welding simulation
hi, i am trying to process model tig welding of metal. i solved for temperature profile in my 3d comsol 4.2 model. Now how can i define the elements which are greater than melting temperature as...
View ArticleSimple question regarding parametric sweep of eigenfrequencies
Hello everyone, I have been an avoid reader of the forum for a while now, and have done my best to find the answer to my question, but I am still getting confused. My model is very simple. A 2D disc...
View ArticleUsing stationary computational results as the initial condition for...
Hi, I'm kind of new to transient analysis in COMSOL and I have a few questions. Is it possible to use the reults of a stationary study as the initial conditions for transient analysis? For example, in...
View Articledrying of pear in rectangular shape
Hello, I'm new in comsol, i want to simulate the drying effect of a fruit (pear) in rectangula shape. I'have just started ,so I want to use fick law to determine D (m^2/s) and h (m/s), and then add...
View ArticleLoad vector is always zero vector in linear problems? Hmm...
Attached is a model with one 1D element and 2 Dirichlet-type BCs on both ends of it implemented similarly to Chien Liu's blog post here: www.comsol.com/blogs/implement...k-form-in-comsol-multiphysics/...
View ArticleStructural Mechanics: Out of plane displacement and buckling
I'm trying to model the deformation of a ribbon of SU8 with a pattern of cuts (kirigami) undergoing a 1D tensile loading. The loading is kept in the xy plane, but the force causes a twisting of...
View ArticleFSI Problems
I am new to COMSOL and currently have a time dependent FSI model with numerous problems. The model is that of a fluid flow over an elastic material that should (hopefully) deform similar to the example...
View Articlecoupling solid mechanics with magnetic fields
Hello, I'm currently trying to analyze the change of magnetic flux that is made by a 3D magnet that is adjusted on a periodically moving beam. (Physics: SOLID, MF and Time Dependent) But unfortunately...
View ArticleImplicit equation solving involving spatial and time dependent variables.
Hi! I am trying to solve implicit equation involving spatial and time dependent variables. For ex: iloc=exp(phi1-phi2-iloc*R), phi1 and phi2 are potentials which are space and time dependent. If i...
View ArticleTracking Residual
I need to track the residual in my simulation in order to represent how closely the governing equations are being represented. I know comsol keeps track of residual since ive had several errors...
View ArticleScaled variables
Hi, I don't fully understand the meaning of "scaled variables", especially in relation to the solver settings. For example Comsol manual says:"The absolute-tolerance parameters are used for...
View ArticleCoupling magnetic field (no current) with solid state BH curve
Hi All, I want to model magnetostriction phenomena. I found an example (nonlinear_magnetostriction.mph) where the magnetic field is created by a coil (current density J0) and which uses Magnetic Field...
View ArticleCalculated initial values NOT the same as specified
I have seen this now in 2 simulations... The initial values specified in Initial Value Domain nodes are NOT the Initial Values the solver ouputs, either at t=0 of the solution nor when asking the "Get...
View Articlehow to plot error vs iteration number comsol?
All I can see is the "reciprocal of step size" vs "Time step" in the progress window of the solution but I do not know how to plot error vs iteration number in comsol. Can I do it real time or it will...
View ArticleRun-time and memory requirements
Dear all, After a model has been solved by Comsol, the message window always shows the solution time. Is there a way to also check the memory requirements (RAM used) that were needed for the model to...
View ArticleTime Dependent Domain
Hi everyone, I just started using Comsol 3.5a for simple university exercises but I find some problems solving a transient system. I have this heat transfer problem: for a total of 60s I have a square...
View ArticleCoupled PDEs for Maxwell-Schrödinger system
Hello, For my Master Thesis project I am required to solve simultaneously the Maxwell's wave equation for the vector potential A and the Schrödinger equation for an hydrogen atom in the field of an...
View Articlesolution as initial condition.!
Hello all, I have solved a model of flow over a sphere initially with stationary solver, and I have used this stationary solution, as initial condition for further time dependent study. I got the...
View ArticleCOMSOL crashes suddenly after reaching a certain amount of RAM
Hi there, I am trying to solve a fairly simple model of two concentric cylinders with the inner one rotating and the external one fixed. The model has a fairly large mesh so I am running it on my...
View ArticleElectric Field dependant Equation entry in COMSOL 5.2
If I want to express that the conductivity of the material depends on the Electric Field in Y direction (Ey). How should I write Ey in the equation in this case. I want to know how I can make realize...
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