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.
hi friends
i have a question about the physics of the comsol
How can i simulate the tunelling current in comsol
i mean which physics should i use
i'm using COMSOL 4.2
please help me
Hi,
Here are the details in as concise a manner as possible:
1. I'm using In-compressible Navier Stokes Module in laminar flow, time dependent solution.
2.I have a rectangular region in which I have some fluid.
3.there are cilia inside the fluid, which move with a time and space-varying...
I'm using comsol 4 for plasma modeling but I've read that this module is just for low temperature plasma, does anybody knows the temperature limitation of the plasma in this module? I mean how much is the upper limitation of plasma temperature?
Hello
I am trying to validate my model by comparing a simple axisymetric 2D
impacting flow of air on a surface.
The geometry is simple: a cylindrical (diameter d=26.5e-3[m]) jet of air
(debit Speed Ud=13.46[m/s]) is impacting a surface at distance H=0.2833[m].
Flow temp is Tj=20°C Wall...
So I feel like this should be a simpler problem than most with COMSOL...
I have a simple cantilever (anchored at one end) with a force at some point source which is making it vibrate at some frequency. This is a macroscopic cantilever, so you can ignore viscosity (and most of the other Navier...
I need to develop a simple model in Comsol, but I have no experience with it. I need to see what the convective currents and velocity fields are at certain temperatures in a glass optical fiber. I have the information about the fiber and its dimensions. The fiber is going to be at around its...
Homework Statement
hi there,
I'm working on an annealing furnace. ingots are warmed up in the oven. I'm doing this with a finite elements method called Comsol Multiphysics. This is a pretty complex software program. Can someone please help me with this part of ComsolHomework Equations
it is...
Hi! I started to look into freq response analysis of a cantilever beam using COMSOL. Luckily COMSOL already has an example model "Model Library>> Structural mechanics module>>Dynamics and Vibrations>>rotating blade". While not changing anything in the model and with Omega=0 and Cloris =0, I get...
Hi all:
The solution to my problem requires solving 16 PDE's at once. This shouldn't be hard - but you'll know what my problem is in a minute. The 16 PDE's :
∂/∂t (I+i) + Kn*μi ∂/∂x (I+i) + I+i = I0
∂/∂t (I-i) + Kn*μi ∂/∂x (I-i) + I-i = I0
for i's ranging from 1 to 8.
That comes...
Hi,
I am trying to create two coils with different axes on Comsol Multiphysics 3.5. I use the 2D axisymetric mode but it allows to create only coils with the same axe.
Can somebody help me ?
Thanks in advance.
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...
Hi,
I want to couple two different modules of COMSOL. For example u is the solution of Module 1 and I want to give 0.95*u+a as subdomain settings parameter in module 2. Here a is a vector. I have succeeded with u and 0.95*u to use as subdomain settings parameter of module 2 but when I add a ...
Hi everyone,
I'm working on COMSOL's ac-dc module and I'm trying to find the magnetic field which is created by an electrode pair (dipole). The working environment of the pair has nonzero conductivity and relative permittivity.
I first found the current density between the electrodes in...
Hi all,
I'm trying to run an eigenfrequency analysis on COMSOL. I have the geometry (a simple square plate fixed in one side), the material (aluminium alloy 1050) and the mesh.
However, when I run the solver, I find the famous error 6250. What, exactly does that mean?
Thanks in...
Hello,
I am having some problems with COMSOL multiphysics 3.5a. I am using 2D weakly compressible flow with general heat transfer and am trying to model a natural convection loop.
The Approach I have taken is to use properties of the material for a certain range of temperatures to...
Hello !
I am using Comsol Multiphysics in order to simulate the eddy currents in a damaged/cracked steel circular rod, with a helix coil surrounded it and thus creating the alternativ magnetic field.
Actually, I am having a lot of problem in modelling it, mainly because I am new in using...
Hallo,
i'm trying to implement a comsol simulation of a impedance spectroscopy experiment.
But unfortunatly I'm an absolut beginner in Comsol and i have many problems with this work.
First of all i want to say that I'm using the AC/DC module, more precisely the transient analysis.
At the...
Here's a question for the COMSOL whizzes:
I'm using the COMSOL 3.5a Diffusion Toolbox. I have a 1D reaction-diffusion model that is controlled by a catalyst.
The spatial distribution of catalyst along the 1D space is independent of the other chemical species and I have data for the...
Hello All -
I use COMSOL in the context of groundwater (Earth Sciences Module). I have run across a problem where I am representing, instead of a point source of pollution, a quadralateral geometry (2D) pollutant source (constant concentration source). COMSOL is constantly computing negative...
Hey I am trying to create a comsol model to simulate laser forming using comsol. As a starting point I am using the heating with a moving laser tutorial and adapting from there.
The first stage is to model the beam modes. I the tutorial the beam is treated as being infitesimally thin and is...
Hi all -
I would like to add a periodic inlet flow rate (Q(t) over an entire period T) as a BC in COMSOL. Does anyone know how to do this in 2D axisymmetric Transient Navier Stokes through COMSOL? I'm aware of the periodic boundary condition option available, but really just don't know how to...
Greetings.
I'm new to COMSOL and am in the stage where I know what I want done, but I just can't get the software to do it.
Suppose I model out a metal spring, and fix one end of it in place. I want to pull on the other end, and then plot some value relevant to the deformation of the...
I'm running out of memory on my model help! 3D not axisymmetric! Pictures of geometry and mesh attached. Any recommendations on how to make this possible? This is volumetric flow through a cylinder with a thin membrane attached that is porous and utilizes brinkman's equations.
Hey all,
I am try to model a problem in which one fluid (of known properties) sits on top of another fluid (with different properties) and there is an imposed slip boundary condition at the interface.
I'm wondering if COMSOL has a Slip boundary condition that can be readily used or if...
Hello all,
I have a small problem with COMSOL. I am trying to use the particle tracing feature, more precisely I want to use the boundary coordinates to specify where are the points from which to trace the electrons. From what I understand in the User's Giude, the Boundary Coordinates feature...
Hello everyone, I am trying to understand COMSOL 3.5 and I am interested in Photonic crystal fibres and tapered optical fibres. First of all, could you please tell me what is the background of the layout? When you create a design/object, the rest area is air or I need to define another object as...
Hello All,
I have a fundamental Comsol question that maybe you can help me with.
If I am in say a 2-D In-Plane TE Mode. I am inputting a wave that will propagate left to right. What is the best way solve for the resulting field that is transmitted to the right boundary, regardless of what...
i want to import a designed geometry to ansys or comsol from proengineer but i can't.
(ProE Filetype:*.prt)
in ansys:
it gets no error but continues processing and becomes not responding...
in comsol:
it says" Internal error translating CAD model Output file could not be saved"...
Hi all -
I have a problem that I'm probably going to model in COMSOL and would love to hear some ideas on how to get the proper BCs.
Attached is the picture from Truskey. Essentially, the problem consists of removing waste (water) from the membrane tube at a rate of ~ 1 mL/min with a pressure...
Hello,
I wish to model with Comsol a simple situation: a plasterboard undergoes locally with one 3 ms duration a very short flash (Dirac) and I would like to see the evolution during the time of the wave of heat through volume.
The problem it is that I do not know how to enter a function...
Hello!
thanks in advance for any help you can throw my way!
I am in my masters year of an Acoustical Engineering course in the UK. We have been set a group design project to with essentially setting up a forced convection cycle in a room in order to redistribute the heat from a radiator and...
Hello!
I have to solve a system of PDEs with Comsol and do not know where to start ...
This is the system:
&u_{,x}+v_{,y}=k y+h x\ \ \ &in\ \mathcal{A}
v_{,x}-u_{,y}=k x-h y\ \ \ &in\ \mathcal{A}
u n_x+v n_y=0\ \ \ &on\ \partial\mathcal{A}
\mathcal{A}\ in\...
Hello,
I would be grateful if someone could comment on my problem.
I am trying to simulate diffraction of optical wavelength on a sub-wavelength aperture (aperture diameter/wavelength < 0.1).
What I want to achieve is:
- simulate a geometrical model with an aperture of 15um diameter
-...
Hi everyone. I am starting using Comsol modeling the temperature field of a buried cable installed into a PVC duct (2D problem). I have already solved the problem considering heat transfer by conduction. To do this, I have used the Electro-Thermal Interaction Application Mode (Perpendicular...
Hi all - I've been working on some code in Comsol w/ Matlab that works fine on any machine I run it on - so long as I run it through the Comsol w/ Matlab GUI.
No matter which machine I run it on, the program fails if I run Comsol w/ Matlab through a CLI. Specifically, the geominport()...
Hello,
I'm a 2nd year student, and I'm trying to get to know COMSOL. I'm starting off by solving simple problems with the incompressible Navier-Stokes model, but I keep having trouble with the convegence of the solution.
I keep getting the following error:
"Failed to find a solution:
The...
Hello,
I've been attempting to learn how to use COMSOL and ANSYS to create and model a simple solenoid (iron core, 1000 turns of 26 AWG Cu wire, 1 Amp, 0 Hz etc), ever since I realized my Department always had a license to both packages :rolleyes:.
I've done this using FEMM, and fairly...
Hi,
I've got a strange doubt.I model an elastic diaghfram that move water in piping system (a simple pump) so I've got used the 3D FSI multiphicis. Note that in Comsol's examples is the fluid that move the solid structure: i use the same procedure but for the opposite case.
I create a simple...
Hello everyone,
I am recently doing some 3D scattering simulation. I use a plane wave as the illumination field,specifically i set a cubic configuration surrounded by PML. I chose one interior boundary and set it as Transition Boundary Condition and set the Ex=1 (x-polarized plane wave...
Hi all;
I want to run a parametric Sweep analysis and I want to store the temperature value at just one point in the geometry. Is there anyone to know how to do that ?
Hi Everyone!
I hope someone here can help me with a meshing problem I am experiencing in comsol. What I have is a model which has large scale differences (Ranging from the mm range to the nm range). It seems that with these differences in scale, the free meshing engine has a hard time meshing...
COMSOL help- very URGENT
Hi there...
Can anyone help me to model the wave propogation through a block of material using the 3D electromagnetics application mode in comsol? I want to simulate the attunation in the intensity of wave when it travels through different materials like Si, Ni...
Hi everyone,
Can anyone explain how to use the PDE mode in COMSOL Multiphysics? I used the heat transfer package to model a piece of copper undergoing a change in temperature from 6 Kelvin to 300 Kelvin. Now I want to check to see that I can get the same results with my own equations. I don't...
Hi Everyone!
I hope someone here can help me with a meshing problem I am experiencing in comsol. What I have is a model which has large scale differences (Ranging from the mm range to the nm range). It seems that with these differences in scale, the free meshing engine has a hard time meshing...
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...
Hi,
I have got a simple problem which makes me struggle.
I have a rectangular thin conductive sheet (2D) of width w, height h
and conductivity suspended in air.
I would like to calculate with COMSOL/Femlab the electrical resistance between one of the corners of the conductive sheet and any...
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...
Setup:
I'm trying to make the band structure for a planar photonic crystal with finite thickness, i.e., a quasi-3D problem.
I only want the x-direction band structure. So, I'm using variable floquet periodic BCs for the x-direction boundaries, and 0 degree floquet periodic BCs for the...
Hi Everyone,
I have a thousand data points that create a graph of Copper's Thermal Conductivity as it changes from a temperature of 4.5 K to 300K. These points create a somewhat bell-shaped curve, and I have been trying to find the equation to this curve so I can integrate it. I have...