Hagen-Poiseuille Flow
I am having problems getting the same result when I try to model the Hagen poiseuille flow as when I calculate it. For more information on Hagen-Poiseuille...
View ArticleSetting initial values for an iterative solver
Comsol user interface shows some options for setting initial values at the stationary study step at 'Initial values of variables solved for'. These are either zero or a solution - but we want to set...
View ArticleMultiple input ports in RF problems
Hello, I'am doing a simulation with RF module. It's about the mode analysis of a rectangular silicon waveguide. There are two waveguides. To propagate the monochromatic light of 1550nm (1.935e14 Hz ),...
View ArticleDEP Model using Comsol 4.3
Hello, I am trying to do a DEP simulation in Comsol 4.3 and I want to apply an AC signal of 10V 14KHz in a pair of electrodes. I am presently using AC/DC model. I am able to apply a DC signal but I am...
View ArticleBoundary Interaction?
I am currently working on a model that uses the Heat Transfer in Fluids module in the lower domain to simulate the performance of a Metal Hydride that is absorbing heat by a given reaction. The part of...
View ArticleShow which computer is using a license
We have a network license for COMSOL 4.3a. This is a fairly large laboratory setting. People here have a bad habit of leaving COMSOL open on their workstations when they go home for the day, locking up...
View ArticleTwo phase Phase field method
Hi, I am using a phase field method to tract the meniscus formation at the exit of a micron size nozzle and at the same time air is flowing over the meniscus. I am having some problems with the...
View ArticleEFFECTIVE INDEX
Hi eveybody. Actually I am trying to plot effective index of PCF with variation of diameter in COMSOL.I could not know how to put the diameter values and where to put.Please help me in this regard.I am...
View ArticleData export using Matlab Livelink
I have designed a magnetic coil model in COMSOL and successfully imported it in MATLAB. I am plotting norm of magnetic flux in COMSOL Model. Now I want to extract the magnetic flux data in a MATLAB...
View ArticleImport Geometry from MATLAB to COMSOL
Hi, I am new to COMSOL. I have a biological tissue geometry that I got from MRI images into MATLAB. Now I wish to import that geometry from MATLAB into COMSOL to simulate bioheat transfer. I have read...
View ArticleNatural Free Convection
Hello, I'm attempting to model the temperature rise above ambient over the period of one day within a sealed concrete trough buried in soil with its top exposed to outside air. I have successfully...
View ArticleMeaningul drag output
This is a working stationary turbulent flow model. I have created an integral solution set around the boundaries of the object id like to determine lift and drag for. All posts i have read involve...
View ArticleMeshing in matlab
Hi, I am having real difficulty to control my mesh in matlab. Basically I don't have any control over it. Its quite a simple model but im finding that if I change the numbers in the code, I get the...
View ArticleHow prevent an object from penetrating another object?
The attached file has a simple case that is a precursor to what I really need to model. The simple case consists of a membrane (hyperelastic material model) with a small quartz bead located a short...
View ArticleLinking problem when developing GUI with java API
Hello everyone! I am trying to develop a custom GUI in java using COMSOL API. I am following the guidelines in the API Reference, but if I try to paint the result on the GUI, I get a linking exception...
View ArticleUsing interpolation tables for temperature dependent structural and themal...
This will eventually be an analysis of the thermal and structural very steep pulses but for now I am keeping it simple. (stationary and moderate time dependent loads) In trying to defining some basic...
View ArticleHow to stabilize 1D fluid in General Form PDE
I'm trying so solve 1D fluid equations (modeling a plasma): d/dx(n*v)=Sp d/dx(m*n*v^2+n*T)=Sm d/dx(5/2*n*T*v+1/2*m*n*v^3+q)=Sq q=kappa*T^(5/2)*dT/dx Where d/dx is the derivative with respect to the...
View Articlesoftware simulation forming glass
hi, any of you know what is the best software for simulation of forming glass by a bender. thanks.
View Articleparticle motion in a fluid (2D)
Hi, I am attempting a 2D model of the motion of a single particle in a fluid medium inside a microchannel. I am aware that there is a COMSOL tutorial on such a simulation. However, in the tutorial, the...
View Articlereaction is not happening in tubular reactor
Hello guys, I have designed a tubular reactor in comsol 4.2 but after computing it doesn't show any variation. my reaction rate id not changing my conversion is not changing. only axial flow velocity...
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