How 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 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 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 ArticleDeformation of liquid droplet
I am new to COMSOL, so I am referencing a work on deformation of liquid droplet impacting a solid surface. I tried to recreate the same model as that work. But I ran into several problems. As I tracked...
View ArticleCan someone help me understand this error?
I need help understanding the cause of the following error: "Failed to compute elastoplastic strain variables" I have received this error numerous times in a few different structural models where I am...
View ArticleCluster computing got stuck :external progress scheduling
Hi,Ihave recently setup a cluster and i had comsol 4.3 on the head node,and i had the installation forder shared, model working directory shared. However,when I am trying to submit a batch job,using...
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...
View ArticleError in solver
hi, I am modelling a 3d accelerometer in 4.2a version, during simulation i m getting an error like "out of memory during LU factorization" , could anyone pls tel me why i am gettin dis error..
View ArticleSome comments on pA material absolute pressure and CFD gauge & reference...
For those interested in pressure definitions As I read often comments on the Forum, and I heard many questions on the last workshop at the Milan conference on CFD pressure, gauge, absolute, reference...
View ArticleDC magnetic state of ferrite
Hi!! could anyone please guide me about how to find the DC magnetic state of ferrite in Comsol's RF module.sorry for a vague question but i am pretty new to COMSOL as well as electromagnetics domain so...
View ArticleIs it possible to create a "memory" of a varible?
Hi, I want to be able to define a stress point in space that comsol should remember until a certain condition and then it should change to a new stress point memory. It is a time dependent problem....
View ArticleCALCULATE HEAT PRODUCED AFTER HAVING RESULTS
Hello, I have a plate that vibrates and I have friction in one point.In my results I can see the stress in this point,the strain,displacement,frictional force,sliding velocity .I want to calculate the...
View ArticleThermoelectric Effect
Hello, I'm working on Thermoelectric Generator and I would like to have a basic model with the equations used in COMSOL, Could anyone who worked in this field, please help. With Regards . Pheba
View ArticleStabilization methods
Hello, How does using stabilization methods like streamline diffusion, cross wind or isotropic diffusion affect my solution.To elaborate, I am solving navier stokes and convection diffusion problem in...
View Articlepiezo energy harvestor with open circuit voltage to closed circuit voltage?
hello freinds, i construct a piezoelectic energy harvestor in comsol 4.2. this model can give us induced open circuit voltage based on applied force of some frequency.but open circuit voltage is hardly...
View ArticleTransport of concentrated species - will the species change the flow field ?
Dear everyone, I am working on one simulation about membrane separation, and I am using "Laminar Flow" together with "Transport of concentrated species". I have one question, will the flux (gas A)...
View ArticleNot convergent when the mesh is dense, why?
Dear all, Convergence problem is kinda mysterious... This time convergence is nor reached when the mesh is dense. I would say perhaps too dense in some region. Some coarser mesh leads to convergence....
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