Automatic remeshing depending upon the gradient of the solution
Hello, everyone, I am solving a nonlinear equation on the plane. Its solution, u=u(x,y) is everywhere close to zero except for some region in the vicinity of the coordinate origin. This region is not...
View ArticlePostprocessing in cyclindrical coordinates
I am doing a plane strain analysis of a pipe with a crack in it. I would like to get the stress components in the cyclindridcal coordinate system (radial, hoop stress) rather than in the cartesian...
View ArticlePressure in Reacting Flow in Porous Media
Hello All, I am running a model in 4.3a with the node "Reacting Flow in Porous Media," and simulating groundwater flow in a confined aquifer. When I look at the results, my average pressure gets down...
View ArticleCloth or flag modeling
Hi all, Does anybody have a COMSOL model that simulates a cloth on a table or a flag moving under a wind flow? Cheers, SL
View ArticleMoving Mesh problem/ Electromagnetism / Induction heating of rod
Dear Ivar, I am working over a problem, induction heating of a rod moving inside the furnace with a certain velocity, required to relieve stress from the surface. The furnace is stationary, means the...
View ArticleParameterise the position in a text file?
Hello, I want to use the 2D distribution of the relative permeability of a nonlinear calculation in a linear calculation of the same Model with same parameters etc. For that I export the data of the...
View ArticleVelocity point constraint
Hi All, Can we define a velocity constraint at a certain point in a CFD simulation. It can be done for the pressure and there exist some explanations on this issue, but is it possible for the velocity...
View ArticleContinuing Modeling Issues with 2D & 3D piezoelectric SAW model
Hello all, I’m in desperate need of help with my model. The initial model setup is a 2D cross-sectional SAW device where I have silicon, a metallic electrode as my ground, a buffer layer, a...
View ArticleMaterial Parameter References and Subscritpions --- seeking suggestions
Good Day, My work involves a wide variety of materials used in semiconductors and electronic packaging. Perhaps like you I've found references on the web useful but incomplete and scattered. COMSOL...
View ArticleProblem with 3D PDE thin layer mesh
Hi everyone I encountered a problem with meshing a thin layer(~10e-6m) with 3D PDE model. I am not sure how to mesh such thin layer. Has anyone managed to mesh a similar case? Looking forward to your...
View ArticleMicrofluidic Frictional Energy Measurement
Hello, I want to measure the heat generated by frictional energy in Fluid passing through micro channel. Based on my structure it should be around 10 micro Joule. To make the case simple, the heat...
View ArticleIs it real to simulate Full Lightning Impulse 1,2/50 us in Comsol 4.0?
Hi I simulate electric fields in high-voltage switchgear. In my models I use AC/DC Module Electrostatics (es). If the electrode is under high potential, the boundary condition for that electrode will...
View ArticleThermofluidic Modelling of hydrogen absorption in metal hydride bed
For learning purposes, I was trying to do the this project Thermofluidynamic Modelling of hydrogen absorption and desorption in a LaNi4.8Al0.2 Hydride Bed at...
View Articlecomsol solve this kind of moving mesh
hi, i have one doubt about moving mesh (ALE). i want to pass the laser beam on rectangular plate. i want to use mesh density around the laser beam only,not full laser path. so i would like to move beam...
View ArticleCOMSOL License Error -15, 570
Dear COMSOL team, We purchased a 64 bit COMSOL 4.3 verson of software along with a server license. After installing the software on a Linux (Debian 6 Squeeze) based system. We are encountring the...
View ArticleEigenfrequency seems right, but displacement units are totally wrong.
Dear Comsol Community, in the model attached I have a 20 micron long beam using the Solid Mechanics module to get the Eigenfrequencies. I calculated them manually using Euler-Beam theory and the first...
View ArticleEnquiry
Dear all, Please I have these three questions to be answered. 1. Why did the comsol 4.0 did not come with k-omega model which I prefer to k-epsilon model but available in comsol 3.4? Because I believe...
View ArticleGeometry present or not depending on a parameter
Hi! I am trying to create a geometry that will have certain elements appear or disappear depending on a variable. For example: I have a variable "var1" that can take the values of 1 or 2. I have a...
View ArticleEstablishing upper and lower limits for a PDE dependent variable
Hi! I'm solving a PDE system in the physics Coefficient Form PDE and I need to stablish and upper and lower limits for the output values of my dependent variables. Thank you!
View ArticleUsing a step function for a stationary study
I am attempting to model a cyclone using the k-epsilon solver and occasionally get some convergence issues. Would it make sense to use a step function to ramp up the inlet velocity? Can I use a step...
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