energy(Voltage) to a structure which gets heats up due to Joule Thomson effect, and then i connect it's "Solution" to "Setup" tab...
12. ### 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.
13. ### 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...
14. ### 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.
15. ### 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...
16. ### 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...
17. ### 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...
18. ### 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?
19. ### 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 =...
20. ### 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.
21. ### 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?
22. ### Solve Flow Over Topography with FEMLAB-COMSOL Multiphysics and PDE Weak Forms

I have just started to work on FEMLAB.I am using at the moment the PDE modes-Weak forms to solve flow over topography using the lubrication equation. I have implemented the lubrication equations into the subsomain settings and set the boundary conditions but i do get wrong results. Does anyone...
23. ### Multiphysics PDE solvers with solution dependent domains

I'm working on solving coupled PDEs (mass diffusion - heat transfer - continuum mechanics) in problems where the solution domain changes depending on the solution (call it an intrinsic coupling if you will). This happens either due to addition of material to the domain or damage of the domain...