How to model laminar and turbulent flows separated by a porous medium?
I am trying to simulate a problem involving fluid flow in 2 channels separated by a porous medium. The 2D geometry consists of 3 flat domains on top of each other. The one in the middle is a porous...
View ArticleCOMSOL for CO2 flooding for EOR
Did anybody do a model to simulate EOR by CO2 injection? Using compositional model. tks
View ArticleFluid Flow in a Tube around a radially growing/shrinking cylinder
Good Morning, I guess I have a rather simple problem, but am not sure wether or not I am able to implement it at all and how exactly to do it. So I present you the problem and my solution afterwards. I...
View ArticleMirror/duplicate data after using a symmetry plane
Hello everyone, I have a question concerning symmetry planes. I want to model a static mixer and a surrounding cooling structure. I want to simulate the flow through the mixer first, and then model the...
View ArticleNon-newtonian Flow
I am simulating a chute flow. My geometry is a rectangular box. There is an inlet and outlet and other walls are fixed. In inlet I am giving velocity inlet conditions and at the outlet I am giving...
View ArticleCollision of a droplet and a solid particle
I want to model collision of a particle into a droplet. A water droplet is falling by gravity and a solid particle is shot toward that to hit the drop. Collision outcome is a conic liquid film...
View ArticleFailed to find consistent initial values, Dense suspension simulation
Hi, Im new to comsol and i want to simulate shear induced migration of particles in a suspension at low reynolds number. I tried to implement it in the mixture model laminar flow but the model had some...
View ArticleClik here to view.
1D axisymmetric equation based modelling basics
I am pretty new to comsol. I need to model a 1d axisymmetric problem of fluid flow at the moment and develop the model further. I cant find the fluid flow physics for 1D. so i decided to try equation...
View ArticleZero flux boundary conditions issue with Poisson equation
Good morning, I am using version 4.3b. One of the steps in my project requires me to solve a Poisson equation with zero flux conditions at the boundaries. My geometry is a simple 2-by-2 square (domain:...
View ArticleConstant eps
Greetings, What does constant eps do when it is added to the source term (f) of a PDE? Does it help convergence? Thanks. Eric
View Articlebuoyancy and convection - 3D simulation does not converge
Hi! Dear all, I am now attempting to simulate the flow nearby the surfaces of an aluminum wedge, which immersed in stable thermal stratified fluid(water). Due to the metallic wedge's high conductivity,...
View ArticleClik here to view.
Singuarity error and mesh size
Hi I have a pde based model where It is a 1d problem which simplifies it to an extent. when I try to run it at coarser mesh sizes I get an error saying may have reached a singularity. When the mesh I...
View ArticleSimulation of evaporation of water drop
A water drop is resting on a solid substrate and evaporating continuously. I want to stimulate this to know the fluid flow inside the drop while evaporating. I am a beginner. Please help me.
View ArticleInput and output flow mismatch
Hello, how are you doing? I´m simulating a simple flow system channel with an input and three outputs. When i compute the input flow trough a boundary integration at each one of the input and outputs i...
View Articleion concentration/concentration gradient
Hello I am working in the PDE model and I have a 1D geometry consisting of 2 intervals. by flowing current through the system, I would like to show that one interval represents an ion selective zone...
View ArticleBrownian motion
I try to simulate the Brownian movement of particles from one part of a domain to the second one in 2D. The parts are separated by the wall with a small opening of the size of 1 micrometre. Why Comsol...
View ArticleA problem with a boundary condition which changing with time.
Hi, I have a problem with a boundary condition which changing with time. I made some simulation of a porous media flow, and one of boundaries should be defined as Pressure changing with time, for...
View ArticleGeneral questions about particle tracing for fluid flow
Hi all, I am grateful for your help if you can answer to my questions. I read in the particle tracing doc that the system should be a dilute or dispersed flow and this means that I should calculate the...
View ArticleResidence time distribution via Heat transfer in fluids
Hello everyone, I want to calculate the residence time distribution of a static mixer. More specifically, I want to replicate an experiment where dye is injected into the fluid stream. I suppose the...
View ArticleAir removal from chamber.
Dear all, I'm trying to create a simple model where a vacuum pump is attached to an otherwise sealed volume. This is "rough vacuum", so just <1000 mbar below atmospheric pressure. So, ideally, I...
View Article