Permeability and Solute Transport in Free and Porous Media
Hi all, I am trying to model a device that consists of the following: Top layer: a flowing fluid-filled channel containing solute/molecules of a certain size. Middle layer: a permeable membrane Bottom...
View ArticleStreamlines and animation for fluid flow
Hi, I’m using COMSOL in order to simulate interstitial water velocities in an embankment dam. I’m inducing an upstream water level as well as a downstream one. My questions are the following: 1) I want...
View ArticleIntegrating several Physics and problem with average current distribution
Hi there, I am trying to solve nernst plank equation in 2D space. I have inert electrodes. I used 2 methods for approaching and both have a common problem - the mesh (copper deposition) does not move...
View ArticleAbout the stokes drag on a sphere (mph attached)
Dear All, I am trying to find the drag coefficient of a sphere in a stokes flow. Since this 3D problem can be simplified into a 2D problem, I use the creeping flow module in 2D to simulate this case....
View ArticleBrinkman equation in modeling blood flow in biological tissue
Hello, I am modeling interstitial blood flow in the tumour tissue surrounded by the normal tissue, which are both assumed to be porous media. So I use Brinkman equation, which consists of momentum and...
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 ArticleError in sweep. The following feature has encountered a problem:
Hello, This is a problem i am encountering in trying to rum my simulation with COMSOL 5.1. I can't seem to get past here. Attached herewith is my .mph comsol file, you just need to run it and see the...
View ArticleSimple Non-Isothermal Pipe Flow Loop - Singular Matrix Error
Hello friends, I am a new COMSOL user, and I have a problem with a simple model. I am modeling a pipe in a steady state, closed loop. It is a 20cm diameter pipe with water flowing at 1 m/s forced by a...
View ArticleWays to model concentration depletion
I'm currently working on a model that determines a concentration after diffusion of a liquid. I have to now add another bit to it that shows a portion of that fluid being filtered out and show the new...
View ArticleFailed to find the consistent initial values
Dear sir, I am getting an error after solving as follows"Failed to find the consistent initial values Last time step is not converged. - Feature : Time - Dependent Solver1 (sol1/t1) - Error : Failed to...
View Articlehow to use two boundary conditions at same boundary
I have been solving darcy's module in which i am supposed to add BCS of inlet pressure as well as mass flux which is at same boundary. But when i add 1 boundary condition it gets overridden by another...
View ArticleBrinkman boundary stress condition at inlet and outlet of porous pipe
I am trying to simulate flow through porous pipe, for which i have selected Brinkman equation. This porous pipe is nothing but a honycomb which has small tubes with hydraulic diameter of ~1.5 mm &...
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 Article2 inlet in single pipe with 2 different material
I am designing a reactor in which i want to have 2 different material from 2 different inlet but in the same reactor. As shown in the attached figure both the materials mix at the T junction and exit...
View ArticleDiffusion in Laminar vs Turbulent flows
I am modeling a falling film which absorbs a gas. I am interested in how the solute travels normal to the flow. The Laminar flow is a simple solution. However, I am investigating conditions which will...
View Articlelid-driven cavity flow problem
I am trying to solve the classical lid-driven cavity flow problem by Comsol, using Laminar module. However ,the moving wall condition is new to me, i just set the upper wall velocity at 1m/s, but can...
View ArticleThe deformation of gel layer
I am a new user of Comsol. My problem is that infinite gel layer lays on a rigid substrate subject to an applied weight. The purpose of study is to study the deformation of gel in X3 direction. I hope...
View ArticleSolid and Fluid motion with eigenfrequency study
Hello, I made a very simple geometry in 2D, such as the cross-section of a microcapillary. I want to find some eigenfrequency which can make a few modes on a microcapillary. So, for the shell I used...
View ArticleVisualizing the particle trajectories- in particle tracing for fluid model
Hi, My fluid flow model and particle tracing module work fine. BUT problem in post-processing is: I released 4 particles (using massless formulation) in 3D model, from -5[cm] relative to the surface...
View ArticleTransparency
Hi guys, I started the conversion from v3.5a to 4.1 and in doing that I went through the busbar example. I have an annoying problem though. I can't switch on the transparency to see through the air...
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