Flux of a concentration using weak contributon
Hi,I am solving the advection-diffusion equation of a speceis inside a Domain. Now I want to put a flux of the same species on a boundary using weak contribtion inside that physics. What expression...
View Articletwo way FSI with prescribed displacement causing gaps in mesh
I am experimenting with a very simple two way FSI. A solid square is moved through some air. I place a prescribed displacement on the bottom of the square. What seems to happen is an actual gap in the...
View ArticleClik here to view.
Non convergence error in tpfmm change of boundary
Hello everyone,I have been performing simulations using a tpfmm with time dependant study to simulate an EWOD pixel. For now, I made it move depending on a voltage variable I set as a parameter (so I...
View ArticleCFD
Hi, please help me.I want a constant temperature gradient across a stack of thermoacoustic engine, but transient fluid flow (velocity, pressure variation). Please suggest me the correct phyiscs with...
View Articlenatural convection air inside a double glazed window
Hello, I am studying the behavior of the air inside a cavity with a flow in the exterior face 25 W / m2k and in the face interiro 10W / m2k, the model in transient mode converges me but in stationary...
View ArticleIncapable in obtaining the mesh convergence
Hi Everyone! I made a mode which contains a square micro channel with an particle inside. It has a quiet simple physics configuration: 1. Governing equations: incompressible laminar flow 2. 4 channel...
View ArticleMaterial temperature dependent properties
Hello, I am trying to solve a phase change problem and thereby the properties such as density, conductivity, specific heat are temperature dependant. I input them as piece wise functions with smoothing...
View ArticleNonlinear solver did not converge
Hi everyone!I am trying to analyse Von misses stresses on my 2D spool valve model under the physics of Fluid-Structure Interaction (FSI). I am a new learner that is why i am using FSI example of...
View ArticleMeshing profile 2D
Hi,I am working on a 2D wing simulation. I drew a convexe profile and I want to mesh it before computing a tuburlent flow SST phyisic. I have troubles with my solutions convergence and I think it is...
View ArticleUsing Cylindrical Coordinates to calculate forces from pressure
Hi All,I'm in the process of trying to find the pressures exerted by a flow onto a turbine using the pressure. I've been using cartesian coordinates, which I believe my gives me the correct force in...
View ArticleStokes-Darcy Coupling
Hello everyone,Working on Stokes-Darcy coupling of a simple 2D geometry; two rectanglar domains where the liquid flows first in the Stokes domain then penetrates into Darcy’s through the interface.The...
View ArticleHeat transfer from porous media to groundwater well
Hello, i am new to comsol and would like to simulate the folowing system: The soil should transfer heat to a groundwater well in wich there is a u pipe with another water system (So a second heat...
View ArticleCoupling diffusion and laminar flow at interfaces
I am trying to set up a simple model for simulating evaporation. Basically I have laminar flow in one domain and vapor diffusion (transport of dilute species) in another domain. How do I setup the mass...
View ArticleMatlab script to pull new interpolation grid text files each iteration
I have created multiple geostatistical realisations of K and want to run each of them iteratively using comsol. I figure the best way to use multiple interpolation grid files in multiple simulations is...
View ArticleModeling a Membrane Reactor in 2D axisymmetry
Hi,Please I need assistance in my model. I am developing a model in 2D for water-gas shift reaction in a membrane reactor. I am using the physics interface Reacting Flow in Porous Media (for...
View ArticleTransitional Flow problems in cryo chamber
I am trying to simulate my cryo chamber vacuum system that is being flooded with neon. I know based on my calculations that the Knudsen number places this within the transitional flow regime, which is...
View ArticleHydrocyclone
Hi,I am curently working on hydrocyclone, and i have follows all notes in the attached file, unfortunetly, it is dosn't work.any one can help me please ?Regards O.S.L
View ArticleUsing Integration Operators To Calculate Volume To Use As A Stop Condition
Hi there,I have a multiphase (2 phase) flow of a droplet of a fluid in a flow (domain 2) that eventually leaves domain 1. I want to have the calculation stop when the fluid starts to leave the domain...
View ArticleHow to model inflation of a balloon via pressurized CO2 canister
Hello. I am currently working on a project that is hoping to model the pressure and volume changes in a balloon in response to an input from a gas canister. I am relatively inexpierenced in COMSOL,...
View ArticleFeature 'tcl1' does not support model inputs
I am trying to simulate electrowetting phenomenon in comsol with a drop between two plates with the bottom plate covered with thin dielectric layer ! Now while computing it saysFeature 'tcl1' does not...
View Article