How to define the boundary conditions for oscillatory flow in COMSOL?
Hi I want to model an oscillatory flow passing fins inside a resonator. I need to define both of the velocity and pressure boundary conditions at the inlet (x1) and the outlet (x2) of the computational...
View ArticleTime Dependent of intake manifold
Hello, I am having an issue trying to simulate an intake manifold of 4 cylinders. I want to do it as transient flow. But in real life the each cylinder is not open at the same time. How do i tell...
View ArticleStirring tank/Rotating Machinery problem
Dear all, I was trying to add a 3d barrier inside the stirring tank. However, I'm not familiar with the rotating machinery. I don't know how to set up the boundary condition for the new barrier. The...
View ArticleHow to plot a 'variation of Nusselt number vs distance' graph in Comsol ?
Hi everyone, I am trying to plot the 'variation of Nusselt number vs distance' for my project. According to the problem statement, there is a convective flow inside a 2D square , whose sides are...
View ArticleLaminar two phase flow, moving mesh
Hi, I am going to model a vapor bubble that is growing in the liquid inside a 2D channel. liquid has an inlet velocity that drag the bubble downstream and also bubble is growing due to the mass flux of...
View ArticleContact Angle of a sessile droplet
Hi, I'm a beginner in using comsol.I would like to measure the static contact angle of a water droplet. The purpose of this measurement is to determine whether a surface is hydrophobic or not. I've the...
View ArticleWhat physics to use to include Electrothermal flow in the model?
I am working on a non-linear model of a device which deals with fluid flow and electrostatics. I want to include Electrothermal force (ETF) and study its impact on the fluid's velocity in the system....
View ArticlePremixed Combustion with an ignition source
Hello, Has anyone used COMSOL to do premixed combustion for turbulent flow? The reaction I am looking at gives me the Arrhenius forward rate equations and uses an equilibrium condition for the...
View ArticleModelling of a room temperature plasma source
Hi all, I am trying to model a room temp. plasma torch that uses a pulsed DC voltage to generate argon plasma. The goal is to model the electron number density of the plasma for different applied...
View Articleerror when coupling reactive flow and heat transfer
Hello everyone, I am a Comsol beginner and I am trying to model a turbulent reactive flow (homogeneous gasphase reaction). I created a coupled model for the reactive flow and the heat transfer, very...
View ArticleTurbulent pipe flow
Hello, Can i simulate the pipe flow with inlet and outlet pressure boundary condition ? I want pressure drop of 0.05-0.02 bar. I have used pref as 0 Pa. I am simulating a pipe with dimension 6 mm...
View Articledroplet modelling
can anyone tell me the correct procedure for modelling a water drop on wetted surface.... i used 2 phase flow level set and phase field... but its not working.. i jst want to make dat drop on the...
View ArticleMoving Mesh velocity in tpfmm
Hi, I'm wondering how COMSOL calculates the mesh velocity (tpfmm.x_free ) in the tpfmm module, as I define a flux in fluid-fluid interface I want to know it because the velocity is very slow and need...
View ArticleHeat Transfer in Solids-Strain reference temperature problem
I'm trying to rebuild the model Flat Heat Pipe, Application ID: 43841 in application gallery with different geometry. However, in Heat Transfer (in Solids), Solid 1, Model Inputs, the Strain reference...
View Article3D Two phase system by Phase Field model periodic BC fluid mass vanish
Hi everyone, I'm using Phase Field model to simulate two phase flow in pore scale. When the model is bounded by no slip or wetted wall, everything comes out good. However, when I apply Periodic BC on...
View Articlecomputation slows down
I am using the particle tracing module for fluid flow. Every thing is working properly except the time when the particle attraction happens, suddenly the computation slows down and take at least half a...
View ArticleSimulation of effect of heated resistance on temperature distribution in...
I'm new to Comsol and I'm trying to simulate the effect of a metal heater resistance (gold) on a laminar cooling flow (water). I would like to get the stationary temperature distribution in the fluid...
View ArticleTurbulent two phases fill tank
Hello, I'm new on this :D I'm doing the simulation of a break pressure tank, and I want to add the effect of gravity. I am doing it through a turbulent, time-dependent two phases study. I try to add a...
View ArticleMotion due to a magnetic field
Hello everyone, I am pretty new to COMSOL so this might be a simple question to answer. I want to 2D simulate the attraction between a magnet and an iron bead which are located in air (see attachment...
View ArticleMelting Front and Free Surface
Dear all, I'm currently attempting to build a model similar to the "Tin Melting Front" in the model library. This model describes the melting of a metal through the Stefan problem and models the...
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