Boundary Condition
I am trying to insert a parabolic boundary condition in the inlet of my pipe flow model. The equation is like U=Umax(1-(R/Rmax)^2); I do know the value of Rmax & Umax. But R is a variable one. How...
View Articlelock symbol in node
Can anyone explain what this lock symbol denote in comsol? Screenshot attached. Looking for a quick reply.
View ArticleElectric switch in circuit
dear all, Hoping all is well with all of you.Kindly how to make a switch in electric circuit.. kindest regards samar akef
View ArticleParameter estimation + Parametric sweep
Hi,I am tring to perform Parameter Estimation on a set of measured data. I am using a Stationary Solution to solve the Helmholtz Eq and a Parametric Sweep to vary the width of a wire. As you may be...
View ArticleDivision by zero, Failed to evaluate variable, Failed to evaluate Jacobian of...
Hello, I am using comsol to model conjugate heat transfer and fluid mechanics under turbulent flow regime. But I keep getting this error below:Division by zero. - Function: / Failed to evaluate...
View ArticleQuestion regarding COMSOL meta-material tutorial
Hello, I am looking to use COMSOL to create a simulation involving the interactions between photons and a resonator.I found a large amount of benefit looking through this tutorial on the matter...
View ArticleMagnetic Fields Time Dependent Solver "Failed to find consistent initial values"
Hello!I am attempting to model an oscillating magnetic field in the X-Y plane using 2 pairs of helmholtz coils connected to sinsusoidal current sources together with a steady state background magnetic...
View ArticleElectromagnetic Energy Harvester
We are currently trying to simulate an electromagnetic coil induction to generate electrical power. The system consists of static planar coil and vibrating membrane with attached permanent magnet...
View ArticleCOMSOL keeps giving error upon restart (vector parameter definition)
Hi!I tried having a vector as a parameter in the global definitions, but immediately it turned out it did not work (it turned red), so I deleted the parameter. Now, I am trying to make a simple app out...
View Articlewhat is the meaning of the magnitude and direction of the arrows on the...
The arrow surface with local velocity is plotted. Does the velocity is the particle velocity? since the vibration of the particle is simple harmonic vibration, why the directions of the arrows are in...
View ArticleFeature: Solveur stationnaire 1 (sol35/s1) Attempt to evaluate nonintegral...
Bonjour, Jes souhaite simuler un réacteur catalytique: les réactifs sont en phase gazeuse et le catalyseur est introduit sous forme des particules.Pour se faire,j'ai commencé par un modèle en 1D où: -...
View ArticleQuestion about Adaptive method for Curvilinear coordinates
COMSOL v5.x has possibility to use an Adaptive method in order to define Curvilinear coordinates system (https://www.comsol.com/blogs/defining-curvilinear-coordinates-anisotropic-materials/). According...
View ArticlePipe with increasing diameter
Hello I am trying to simulate how the flow profile will change when a pipe diameter increases. How can you vary the diameter within the same geometry? Thank you!
View ArticleGeometry Shape Order
Hi Everyone,I am trying to simulate a simple MBB problem (with filleted corners) using the Solid Mechanics interface. I am playing around with the Geometry Shape Order option, I am trying to make sure...
View ArticleFailed To Evaluate Variables And Jacobian Variables
Hello everyone, I am trying to solve a phase change model in 5.3a version of a shell and tube heat exchanger and getting the problem, i have tried a lot but unable to find the solution can anyone help...
View ArticlePolar plot in eigenfrequency analysis
Dear all, I am doing an eigenfrequency analysis of an unstable rock block to compare it with the modal analysis results I obtained with the accelerometer data that have been collected on the unstable...
View ArticleUnderstanding Surface to ambient radiation process
Hello everyone!!! Is there any specific method to do surface to ambient radiation? Can we do it by Diffuse surface? What exactly is the difference between surface to surface and surface to ambient...
View ArticleFactorial Operator in COMSOL
Hello, I am trying implement a function that contains the factorial operator: n! = (n)(n-1)(n-2)...(1), where n is a positive integer.I cannot find this in the "Operators, Functions, and Constants"...
View Articlebeam end release - hinge Beam
Hello. I use BEAM finite elements. I would like to connect two or more BEAMs through an internal hinge, is it possible?In other software you can do it via the beam end release.
View ArticleDoes anyone have a 1D example of a LiFeP04 (LFP) battery
It seems that the recient capacity fade webinars use LFP examples yet COMSOL has no demos or examples of the implementation. Is it because the COMSOL LFP model is too sensitive or fragile to...
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