How to rename / view /specify specific boundaries in the geometry.
Dear sir, I have a trouble locating specified boundary in the geometry. I am new to learn COMSOL. I follow up tutorials that asks me to define certain conditions at certain boundaries. I depend on...
View Articlehighly conductive layer
Hi, I tried to do a simple transient heat transfer model as follows: one model with a thin solid domain on top of a thick domain and another model with highly conductive layer on thick domain. The...
View Articlemomentum transport and mass transports coupled simulation using matlab script
Hello All~ I conduct momentum transport and mass transports coupled simulation using matlab script~ but i have some problems~ when i simulated this topic, always failed to find a solutions~...
View ArticleNumber of degrees of freedom solved for: 0.
Hello all, When I try to use 4.0, I met with this problem when solving. Does anyone know how to fix this? I think it might be that I did not add the mesh to the solver, which is different from 3.5a....
View ArticleHeat Pipe on a Heatsink
I watched the tutorial for Heatsink Analysis. I was wondering if we can develop the model by adding a heat pipe. I was told that it needs to be developed as a porous region but how the -thermodynamic...
View ArticleWater droplet falling through air on a structured surface
Hi, Im new to comsol. I was trying to model a water droplet falling onto a solid substrate. The droplet should fall through air and then i should be able to calculate contact angles at various...
View ArticleProblem: Oil Droplets Seem To Dissolve In Water (Two-Phase Flow, Level Set)
I have a problem with my "Two-Phase Flow, Level Set" simulation in COMSOL 4.2. I am trying to simulate the formation of oil droplets in water by hydrodynamic flow focusing. The water and oil are...
View ArticleConvergence problem of contact mechanics
Hello, Following the earlier discussions on implementing an algebraic equation into a structural mechanics model, I fortunately got away with writing out explicitly an analytical solution. Thanks a lot...
View ArticlePDE - Contact Resistance
Hi Everyone, I am wondering how to implement electrical or thermal contact resistance when using the PDE physics. I am using the PDE coefficient form to model thermoelectric effects at a...
View ArticleCOMSOL Releases COMSOL Multiphysics version 4.3a
We at COMSOL are proud to introduce version 4.3a of COMSOL Multiphysics to the COMSOL community See: http://www.comsol.com/products/4.3a/ This introduces: * LiveLink™ for Excel® * LiveLink™ for Solid...
View ArticleHow to fix the error "Out of memory in stationary solver."
hi ! I'm Lam, I construct a model.when i play function 'compute' in STUDY and see error "Out of memory in stationary solver." please show me how to fix it. thank you for comment.
View ArticleFrequency Domain Study
Hi, I'm starting to use Comsol and I'm trying to do a frequency domain study on a poroelastic material subject to a sinusoidal load which frequency is in the range 1 to 100 Hz. My problem is that I...
View ArticleFilling an "empty" space
Hello, I'm new to Comsol and a novice at SW2012 It seems in order to model fluid flow through a heat exchanger, the volume filled with fluid (helium in this case) must be included in the model as a...
View ArticleNo eigenpair solution selected
I am getting this error message - "No eigenpair solution selected " when I hit compute. Can someone please help me solve it. Thanks, Rohan
View Articleerror in stationary solver
I am modeling 3d capacitive accelometer , during simulation process i am getting the error :"out of memory in stationary solver". kindly can any one help me out .
View ArticleNon-isothermal flow Vs conjugated Heat transfer
Hello all My problem is like flow through a pipe surrounded by a sold domain. Outside the pipe there is a small domain(inside the solid domain) maintained at constant temperature of -10 deg C and water...
View ArticleHow to Draw a Bowtie antenna in Comsol 4.3a
Dear all, I want to know how to draw a bowtie antenna in comsol 4.0 or above. I tried to draw a polygon and then extrude it, But it do'nt work. In other words, I want to draw a triangluar prism in...
View ArticleWhy does my parametric sweep slow down?
When doing nested parametric sweeps, they start off fast but slow down to a crawl eventually. What am I doing wrong here? Is there a faster way of doing this? Seems it has little to do with my computer...
View ArticleStirling Engine
Hi, I am trying to simulate a stirling engine cycle and my goal is to plot its pressure and volume diagram and possibly its temperature and entropy diagram. I've explored the website and saw this paper...
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