Solving a system of coupled PDE
Hi, I try to solve a system of coupled PDE with Comsol. Unfortunately, I have problems to choose a suitable solver. Details of my question and a model file are attached. I would be very grateful for...
View Articlewhat does the "exclude algebraic" error estimation option do?
I'm working on a time dependent convection-diffusion simulation. The Peclet number is 10^3 to 10^4. The maximum Reynolds number is ~100. The solution tends to diverge at a point where the input...
View ArticleModeling a Kerr Effect
Hello. I want to model a material with birefringence that depends on the electric field inside the medium, similar to the Kerr effect where the index depends on the square of the field. This is...
View ArticleGeometry variation within Time-Dependent solving.
Hello, I was wondering if it's possible to change geometry according to time ( via internal or external function(MatLab)) ? ie: Making a block depth function of time.
View ArticleWork on COMSOL through MATLAB?
Hi, I would like to run COMSOL through MATLAB but don't understand how? For example when I have saved a COMSOL simulation as M-file and tries to open it in MATLAB it won't open and I am not sure how to...
View ArticleHow to save deformed geometry so that it can be used as new initial geometry...
Hi. I am looking the ways to save the deformed geometry at the end of analysis, and i would like to use it as a completely new initial geometry for further analysis, by clearing out the previous...
View ArticleSolving a system of coupled PDE
Hi, I try to solve a system of coupled PDE with Comsol. Unfortunately, I have problems to choose a suitable solver. Details of my question and a model file are attached. I would be very grateful for...
View ArticleShallow water waves model in coefficient PDE or general PDE
Dear All, I want to solve the Shallow water waves equations in PDE module in 2D. h is the water elevation, U and V the velocity components along x and y. How can I implement an incoming pulse in the...
View ArticleParticle Selection
Hello, I running a simulation to release particle in an electric field and observe their tracks. I wish to find out how many particle and how fast they reach a certain boundary. I have been able to...
View ArticleHow to use compressible gas flow .
Hi I am trying to find a module for doing the analysis of a gas flow in a little 2-d chamber where I am using a compressible gas at a predefined pressure from a tank ranging from 3-6 psi-g at the inlet...
View Articlehow to apply two phase voltage in an Piezo Divice
Hi, I modeled a piezo actuator driven by two phase voltage that one is 90-degree behind, that is sin(wt) and cos(wt). Now I'm doing a frequency domain study，BUT how could I applied the voltage? I've...
View Article3D Model of "Voltage Induced in a Coil by a Moving Magnet"
Hi I wanted to do the 3D version of the Model "Voltage Induced in a Coil by a Moving Magnet" which is in the Comsol Library. I used the same physics, materials and boundary conditions, but...
View Articlewater hammer
hello to everyone well I'm a student and hydraulic master2 I presonte memory of my study is to fain ^ ^ analysis of a battering ram in a pipe under COMSOL aep ^ 10 next joure. I have download COMSOL...
View ArticleInterrupt studi
Hello. I am new to COMSOL and I want to ask how to interrupt study in some condition and change the parameters of the model? Thank you. Goodbye.
View Articleacoustic and structure deflection couple field
hi, I am interested in finding out the sound pressure generation when we release pressurized air on the diaphragm of pressure(air) horn, Till now i have modeled 3d model of air horn, plz suggest me...
View Articleinitial value for eigenvalue study
Hi everyone I'm running an eigenvalue problem and for every "search for eigenvalue around" value that I input, I am getting totally different eigenvalues. I was wondering how much this value affect the...
View Articlethin layers
Dear all, I am analysing the waves induced inside a thin layer using a shaker. I apply a sine wave on one of the edges and the analysis is in the time-domain. I am using Comsol v4.0. Altough I am using...
View ArticleIncorporating Lagrange Multipliers
Hello again, Thanks to the help of those on the forum I was able to incorporate weak constraints to get accurate flux calculations in my diffusion models. However, I am trying to understand how exactly...
View ArticleDeformed Geometry
Hi all, I have a lo of questions and responses related to that but I haven't been able to find a proper solution to the problem I have. Basically, I have a first geometry (domains 1 and 2) which is...
View ArticleMass in not conserved even in conservative form, multiphase flow of water...
Hello everybody, I have previously posted on a problem I was trying to simulate about multiphase flows (Multiphase Flow LS - Air Bubble in Water Cylinder - Conservative forms fails) and I have tried...
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