How can I find the flow velocity of a specific coordinate point
Dear all, I would like to ask how can I find the flow velocity of a specific point (x=105, y=2.5) in my channel (it is shown in the picture). In the graph, if I click at any random point I got 3...
View ArticlePolynomial Issue with User-defined Variables
I have a 2D rectangular geometry that has porosity and permeability values dependent on x-coordinate. Polynomial expressions are used to define the local porosity and permeability. However, COMSOL does...
View ArticleMeshing and convergence problems
Dear Comsolians, I was finally able to draw the problem in 3D in Comsol :), am also a beginner, lol. The way I have modeled the coils is that they do not form a complete closed loop, thus I assigned...
View ArticleError in electric gap
Hey. Can anyone tell me what this means: Feature TCL1 dos not support model imput? Appears to me when I used electrical gap in ac / dc / electrostatics. Thank you.
View ArticleCylindrical anisotropic stiffness
Hi, Problem: Imagine a cylindrical shell, with a certain wall thickness. The material properties of the shell have an isotropic density (rho) and an anisotropic stiffness described by a constant radial...
View ArticleMeaning of "node" vs. "vertex" vs. "degree of freedom" for linear finite...
Hi there, can anybody tell me what COMSOL means by the word "node" in contrast to "vertex" or "degree of freedom" when it comes to the discretization? I have...
View ArticleSplit solid into two domains
Hi, I have a 3D model that I've imported into COMSOL. In Solidworks, I have two features that are separate, however, when imported into COMSOL, they become a single domain and a single geometry...
View ArticleHow to evaluate field data in specific point
Hello everyone, I want to simulate particle-particle magnetic interaction in particle tracing. I wrote down an equation for calculation of interaction force. I need to know other points magnetic field...
View ArticleUrgent (RF)
Hello, I am having a deadline in less than a month and I need really your help. I am trying to build an RF model with a layer of graphene that is going to be shined by light from different angles. I am...
View Articlesimulating moving piston
There are 4 components in my model; blood, blood vessel, brain tissue, and piston Blood and blood vessel are surrounded by brain tissue and piston crushes down brain tissue with 1mm depth. When I used...
View ArticlePipe flow module for turbulent flow in the pipe
Hi all, I have just discovered the brand new pipe flow module. it looks amazing. I was wondering if this module is suitable for turbulent flow in the pipe as well. I haven't seen anything regarding...
View ArticleMeshing over large changes in scale
Hi Everyone, I am trying to mesh a geometry which has a large difference in scale between components (from mm to nm scales). The free mesher always fails with Error: 4029 Failed to insert point. - x...
View ArticleGraph vs Phase with Frequency Domain Solver?
Hello, Im sure this is pretty simple, but im still learning COMSOL 4.1. Im using a frequency domain solver, and I have a solution, I can build a video across a full harmonic, with the dynamic data...
View ArticleHow do i can input electron mobility as a function of electric field?
Hi every one, Im trying to input mobility of electron as a function of Electric Field but it give me error. Thanks Azadeh
View ArticleAsk the question about the particle tracing module.
I have a question when I have used particle tracing module(fpt). Because I try to utilize the condition of Particle-Particle Interaction. I don’t know how to define the interaction force of particle. E...
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 ArticleHeat Transfer
Actually, I need to give boundary condition to one of the part of my system. At that part, I will use cryocooler of capacity 1 W at 4.2 K, how can I give this boundary condition to particular part. My...
View ArticleSpiral 3D inductor Geometry
Hello I am trying to simulate a 3D spiral inductor, but I cannot find the right geometric shapes given in Comsol 4.3a to build this coil. I have attached an image of the intended coil I want to build I...
View ArticleThermal Stress Evaluation without Solving Heat Transfer Physics
I am trying to generate Thermal Stress about the domain of a spherical body with a coupled 'Solid Mechanics' and 'Heat Transfer in Solids' physics. Instead of actually solving the heat transfer...
View Articlethe free vibration of the cantilever
Hi everyone: The initial displacement D=1.05mm, is placed on the end of the cantilever beam, to solve the velocity response of the beam end. First, I select space dimension 2D, and add physics Beam,...
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