How to specify a particle distribution in particle tracing.
i wish to simulate a particle tracing in a fracture. i can do this programmaticly with fortran. i want a lognormal distribution of particle diameter. so when i start the simulation at time=0 a...
View ArticleForce convected with fan
Hi, I have to simulate air turbolent flow within a cavity; i need to simulate a fan rotating and i have to determine efficency with cw and aw ratation. What physic I have to use? I think rotating...
View ArticleFault Modeling
Hello everyone, I was just wondering can I model a fault, or generally a discontinuity in COMSOL? If yes, how ? Can ((deformed geometry)) be used ? Thanks a lot, Faraz
View Article[Chem. Eng. Module, Comsol 3.5a] Time dependent turbolent flow simulation
Hi to all, I'm simulating with the Chemical Engineering Module of Comsol the fluid flow in a pipe with a lenght of about 6m and radius of 0.5m. As preliminar approach, I'm working on a 2d model of such...
View ArticleTube Heat Exchanger
Dear COMSOL community. I am new in COMSOL and I have some problems with my simulation. Mayby anybody could help me. I try to simulate a heat exchanger. Steam is condensing on the outside. The heat is...
View ArticleInvalid field variable in property Llimitfivar
Hi, I'm new to Comsol 5.1 version and i have a problem with my simulation. Does anybody know what "Llimitfivar" is? I'm searching for it's meaning for some time and i can't find anything. I have no...
View ArticleCoupling poisson equation and level set method
Hi all, I have been trying this for months now, couldn't figure it out. Is it possible to couple poisson equation with level set method, I have a simple pressure equation in the form of poisson...
View ArticleVelocity Oscillation near No-Slip Boundary
Dear All, I found a problem in my 2D comsol simulation when I am solving N-S equations in cylindrical coordinate. I use the creeping flow and neglect inertial. And I use P1+P1 discretization. My...
View ArticleCooling process with pipe flow + stress analysis - time dependent
Hello Comsol Community! I am currently working on the process of an injection molding process. I am interested in seeing the cooling process and the temperature distribution during the cooling process...
View ArticleFalling sand tutorial
Hello I have gone through the falling sand tutorial and understand why the problem was modelled the way it was. Now, the problem in the tutorial was solved in a 2D axisymmetric coordinate system. When...
View Articlenatural convection problem
Hello COMSOL users I am doing a simple natural convection flow problem in a rectangular cavity. Gravity is in the negative y (vertical) direction. There are two inlets and two pressure outlets. This is...
View ArticleInvalid property value
Hello community, I have a problem when I run a simulation about particle tracing. Its about the particles in the laminar flow. I can compute the first step , laminar flow, with no problem. however...
View ArticleLaminar flow through a cube with a hole at bottom
Dear Comsol users, I am relatively new to comsol, but have been working for quite sometime. I was just wondering why is it so difficult (not converging even after 100 iterations) to solve a laminar...
View ArticleVery ill-conditioned preconditioner.
Hi- I am modeling a fluid flow in a pipe that is ~15 meters long with a reducer on each end of the pipe. This pipe will eventually become a chemical reactor. I obtained the following message about the...
View ArticleTurbulent flow with macroscopic sized particles
Hello, I'm working on simulating a flow that drag particles in a duct. I already have the flow simulation, but when I try to add particle tracing for fluid flow, the particles go straight and don’t...
View ArticleIssues with Multiple Types of Meshing in Model- Faces Locked by Adjacent Domain
Hello all! I've been having issues with my COMSOL project. I figured out how to add Swept Mesh (Triangular) to where I needed it, but I could not add Free Tetrahedral Mesh to the remaining geometry...
View ArticleFluid-Structure Interaction Particle blockage
Hello! Have a nice day! I am solving one problem in COMSOL Multiphysics Fluid-Structure Interaction model (FSI) at the moment. I need to take results in which particles must blockage porous media. I...
View ArticleTime dependent Optimization
Hi all, I have already modelled the time dependent simulation for porous media. I have two equation variables. !) for inlet in to CFD (time dependent equation with two time parameters.) 2) an another...
View ArticleChanging the diffusion coefficient has no effect
Hello everyone, I tried to model the residence time distribution of a (dye) tracer in a static mixer. I first computed a stationary laminar flow field and then conducted a time-dependent study using...
View ArticleHigh Mach number turbulent flow in converge diverge nozzle, COMSOL 5.1
Hi I am trying to simulate the motive nozzle in ejector which is simply converge diverge nozzle. The flow inside this nozzle is the carbon dioxide. At inlet the flow start as incompressible flow then...
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