Hagen–Poiseuille flow
I would like to use Comsol for a microfluidics project I'm working on. As this is my first time working with Comsol I am trying to simulate a simple problem to compare the simulation with analytical...
View ArticleError: Parameter lists gives empty sweep
Hello, I would like to know the reasoning behind this error in return of a monotonously incresing series of frequencies. Examples: a) 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 90,...
View ArticleProperties of magnetic flux in some transformer sheets
Hello everyone, i´m trying to observe the magnetic flux density in a smal gap of some transformer sheets. So far building the model and getting results that are in consent with my experimental setup...
View ArticleAutomatic 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 ArticleHow to determine face numbers (using matlab livelink) associated with an object
Hello again, I am trying to 'automatically' set my boundary conditions for a model generated in matlab with livelink. I know which objects need to have which boundary conditions based on a draw order...
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 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 ArticleParticles traveling through boundaries
Hello All, I am attempting to use the particle tracing function on a laminar flow in a small channel with obstructions in the channel. I modeled the design after the lunchtime seminar on the particle...
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 Article"Hinge assembly" problem
While going through the solved model 'hinge assembly' given in the COMSOL, I came across some difficulties. Actually, I have to develop a solid model involving hinge joint similar to what is provided...
View ArticleHow to assign a defined function to an electrode????
Hello Friends, Am working on AC/DC Module and new to comsol. Am trying to define a rectangular pulse of 1200v with a duration of 1ns to an electrode and i wish your kind assistance for the same. Thanks...
View ArticleWhich Lithium on battery is used in Lithium ion isothermal 1D comsol model
Who is the manufacturer? which model ? anyboby knows?
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...
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