multiphase flow in microchannels
Hi Everyone, I am working on multiphase flow analysis in T- shaped micro channels. The active fluids used in the analysis were air and water. I didn't find any tutorial explain this. can someone help...
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 ArticleMIcro-mixing of two different fluids
Hello, In micro-fluid domain, fluids (which don't react with each other) may mix only by diffusion. So if I have two different fluids, having different inlets and a common outlet (lets assume a T-...
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...
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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,...
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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 ArticleConvergence problem in time dependent solver
Hi, I'm getting this error when running a time dependent simulation of laminar flow in a micro channel. What I want to do is change the input flow on one arm of a y-channel and follow the response in...
View ArticleIntegral of pressure constraint in dense suspension tutorial
Hi, I'm trying to figure out the meaning of the weak constraint on the integral of the pressure in the tutorial Two-phase modeling of a dense suspension. Mainly, a total force is defined via Fp_tot =...
View ArticleDefine a Mixed (cauthy) boundary condition for Richards Equation(subsurface...
I read some paper, in the old version of COMSOL, we can choose a Mixed boundary condition (mix of Dirichlet, Newman and Cauchy conditions). in order to automatically transfer the boundary condition...
View Articlerigid particle carried by a channel flow
Hi I have to simulate the displacement and rotation of a rigid prticule in a fluid flow and I am not a professional on comsol. So, is there anyone who could help me? or if you have any examples of this...
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