Modelling a Non linear Magnetic Material
Hi there, So I am currently trying to model a non linear magnetic material. The object is a plate of unknown material. The only information I have for the plate is a BH curve. The magnetic field is...
View ArticleError in sweep. The following feature has encountered a problem:
Hello, This is a problem i am encountering in trying to rum my simulation with COMSOL 5.1. I can't seem to get past here. Attached herewith is my .mph comsol file, you just need to run it and see the...
View ArticleMesh requirements to accurately calculate mass properties
I am trying to model the rotation of a dipole in an electric field. I am using mass properties to determine the moment of inertia, etc of the dipole. I kept getting a divide by 0 error so I've looked...
View ArticleFailed to find the consistent initial values
Dear sir, I am getting an error after solving as follows"Failed to find the consistent initial values Last time step is not converged. - Feature : Time - Dependent Solver1 (sol1/t1) - Error : Failed to...
View ArticleCoefficient form pde in comsol
Hi I want to solve these three pdes in comsol. I am using the coefficient form in comsol. How do I type the first equation in comsol? ∂n/∂t=D∇^2 n-∇.(σ/(1+c).n∇c)-∇.(ρn∇f) The equation has two ∇ terms....
View Articlegeneral question about mass fractions/transport
I have a basic question, I have two reactors in contact with each other, both starting with the same initial conditions (equal amounts); compound#1: solvent Compund#2: A compound#3: B while in one of...
View ArticleCOMSOL crashes when computing
When I try and compute Comsol closes and I get this error message. # # A fatal error has been detected by the Java Runtime Environment: # # EXCEPTION_ILLEGAL_INSTRUCTION (0xc000001d) at...
View ArticleDimensionless study comsol
Hi Is there an option not to have units in comsol 4.4 or 5.0. Comsol 3.5 has this option not to choose units. I can't find it in comsol 5.0.. Attached is a screenshot of the option in comsol 3.5
View ArticleSensitivity analysis in Ray Optics module
Dear All, I am trying to peform a sensitivity analysis in Ray Optics module, but the following message always appears (refer to the attachment). I have an optical scheme which includes also four...
View ArticleThe difference between ux and d(u,x)
I am trying to solve a pair of ODE in 1D using comsol. Along with 3 drichlet boundary conditions, one of the boundary conditions is a constraint equating a function of the derivatives of u,v (dependant...
View ArticleVery simple cantilever pull-in voltage problem
Hi, Im having a problem trying to simulate the pull-in behavior of a cantilever. Essentially, Im following the biased_resonator_2d_model but instead of VdcSP I'm using E_est, a variable for Young...
View ArticleSolid and Fluid motion with eigenfrequency study
Hello, I made a very simple geometry in 2D, such as the cross-section of a microcapillary. I want to find some eigenfrequency which can make a few modes on a microcapillary. So, for the shell I used...
View ArticleSyntax Error
Hello, I am working on a Piezoresistivity, Boundary currents module and a time dependent study. I intend to apply a dynamic pressure load on a circular sensor. I have imported the goemetry from Creo...
View ArticleCalculate the electric potential along a circle
Hi, I'm using COMSOL 3.5 and built a model in the Electrostatic. I want to see the values of electric potential along a circle (for example, x=r*cos(theta), y=r*sin(theta), z=constant, theta is from 0...
View ArticleSimple coupled PDE example
Hi there, as an introduction to more complex scenarios i tried to setup a very simple coupled pde with the coefficient form. I chose a stationary 1D Darcian flow over a length of 2m like this 1....
View ArticleProblem with heat-transfer test case
Hullo everybody. I have a problem with a simple heat transfer test case; please find attached the input file (for version 4.3a). It is a 2D axy-symmetric problem, with a torus representing a coil...
View ArticleSurface to surface radiation problem
Hi everybody, I attach a (simple) test case which is giving me problems. It is a 2D axisymmetric problem, with a coil and a screen. The coil is modeled using a heat source, and there is radiative heat...
View ArticleEcap simulation in COMSOL
Hi! I have to simulate an ecap process with Comsol. The ecap is basically a severe plastic deformation process where a billet is pass trough a die with two channels intersecting at a 90° angle (or...
View ArticleHelp with modeling resistance in current collectors for lithium-ion
Hello, I am not sure if I am in the correct area of this forum for assistance I need. I am currently working on a model for current collectors in lithium-ion batteries. More specifically the voltage...
View Articlesingularity. error
Hello, Does anyboday know why I encounter the below error message in Comsol 3.5a? Error: Time 7.86913096623935e-007: Repeated error test failures. May have reached a Last time step is not converged....
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