Compressing Walls and Incompressible Water
Dear All, Could you please kindly help me to solve the singularity problem, occurs in the attached model. This model concerns about a 2D projection of a water container. There are 2 walls, compressing...
View ArticleInterjection Symbol for Heat Transfer in Phase I- Initialization Section
I'm using Heat Transfer Module together with Laminar-Two Phase Flow Level Set. Comsol solves everything related to fluid flow but it doesn't solve problem with Heat Transfer. And when I check "Step I...
View ArticleMixture Model, Turbulent Flow
Hi, I am trying to use Mixture Model, Turbulent Flow to model injection of a stream of lower density liquid to a higher density liquid stream - turbulent flow. I tried to find a taturial in Comsol 5.1...
View ArticleUpdating Boundary condition at each time step
Hi, I am solving a problem using single phase laminar flow. I want to get the velocity field at each time step and calculate the spatial derivative of the velocity, and use that to update the boundary...
View ArticleEcap simulation in COMSOL
Hi! I have to simulate an ecap process with Comsol. The ecap is basically a severe plastic deformation process where a billet is pass trough a die with two channels intersecting at a 90° angle (or...
View ArticlePID Temperature Control
Hey everyone, I am having trouble with PID control of a gas flow. Basically I have a pipe (shown as 2D ax) where air flows through it. A heater at the middle of the pipe (domain 2) heats the air to the...
View Articlecone-jet mode in electrostatic field
Hi, Here is my problem. I want to simulate a electrohydrodynamic (EHD) phenomenone , a nozzle with full water (or electrolyte) in a electrostatic field, the the water is polarized and deformed the...
View ArticleHow to add inertial lift force, dean forces in particle tracing module?
Hi, I'm working on a curved microfluidic channel and trying to use it to separate two particles. However, when I use the particle tracing module, I could not find where to add the interial lift force...
View ArticleFlow over microwell
Hi, I'm trying to create sort of a trap for particles in a microwell. I've achieved a model in which some particles get trapped in the microwell (see attachment), but they all sink to the bottom after...
View ArticleOpen Boundary Condition in Transport of Dilute Species
Hi all, I have a question about the open boundary in Transport of Dilute Species physics. I have a microchannel model with fluid flow going from A to B while the solute going from B to A due to...
View ArticleModelling cavitation
Hi, I'm new to Comsol and try to model hydrodynamic cavitation using the CFD module. Unfortunately, I don't know how to do this. Hydrodynamic cavitation comprises the nucleation, fluid’s vaporization...
View ArticleHow to add inertial lift force and Dean force
Hi everybody, I m doing simulation for inertial focusing. I need to see the effect of inertial lift force and dean force on particle. I m just wanted to know where these forces can be defined. I tried...
View Articlefirst time user need help
Hi guys, this is my first time to use this software (COMSOL Multiphysics ), I am studying a heat transfer in greenhouse on prototype made of acrylic sheets. I just need help if possible to do a 2D...
View Articleacoustic pressure controls airflow simulation
Hi everyone, I have a tough time to simulate airflow is controlled by acoustic pressure, would you want to help me? :) the detail is 1) I have finished simulation about acoustic pressure in a meshed...
View ArticleFree drainage boundary condition
I am very new to COMSOL multiphysics. I need to simulate the free drainage from porous media, which is the conditional based drainage. As far as I know this sort of boundary condition is not predefined...
View ArticleTransport of Diluted Species, incorrect concentrations
Hello everybody, I have been trying to do the Comsol Micromixer tutorial which can be found under the following link:www.comsol.com/model/download/...5621/models.mph.micromixer.pdf I succeeded in...
View Articlerotating machinery + free molecular flow
Does someone know if Comsol can simulate the pressure distribution when rotating impeller on free molecular flow condition? I want to simulate the vacuum pump.
View Articlefree convection heat transfer
Hi I have to model a dynamic simulation for the heat dispersion study of CPU heat sink processes and to optimize the heat tdispersion performance, i have to search for the optimal design ( fin...
View ArticleVibrationg structure in fluid
Hello Everyone, This is my first project with Comsol so I have no clue about what I am doing really. My questions are most likely very simple/stupid I'm sure anyone here can help me. What I want to do...
View ArticleStructured mesh query
Hello How can I mesh my 2-D geometry using a structured mesh? I tried using a mapped mesh but I cannot refine it if I want to. This is important since I have to carry out a mesh refinement study for my...
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