Pressure Drop in a Muffler
Hello I need to calculate Pressure Drop in a Muffler (3D), i tried to use the Discharging Tank model that uses the Pipe Flow Module, but it seems i can't use a pipe within a pipe (trying to simulate...
View ArticleFluid across cylinder with heat source
Hi! I am doing a small project about an heat exchanger. First I should study the Reynolds number effect and the vortex shedding. I already have some results about that (I should be able to calculate...
View ArticleFree Surface Modeling
Hi all, I'd like to model a sphere dropping into a tank of fluid. Does anyone have any suggestions about how to do this? The main focus is when the sphere hits the fluid, how the free surface reacts...
View ArticleTime Dependent Study- Flow Past a Cylinder
Hello, I am relatively new with COMSOL, and am trying to start off with the basics before I dive into my research using the program... I want to find the Strouhal number from a cylinder in a laminar...
View ArticleMicrofluidics device for sorting of particles
Hi all, I am attempting to do simulations on microsorters based on dielectophoresis and magnetophoresis. I managed to do the simulation for just 1 type of particle but i'm facing issues setting...
View ArticleSqueeze flow: level set with moving mesh
Hello, I am new to the fluid module and am trying to simulate a liquid droplet being pressed between two plates where the plates are larger than the initial droplet (the other problem is much easier to...
View ArticleDifference between Time dependent and Time discrete
Hi, I am working on a conjugate heat transfer problem. By t=20s, the system reaches steady state. Then I would like to see the system response after t=20s, using step function to switch off a source...
View ArticleCFD Immiscible Multiphase - Mixture Model vs. Level Set
I am looking to model water droplets flowing in an oil pipeline, where the water concentration is roughly 5% by volume. The flow will be turbulent. The objective of the model will be to measure...
View Articlehow to define three different particles?
Hi all, Am simulating a micro-sorter to sort the blood cells. I have used Particle Tracing for Fluid Flow to define my cell. I wanted to define three sizes of cells, so as to analyse how they flow and...
View ArticleDerivative of Normal on a Surface
Hello. Any help would be greatly appreciated. I am trying to calculate the mean curvature on a boundary. To do this, I am trying to calculate the dot product of the surface gradient operator and the...
View ArticleHow to Couple Free and Porous Media Flow with Heat Transfer In Solids
Hi Everyone, I am new to COMSOL and I am trying to simulate a solar panel cooling system. I am trying to simulate in 2D the heat transfer between a thin rectangular layer (the photovoltaic cell),...
View ArticleConvergence issues with level-set conservative form
Hello Everyone, I am trying level-set conservative form for droplet generation in flow focusing device. I have tried the following: (a) non-conservative form: it converges well but mass conservation is...
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 Articlerigid particle carried by a channel flow
Hi I have to simulate the displacement and rotation of a rigid prticule in a fluid flow and I am not a professional on comsol. So, is there anyone who could help me? or if you have any examples of this...
View ArticleMass in not conserved even in conservative form, multiphase flow of water...
Hello everybody, I have previously posted on a problem I was trying to simulate about multiphase flows (Multiphase Flow LS - Air Bubble in Water Cylinder - Conservative forms fails) and I have tried...
View ArticleMesh problem
Dear all, I have got he problem during mesh, showing as Failed to generate mesh for domain; and Internal error bounday respecing. Can somebody help me to do this since I have checked and tried my model...
View ArticleResult of the solution not equivalent to the initial boundary setting
Dear Sir Magnus Ringh, A pleasant day to you Sir. I would like to consult this problem that I'm having at the moment thinking that you can help me with this matter. Presently, I am doing a 3D...
View ArticleVanadium Redox Flow Battery, Model ID: 14153, negative Concentrations
Dear COMSOL Community, I have a question regarding negative Concentrations in the example Vanadium Redox Flow Battery, Model ID: 14153 that is posted in the model gallery....
View ArticleProblems with the results initial value of the solution is not equal to the...
Dear Jean-Francois Hiller, A pleasant day to you Sir. I am currently doing a heat and mass transfer study to simulate the drying of rice grains. My geometry is composed of 186 pieces of ellipsoid...
View Articlewhy it is different between Axial 2D and 3D in Non-Newtonian Flow.
Hellow, i have used this for about 2 weeks. but i have some problems. so i need some help. i drawn a model of the cylinder which is same both them. and they are same values, boudary conditions... but...
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