RF module 3D plou group , Multislice option
Hi folks, I have a question concerning post-processing capabilities of Comsol. I am using 3D plot group, Multislice option and trying to extract the data from specific slice to text file in order to...
View ArticleStress gradient
Hello, I am trying to simulate the deflection of a cantilever due to stress gradient, how can I define an uniform stress gradient through the cantilever thickness?? Thanks for your help! Andres
View ArticleExporting Probe Data in Matlab
Hello, I'm new to COMSOL and I'm wondering how I go about exporting the probe data within matlab. I have created a time dependent, acoustic-structure interaction model with a few probes located in...
View ArticleWetted Wall BC
Hi, What are the equations for wetted wall boundary condition in COMSOL ? I can not find it. I want to know what exactly happens when you set the contact angle. Is COMSOL using the Navier Slip Length ?...
View ArticleElectrostatics and Electric Circuit
I am relatively new to COMSOL. I am trying to simulate a two part problem. 1. An electric pole is placed underwater 2. A circuit is built around it to measure the voltage drop across a resistor The...
View ArticleSimulating pull-in with contact pair
Hi everyone, I followed the model name "electrostatically actuated cantilever" in model library to build my own model - an RF MEMS shunt switch with fixed fixed beam. In the "electrostatically actuated...
View Articledefining temperature of inlet fluid?
Hi How do I inject a fluid with a required temperature through an inlet? Obviously it's temperature needs to be different from the initial fluid in the model . thanks Dave
View ArticleLine Graph on Cut Line 3D at an angle
Hi, I have created a Cut Line 3D that is at an angle to the x-axis of my geometry (see attached image). For this Cut Line I would now like to create a 1D plot that uses the Cut Line as the x-axis data...
View ArticleStimulation of a tissue with Biphasic pulses
Hi all I want to see the results of the stimulation of a tissue with biphasic current pulses in 2D. AC/DC module, Electric Circuits (ec) and time dependent study are used. There are 3 different...
View ArticleHelp with two group model
I am trying to make the two-energy-group model by using the "Coefficient Form PDE" module for both the fast group and thermal group. I am having trouble to find the correct solution for the two group...
View ArticleElectrostatic Spring Softening in MEMS structures [ resonator Beams]
While I run "electromechanics" module for a MEMS resonator beam, I select "Prestressed analysis Eigenfrequency". Now my question is whether COMSOL considers the Electrostatic Spring Softening which...
View ArticlePrescribe Displacement
Hi everybody, I currently used Comsol to see the force_displacement relation of a bistable nonlinear-cantilever beam, If I sweeping by varying the Force and then caculated Total Displacement, I cannot...
View ArticleThermal expansion of a fluid or gas - how to model ? (renewed)
"How is the intended method to calculate thermal expansion of fluids or gases?" ...... is my whole question in short words Someone asked this years ago, but no answer was registered. see...
View Articlemodeling phase change material help
hi my name is Zeineb I had a problem at the physical resolution(comsol 3.4) of my problem (modeling phase change), I used to ALE and I got this error Time 0: Failed to find consistent initial values....
View Articlecomsol 4.4
hello everyone, I am N.Kumar, i am using 4.4 right now . I am facing one problem like i couldn't see the line (2d) which one created by data set through cut plane section.
View Articlemutual inductance in 3D
Hi There have been some posts on this issue but no clear resolution to the problem. Say we have 2 randomly shaped coils at random 3D orientation. Find mutual inductance with 1% accuracy. One method...
View ArticleRF domain -> EM waves -> Eigenvalue -> Magnetic field plot?
Hello, I have a problem in plotting (or even calculating?) magnetic field in a simple structure and I am using Comsol 4.3a. The structure is a cylinder shape shield (perfect conductor) and inside is a...
View ArticleSplitting up an imported geometry into different domains
Is it possible to import a geometry from a CAD file into Comsol in such a way that it contains more than 1 domain? Till now I made all my geometries in comsol itself. But now I need to make a more...
View ArticleDifference between Imported CAD units and Comsol Units
I have a problem. I used a CAD program (NX 7.5) to create the structure. Now I want to import this structure. The problem is the units in NX 7.5 are millimeters. In COMSOl it is meters. This means the...
View ArticleHeat transfer - defining function to calcutate stress by using calculated...
Hi everybody, I'm new to COMSOL Multiphysics. At the moment I am simulating a heat flux passing through a cylindrical sample using the 2D axis symmetrical function. COMSOL gave me back the temperature...
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