Element Death (In Fluid Flow)
I have seen element death implemented by lowering Young's Modulus but I don't think that would work for me. I have a layer of material, which represents a powder. A laser beam (modeled as a volumetric...
View ArticleControl of dissolved species flow through the interface in two-phase flow
Hi! I am modeling flowing droplets of oil in water in a microchannel (w=100um) with Laminar Two Phase Flow Level Set, and Transport of Diluted Species. In the aqueous phase (phils=0) I have one...
View Articletrublent flow with solidification
Hello all.. I am solving a turblent flow coupled with heat transfer and solidification. In the model library to model the same problem for continuous casting,, laminar flow is used. I am including the...
View ArticleSolving for a specific Pressure or Force in COMSOL?
Hello, I am fairly new to COMSOL and I am trying to simulate two different things: 1. Injection of a liquid through a small tube that connects to a larger tube with a wire inside. 2. Injection of air...
View ArticleTwo phase or three phase flow
I've to use water and oil to create droplet and air to divert the droplet to different channel. I need to know whether it is possible to use three materials(water,oil and air)in two phase flow,level...
View ArticleDarcy's Law + Heat transfer in porous media
Dear friends, I'm trying to model the heat and mass transfer in a porous media with the help of the physics ,,darcy's law'' and ,,heat transfer in porous media'', but I keep getting the error ,,failed...
View ArticleTurbulent flow in 3D
Hi, Anybody can help me regarding the value input in turbulent flow analysis to obtain the result
View Articleparticle count
Hi, I am currently working on Laminar Static mixers on COMSOL 5.0. I have gone through the given Particle Tracer in Laminar static mixer webinar on COMSOL website. I have slightly modified the given...
View ArticleInitialize level-set interface during simulation?
I am trying to model a single line scan of a laser over a bed of powdered metal. So far I have the heat transfer down. I would like to model the formation of the metal bead and the heat transfer all in...
View ArticleVolume fraction
In my project I'm creating droplet with water and oil ,Then I need to push the droplet from main chaneel to sub channel. For that I'm using air to direct the droplet into the sub channel or output. I'm...
View ArticleHelix with a non-circular cross-section
Hi all, I'm working with designing spiral microfluidics channels that radiate outwards, with the Radius Of Curvature changing over time, ideally every 180 degree turn of the channel or maybe with a...
View ArticleModeling evaporation of water. Need boundary condition to vary in space.
I am trying to build a 2D model of air flowing over a thin film of water. In this model there is a constant heat flux on the bottom boundary of the thin water domain. The goal is to track how much...
View Articlesingular electric field
Hi all Im facing a singularity issue as Im calculating magnetic field of conduction current inside a microchannel flow. The reason I get a locally high magnetic field even if the corners are rounded is...
View ArticleThe PDF guide of Permeability Estimation Application ID: 33331
I would like to do the simulation like Permeability Estimation Application ID: 33331 from the example cases, but there is not the PDF guide in the attacment online. Could anyone help me to guide how to...
View ArticleUnable to evaluate an expression
Excuse me, I am getting an error as Attempt to evaluate real square root of negative number. Function: sqrt Failed to evaluate expression. Expression:...
View ArticleSurface to Surface Radiation Heat Transfer coupled with Electric Currents Module
I am trying to model heat generated from a coil within a volume of air. Currently, I am getting an error saying that I have faulty initial conditions. The coil has 10.6V running through it, which...
View Articlehow to get the graph of permeability in the example "Permeability Estimation...
In the ppt it said that "The permeability can be found under the Results->Derived Values node." How can I get the graph of the permeability vers different rate of fiber.
View ArticleThree phase flow problem
My work is to create a chanel design to sort the droplets,for this I'm using water and oil to create droplet and air to sort the droplet to the other channel. I need to control (open) my inlet at...
View ArticleFluid Flow and Heat Transfer in Fluid/Solid - problems with convergence
Hello everyone! I am quite new to COMSOL and I am currently working on the 3D geometry I hereby attach. The geometry is built in COMSOL Multiphysics 5.0. The model is referring to a 23 meters high...
View ArticleBoundary condition setting problem for electrode
Hi! I am using transport of diluted species to simulate particle movement in discharge but have some problems with the boundary condition setting for the electrode: the electron move towards the...
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