Errors with conjugate heat transfer...
Hello I am new to COMSOL and I am doing simple test model of natural convection of air around hot metal cylinder. I think, that I set everything properly (like volume force etc), physics is quite easy...
View ArticlePressure change with time
Hi everyone, I have a problem like this: Two big container are linked with a thin tube, there is a valve at the middle of the tube. At time t<0, The containers are filled with air but at different...
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 ArticleElectrowetting / droplet motion
Hi, I want to determine the physics of motion of droplets (transport, splitting and merging) using COMSOL. I found the paper: www.comsol.co.in/paper/download/37206/Cahill.pdf but I can't implement the...
View Articleelectrospray modeling
Hi iam trying to simulate electro- spray , if you any experience and in that please help me. thanks
View Articleanimation vieweing from different reference frame
Hi. I have used 2d spf cfd flow simulation. I have solved and found velocity of a moving wall BC. Is it possible to change this body-fitted movies/animations to view through other frame? I mean I...
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 ArticleWater/oil not mixing, COMSOL version 4.3b
Hello, I am using Comsol 4.3b and I am trying to set up a model to see the effect of mixing of two different liquids (consider water and oil). I have created two rectangles (domains1 and domain2) on...
View ArticleI want to get surface wave.
Hi there. Thank you for reading my discussion. I try to build suface wave. I make a rectangular at first and apply a open boundary condition at the top of rectangular , then I use...
View Articlemodelling two phase device
Hii, I have problem modelling a device. The device basically consists of two inlets and two outlet, in which one inlet is for the air, and the other one is for water, and the same is for the outlet....
View Articleconvective heat transfer on a sphere
Hey guys, I'm writing a simulation of freeze drying for my bachelor thesis. In my bachelor-thesis, i’m looking at a system with a particle of pure ice (T=230 K), which is exposed to a ingoing water...
View ArticleRotordynamics, eigenvalues and frequency domain
Hi everybody, I have two questions about rotordynamics modelling. First of all, I'm modelling a rotor using a parametric sweep on angular velocity to find its eigenvalues. After that I would like to...
View ArticleHi Eric
I have read your thread on rigid particle carried by a channel flow. It is pretty impressive. I'm trying to model the flow of proppants, and I'm very interested in your model. You offered to send you...
View Articlesimulating bubble generation in water using T-junction
hi , I'm trying to simulate air bubble generation in water flow using T-junction . I sketched a 3D model in microfluidic module using level set laminar two phase flow . the problem is I have used...
View ArticleHelp Needed - Lift and Drag for a Flat Plate, Normal to Flow
I am trying to determine the lift and drag coefficients for a 2-D flat plat ( 0.1 m chord x 0.0166667 m height ) oriented perpendicular to an air flow with Re of 10^4 using the Spallart-Almaras...
View ArticleHow to solve the problem of negative concentration
I am a totally new user on comsol. Now I try to simulate the mixing in the microchannel without reactions. I use the laminar flow and Transport of dilluted species. There is a similar example from...
View ArticleHow do I model two different fluids in one domain?
Hi, I am new to COMSOL, and am trying to model a microfluidic device that has two fluids, each with a different conductivity. I tried building a geometry with two domains that are a union with an...
View ArticleLinking a Porous Media Flow to a Transport of Concentrated Species
Hello, I have created a chamber that has sugar water running through a compartment and carbon cloth modeled by a free and porous media flow physics. I also want to create a transport of a concentrated...
View Articlesame Problem
Hi Melvin, I have the same problem. i am trying to simulate air/ water interaction. The device has two inlet, and one output. each fluid should enter in one inlet. Please if you find an answer to your...
View ArticleI have question about Particle tracing in laminar flow and adding DEP force
Hi, I use partible tracing module and want to add DEP force. I did, can't activate. How can I do this? please help me. Thanks,
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