rigid 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 ArticleFinite Elements for Fluids P1+P1 P2+P1
Dear Comsol users, Comsol sets P1+P1 elements as default for laminar flow described by Navier-Stokes equations. As far as I know, theoretically, these elements are not good for such equations. Instead,...
View ArticleSimulation of Stirling Engine
Hello everybody I'm currently trying to simulate the fluid flow in a stirling engine (beta) which I've built from the following video:www.youtube.com/watch?v=X2qssmxA82U You should try building it;-)...
View ArticleMultiphase Flow LS - Air Bubble in Water Cylinder - Conservative forms fails
Hello everybody and thank you in advance for any kind of help you may give, I am trying to simulate a simple kind of scenario, an air bubble in a water cylinder rising due to buoyancy force. I made my...
View ArticleDensity dependent on temperature and solute concentration
Hello, I am trying to couple fluid flow (Darcy's Law), temperature (Heat Transfer in Porous Media), and solute transport (Species Transport in Porous Media). I need the density of water to be dependent...
View Article3D simulations and meshing problems
Hello, I am doing some 3D simulations. I have basically some very small structures on a bigger substrate. I have to use the ignore faces operation to remove the common faces between the substrate and...
View ArticleAny sucessful study for fire simulation by comsol?
Hello! Is the comsol suitable for fire simulation? Another question is any sucessful case for high temperature (100c - 900c)environment air flow simulation with inlet and outlet condition. Since When I...
View Articlehow can set up the inital field velocity for the fluid?
Hello I want to simulate the motion of a nano ball in the liquid. the liquid has a stale field velocity, angular velocity W(r) and has nothing with the angle theta due to symmetry. I would how to set...
View ArticleDe-icing of wing
Hi, I'm doing simulation of deicing of wing due to heating up sections of the leading edge of the wing. However, when I go through all the boundary set up and run the solution. I get an error:...
View ArticleFind Inertial Modes, Eigenvalues for a Sphere of Fluid
I am new to Comsol and I am trying to find the eigenmodes of a rotating sphere filled with water in the rotating frame. I have specified the sphere filled with water with free slip walls, specified...
View ArticleApplying AC voltage
Hi all, I'm currently studying the electromechanical effects of a water droplet under AC/DC voltages. The water droplet is placed between two rectangular electrodes. I've applied a electric potential...
View ArticleHow do materials properties are considered in k-epsilon turbulent model?
Hi everyone, I have a doubt about how material properties are considered in k-epsilon turbulent models. I'm simulating air flow around buildings and I specified materials for the ground and the...
View ArticleHelp for my case!
Hi, I am new to Comsol, and I want to simulate a water droplet falling down and pass through the 2mm gap between two circle particles. (see attached file) the important thing is that I have to consider...
View ArticleBrinkman Equation; Anisotropic Permeability
Can I specify an anisotropic permeability with COMSOL 4.3a; Subsurface Flow Module; Brinkman Equation? When I go to user defined, I can assign a single value only. I can't enter a tensor or specify...
View Article2D Poiseuille flow, wrong solutions?
Hello all COMSOL users! I was solving a simple 2D Poiseuille flow problem on a rectangle domain. I use the "creeping flow" physical model with the "incompressible" option. And I just set the boundary...
View ArticlePlease help
Dear Sir, I am Rahul Prakash, a final year undergraduate in Chemical Engg Dept, Indian Institute of Technology, Bombay. As a part of my final year project, I'm trying to simulate the two-way...
View ArticleLiquid Encapsulated Capacitor
I think I should first start with "I am extremely new to COMSOL" :) That being said, I started working with it a little and now I can finally design a capacitor and have COMSOL calculate the...
View ArticleInitial negative concentrations
HI All, I am trying to simulate a A+B-->C chemical reaction. I dont know why my reactants (A and B) concentration is going negative. How do I fix this? I have attached my model as well as pic of the...
View ArticleConcentration problem within micromixers: absurd concentrations, no mass...
Hello everybody. I am modelling micromixers and want to check their efficiencies. For that purpose, I first used the Incompressible Navier-Stokes model, to calculate the flow inside my device. I set it...
View ArticleFree and porous media flow 3D simulation - convergence issues
hey all, I was using the free and porous media flow module (fp) to understand flow distribution patterns in my system. in the 2-D form it was working pretty neat. When I scaled it up to a 3D problem,...
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