How to define variable regard to time dependent steps?
Hello All I'm running a time dependent AC/DC model, The conductivity of material must be changed regards to voltage differences on two coordinate in each step . I wonder How can I define a variable or...
View ArticleSimualtion of Electrospraying using comsol
Hello How to find surface charge density during electrospraying?How to couple laminar two phase flow with electrostatics? Thanks Alok
View ArticleDeformation in a Tire
Hi everyone, I am currently trying to model a tire going over a ledge and examining the stresses and deformation caused by the impact of the ledge with the tire. I am applying applying 5000 N of force...
View Article1D plot
Hi I simulate the waveguide with mode analyses(2D) in x and y direction, now i want to plot 1D plot in z direction according to x and y how can i do that?
View ArticleGetting capacitance from Impedance/admittance
Good day! I am modeling an impedance/capacitance sensor. I have a static model and the results are very promising, now Im trying to expand my model and model a frequency domain study: the voltage...
View ArticleStep function
Very simple question, but I can't find out how to do it. I have a external temperature, "Temperature 1", which is 100 C. After 330 seconds I would like it to drop 80 degrees to 20 degrees. I should be...
View ArticleThermal expansion model
I am trying to examine the stress distribution in a SiO2 film coated on a thick Si sample with a small Al bump on it, all heated to 700 K. I thought I built the model correctly, but the resulting...
View ArticleHow to solve and verify a ODE equation?
How to solve a ODE equation with mathematical problem? And how can I verify the result correct with the mathematical answer? Thanks for help.
View ArticleState Space Export
Hi , i have build a simple cantilever beam model using time depented model. after defining the points of forces and parameters, i want to export the model to matlb (State Space Matrices) so i could...
View Articlephotonic crystal fiber
Hi , I am an electronic engineer doing master degree research about raman amplificaion by using photonic crystal fiber, I want to calculate the confinement lose by using PML around my fiber strucrutre,...
View ArticleMicroweave frequency function with temperature
Hi I am studying an microwave problem in frequency domain, where the frequency of the waveguide problem needs to change during the simulation. I successufly, made one simulation by definying a...
View Articleimport mesh with the edited *.mphtxt file
Hi, everyone: I have a geometry mesh, and I knew the mesh node's coordinates: x, y, z in matlab workspace. I want to import the mesh into COMSOL , and set the point whose coordinates were knew as the...
View ArticleMultiphysics how to make communication between different physics (same model?)
Hi I need to make a coupling between three physics: - MicrowaveHeating - Frequency Domain - Transient - Non-Isothermal Laminar Flow - Radiation Model My problem is that I required to use the same time...
View ArticleMultiphysics Swirl Flow with Convection&Conduction problem
Hey all, so I am a beginner in Comsol. I designed a mixer in 2D axial symmetry and solved the problem with a given angular velocity w and found the stationary velocity field. Now let's say the mixers...
View ArticleMicrowave heating model with multiple frequencies
Hi, With the Microwave heating model, with a frequency-transient study is possible to simulate multiple frequencies in a well defined bandwidth? I have a input wave with a fixed bandwidth defined by a...
View ArticleHow to plot the relative error?
I've just spent more than a whole day troubleshooting my model. However, if I could plot the relative error over the geometry, I believe it would have been solved in minutes. There was a problem...
View ArticleCOMSOL Error for Initial Values(RF Module)
I am defining a model with different concentrations of oil and water and trying to measure the heat distribution by using the microwaves. But I obtained the error mentioning Initial values: THE...
View ArticlePDE solving or defining force in terms of displacement
Hi, I hope you are doing well, I am a new user of Comsol. At this moment, I am trying to model a cantilever beam with an applied force on its edge as a function of displacement. So, what I need is...
View Articleabout heater simulation in the room
Hello! I am use comsol 4.3a , and use the non-isothermal flow physics to simulate the heater in the room. And the room has a door , and I want to set the door is open, and it is connect to the...
View Article