Boundary condition setting problem for electrode
Hi! I am using transport of diluted species to simulate particle movement in discharge but have some problems with the boundary condition setting for the electrode: the electron move towards the...
View ArticleDEP particle tracing for fluid flow COMSOL 4.3 simulation
Hi, I've tried to simulate dielectrophoresis by using the particle tracing for fluid flow module of COMSOL 4.3, but I' ve encountered some problems with the dielectrophoresis force. I am trying to...
View ArticleBulk velocity on parallel lines
Hi all I have a two layer geometry. On the interface for calculation of mass transfer coefficient I need to Reynolds number how that velocity in reynolds relation for any point is bulk velocity of...
View ArticleSolver Issues
Dear Ivar, I am trying to solve 2D Marangoni effect due to solute evaporation. I never succeeded. Therefore I tried a different system in which Marangoni stresses come into play due to temperature...
View ArticleHow to define a mixture of two miscible liquids at the inlet?
Hello, I have a question about how to define a mixture of two miscible liquids (for instance water and ethanol) at the inlet. My 2D geometry is as follows: I have two parallel rectangles (representing...
View Articlephase field
Dear Ivan My name is Konstantinos Karalis and I am a PhD Student at the National Technical University of Athens. I am trying to work with phase field or level set on a ternary fluid system. Do you know...
View ArticleAbsolute tolerance convergence criteria for flow simulations.
Hey. Normally convergence criteria are divided into a relative and an absolute. Where can I find and set the absolute tolerance for my transient flow simulation. Thank you for your time
View ArticleQuestion on heat transport turbulence model
Hi, I am using the Non-Isothermal Flow (nitf) module and I have a question on the heat transport turbulence model. In the equation given by COMSOL, rho * Cp * dT/dt + rho * Cp * u . Grad(T) = Grad . (k...
View ArticleTime dependent fluid problem
Hi I am trying to model a time dependent flow of a newtonian fluid in 2D. The geometry I'm using has sliding walls which cause a flow to be established. The aim of using a time dependent simulation is...
View ArticleWelcome to a new forum!
Welcome to The COMSOL Discussion Forum. The goal of the COMSOL Community section is to improve the community experience through increased communication, fellowship, and inclusiveness. It is a place for...
View ArticlePoisson Nernst Planck and Navier Stokes equation
Hi everyone, I am trying to simulate the electro-osmotic flow in a nano-channel using the Poisson-Nernst-Planck and Navier-Stokes equations coupling them from the Electrostatics,Transport of dilute...
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 ArticleVarious Problems for Two Phase Flow coupling with Electrostatic
Hi! I am working on Two Phase Flow coupling with Electrostatic using transient (phase initialization and time dependent) solver to simulate electrospray phenomenon, I have encounter some problems and...
View ArticleHow to define a mixture of two miscible liquids at the inlet?
Hello, I have a question about how to define a mixture of two miscible liquids (for instance water and ethanol) at the inlet. My 2D geometry is as follows: I have two parallel rectangles (representing...
View ArticleResult of the solution not equivalent to the initial boundary setting
Dear Sir Nagi Elabbasi, 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 ArticleError in Two Phase Flow
I am using the Level Set Method in Comsol. When I am using the Time dependent solvers I get the following error- Failed to find consistent initial values. Last time step is not converged. The same...
View Articlecoupled application
This is kumar,can anybody help me to implement the coupled application about electromagnetic flow meter to solved the flow rate analysis- for analysis this device i have a some clarification also, 1....
View ArticleInternal error in piecewise expression evaluation
Merry Christmas everybody, I was simulating a laminar flow in a heated circular duct with a non-newtonian Fluid. In order to describe the dynamic viscosity I used the non-newtonian power law with the...
View ArticleSimulation of a heated mixer
Hi everyone, In a school project, we are trying to simulate liquid mixed and heaten. We have simulated the heating, which works. However, when we're trying to simulate the mixing, it always fails. To...
View Articleheat transfer in fluids time dependent error
Hi My problem combines laminar flow and heat transfer in fluids. It runs OK in stationary mode. It runs OK also in either time dependent flow or heat transfer . If I try heat transfer+flow in time...
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