(Two phase)Bubble shrink in a two phase flow
I want to simulate a bubble dynamics in the water. I initialize a bubble in the water, and use phase-field model. I give the water a velocity in a channel, the bubble moves with the water. After a few...
View ArticleGas stratification model
Hi everyone, I recently started using COMSOL, and I am having a lot of problems with a model that, in theory, should be extremely easy. I need to model the stratification of a mixture of oxygen and...
View ArticleHeat Flow in simple pipe with water
Hello, I'm really new to heat flow computation and I have no Idea how to calculate time and distance of water flowing in pipe when water temperature will stay constans. Model: pipe 50 m long, 0.04mm...
View ArticleWater hamme problem solving - need help
Hi, I am trying to simulate water hammer phenomena to validate the published results for a straight piping system. The piping system is connected to a contact head reservoir at one side and there is...
View ArticleCentrifugal Force
Hi, I would like to include centrifugal force in my COMSOL (version 4.3a) model of a curved channel with laminar flow containing small particles. Is it necessary for COMSOL to find the first and second...
View ArticleError-Automatic remeshing
Hi, I encountered a problem about "Automatic remeshing" with "deformed geomerty" and Time-Dependent Solver When I ran the program, Comsol always displayed a Error: Unsupported operation on this type of...
View ArticleNo change in laminar flow simulation results even after changing material...
Hi, I have been doing very straight-forward and simple laminar flow simulations in a chamber. I have observed that flow simulation results don't change if I add and use another fluid with different...
View ArticleOpen Boundary
Hi everyone, I have a model with two domains one of which is laminar flow and another is porous media domain (Darcy's law). The fluid stream percolates from the laminar flow domain into the Darcy law...
View ArticleUnrealistic Particle Behavior
Hi, I am simulating a 2-D Model, where I want to analyze the convection effect of a heater which is heating up the air above. I want to see the effect of particles, that are distributed in the air. I...
View ArticleRising bubble
Hello comsol community members, I'm trying to simulate a rising air bubble in water. I found the rising oil bubble application in the application library and tried to adjust it to use air instead of...
View ArticleHow to continue particle tracing from a certain time point?
Dear all, I am now working on the simulation of particle tracing with fluid flow. I have finished the staionary fluid flow and time dependent particle tracing calculation and obtain the particle...
View ArticleError: "Attempt to evaluate negative power of zero."
I'm building a model using the Reaching Flow in Porous Media in a 2D axis-symmetric component, and my goal is to remove some of the dilute species from the system as a function of concentration and...
View ArticleSpiral vortex
Hi, This is Montassar Sharif, I'd like to simulate spiral vortex. I have seen two or three examples but they are not what I need. The vortex in those examples ismoving in need to simulate some thing...
View ArticleContinuity Boundary in ALE + Fluid Flow + EC
Dear Comsolers ; I am modeling a transient discharge through a flowing fluid in a nozzle. one of the electrode is moving so i created a sliding moving mesh for the movement by creating an assembly...
View ArticleCounting particles by inlet; Particle tracing in laminar flow
Hello Comsol community! I'm simulating a simple 4-way intersection using the laminar flow module. Two streets are inflows and two are outflows. Thereafter I'm adding particles to each input flow with...
View ArticleGas velocity profile in laminar flow model
Hi, I am simulating gas velocity and tempeature profile in a tube using laminar flow model. But I have some problems: 1. In "Heat flux" text field, "[1/cm]", why "cm" is devided by 1, rather than "cm"...
View ArticleLiquid-Vapor interface drops very fast
Hi I have encountered a problem in COMSOL when using the “laminar two-phase flow, moving mesh” physic. A simple model indicating what I am trying to solve is provided in the attachment. As you can see...
View ArticleFluid mixing in micro mixer
Hi, I am working on a project and in one part I have use Comsol. This is the first time I am using Comsol and badly need some guidance. I am working with a micro mixer where I have mix two fluids. In...
View ArticleInitial Pressure - error
Hi everyone, I try to model the influence of a heated boundary on surrounding air in a 3-d model. When I try to set the initial pressure in the laminar flow to: -spf.rho*g_const*(0.05[m]-z) I always...
View ArticleTime-Dependent initial solution violates specified initial conditions
I am trying to build a dye-washout model (using Reacting Flow in Porous Media physics to predict the time-dependent concentration of a dilute species). I'm able to run simulations for varying lengths...
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