parametric sweep study depending on a parametric sweep study
Hello, I am having a big issue here in my simulation. I have two studies: Study 1: I did a parametric sweep stationary study with a first physics model (laminar flow) for different geometries with only...
View ArticleHow to implement Discrete Elastic Viscous Split Stress (DEVSS) method for...
Hi there, I am trying to simulate FENE-CR viscoelastic fluid in COMSOL. It seems from the literature that the DEVSS technique gives stability to the simulation of viscoelastic fluids. Anybody can...
View ArticleLiquid-Vapor interface drops very fast
Hi I have encountered a problem in COMSOL when using the âlaminar two-phase flow, moving meshâ physic. A simple model indicating what I am trying to solve is provided in the attachment. As you can see...
View ArticleBoundary condition is a PDE, rather than a constant!
Dear all: In my model for fluid flow in porous media, I want to set gas pressure as boundary condition at one end of the soil specimen. In the experiment, the gas pressure is applied on the specimen by...
View ArticleWhere do I start to make a simulation of the degradation of a syringe rubber...
I am new to Comsol and barely have a week using it. I am trying to simulate the degradation of a syringe rubber stopper with liquid in the syringe. May someone give some pointer on where to start.
View ArticleOut of Memory in Time Dependent Solver
Hello, I'm simulating the effect of forced convection on a system consisting of a thermo-electric module and heat sink and every time I try to compute it, I get an 'Out of memory in Time Dependent...
View ArticleLaminar Flow
Hi, I'm simulating a micro channel using Laminar flow Physics. My model works perfectly when i give flow rate at the input and chose "0" Pa at the output. The solution doesn't converge when i chose...
View ArticleParticle tracing module. Latent heat
Hello, I would like to simulate velocity, trajectory, temperature and melting small particle of silica (<500 um).I use particle tracing module and non-isothermal flow module. Particle temperature...
View ArticleModelling a Fuel Cell
Hi, I'm trying to learn how to use COMSOL to model a Fuel Cell. I don't have the Fuel Cells and Batteries Module, so I'm trying to work from the basic package. Being new to COMSOL, I don't have much...
View ArticlePinning the drop contact points
Hi everyone. I wonder if it is possible to fix the level set variable (phi) on a solid wall so that the contact points don't move? (Neither horizontally nor vertically). See the attached picture for...
View Article2D Droplet break up in plannar flow focusing geometry
Dear COMSOL users, I am trying to simulate the formation of water-in-oil droplets in a plannar flow focusing geometry. The physics I am using is the laminar flow-phase field. The boundary conditions...
View ArticleSchiller Neuman SLIP Velocity Mixture Model V3.5a
Hi folks. I have trying to use the Schiller Neuman Slip velocity model for a few days but no success. I am successful in using the Hadamard-Rybczynski but I need to use the Schiller Model for...
View ArticleObject movement
Dear COMSOL Community, As a part of my thesis i have to simulate an up and down movement of a cylinder (e.g. plastic, iron) in a liquid (water). I constructed both the cylinder and the iron. how do i...
View ArticleDerivatives in level set or phase field physics
Hi Suppose that you need to solve the heat conduction equation in two fluids coupled to the level set/phase field method: ââ(-kâT)=0 with constant thermal conductivities of the fluids (k). For the...
View ArticleModelling Natural Convection
I'm a new user to Comsol, having used other FE and CFD packages and I'm having difficulty with getting a test model with natural convection to run successfully. I've followed the examples in the help...
View Articleproblems with magnetic field and particle tracing for fluid flow
Dear all, My name is Francesca and I'm working with comsol 5.2a. I'm new in this forum. I hope that someone can help me. I'm currently trying to simulate a magnetic helmet consisting of 60 permanent...
View ArticleHow to Build a control valve in fluid flow system.
I am trying to study creeping flow pattern through the main chamber and bypass by using control valve. Any suggestion how to build the control valve. -- Akash
View ArticleUnable to evaluate an expression
Excuse me, I am getting an error as Attempt to evaluate real square root of negative number. Function: sqrt Failed to evaluate expression. Expression:...
View ArticleDoes Comsol allow only continuous flow ?
Is it possible only to simulate continuous flow in Comsol multiphysics where the liquid is available at the inlet continuously and it leaves at the outlet? How to give the boundary conditions where the...
View ArticleEvaluate mass flow rate needed to remove a certain heat flux
Hi, I'm trying to solve the following problem: I have a 3D model of a box of stainless steel, with an electrical resistance on the top wall and an insulant material all around the box. At the bottom is...
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