Problem with Mesh Swept
There is something I don't get right with the Mesh Swept option. I used the model "biased_resonator_3d_modes.mph" from the Model Library as a starting point. There they built a mesh on one face of the...
View Articlelong running time
Hey: I hope you all are well, I have a question, when I run my model it takes lots of time to run and finally the analyses wouldn't be completed. and also no errors would be appeared. Now, I am not...
View ArticleVolume concentrations in transport of diluted species module
I am confused by the fact that the" transport of diluted species node" in COMSOL only lets me work with surface concentrations. I want to model a 3D problem that has a given volume concentration as...
View Articleproblem in inputting signal
i am working on SAW RFID using acoustic module with piezoelectric devices physics and i want to input a signal of type S= Acos(wt+p)rect(t/p) to the input IDT and i dont know how to do it .please help me.
View ArticlePointwise constraint in weak form
Hello, What is the meaning of the value of "Pointwise constraint" in Comsol? It is a strong, bidirectional constraint. If the constraint expression is "-x+1", then is the value of the variable "x"...
View Articledependent variables: sweep over "initial values" and "variables not solved for"?
Hello all- I have 2 Studies in my 2D model: Study 1 solves for various fields within my geometry. These fields are different for each wavelength (lam0). Study 2 takes the lam0-dependent fields from...
View ArticleHow to export data on selected points
Hi All I have 1D line plot and I want to export the data of the plot on selected grid points, not the entire plot. Any Idea or suggestion would be of great help. Regards, A.
View ArticleIs wave equation automatically included in plasma reactor interface for...
Hello everyone, I am trying to figure out the domain equations taken into consideration for plasma model node in microwave plasma module. If I create only one geometry in my simulation and specify it...
View ArticlePiezoelectric Ultrasonic motor
How to couple the piezoelectric generated wave to the slider(object) which is kept in friction contact with substrate? so that the slider will start moving, with force of the Rayleigh wave.
View ArticleSilicon onchip Microchannel Water Heat sink
Hi All, I am presently working on a project that involves the simulation of a micro-channel heat sink on COMSOL, i have gone through various literatures and have also followed the microchannel turorial...
View Articlecharge density in flow through capacitor
Dear all, I am relatively new to comsol. I am trying to solve a simple 2D flow through capacitor model with electrostatics module, laminar flow having 0.1 M NaCl as the dielectric medium. In the...
View ArticleVariable exchange between Matlab and Comsol
Hello everyone, I am running Comsol using the LiveLink with Matlab and am trying to do the following: I have a value, dt, which is 0 everywhere in the beginning. (I can either use dt=0, make an...
View ArticleCoupling plate and acoustics
Hi everyone, I'm trying to model a axisymmetric disk in 2D which is actuated with 40kHz in the middle in axial direction which gives a pressure wave in the surrounding air. The air is represented by an...
View ArticleHow To Create Cross Section In 3D
I have been simulating Mie scattering in 3D by using symmetry so that only 1/4 of my model has to be solved for. The problem I have is that I would like to plot the solutions of the full model with 1/4...
View ArticleDifferent results of Simulation from Solid Mechanics and shell
Hello, I have a problem when doing a simulation with a bend pipe meshed by shell element. The results of principal strains are one time larger than meshed by solid mechanics. But the results of...
View ArticleNorton Creep parameters
Hi experts/users, I'm going to simulate creep of polymer by using Norton model in situation which temperature and applied force are constant. I've got question regarding parameters in Norton creep...
View Articledynamic or static pressure?
For some reason, the question I asked in this forum yesterday was deleted, so I´ll post it again..... Hi, I have a simple "problem" when using the "free and porous media flow" physics. The pressure...
View Articleporoelastic pellicle squeezed at a constant rate: unknown error
Hi I am trying to simulate the squeezing of a poroelastic pellicle under two flat plates at a constant squeezing rate. However, an error comes up and I really don’t understand the reason. The error is...
View ArticleAdaptive time stepping scheme for laser pulse train with low duty cycle(1/250)
Hi, I am a new user of COMSOL. I want to simulate the hybrid laser machining process using this software, but the first problem I have to solve is the adaptive time stepping. The duty cycle of the...
View ArticleHow do I load arbitrary current to the coil in comsol?
In comsol, I want to give the coil arbitrary current defined by interpolation, but it always wrong. My specific approach is: (a) the global definition, using interpolation method defined excitation...
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