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COMSOL Error for Initial Values(RF Module)

I am defining a model with different concentrations of oil and water and trying to measure the heat distribution by using the microwaves. But I obtained the error mentioning Initial values: THE...

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High Viscosity in Two Phase Flow

Hi, I have constructed a two-phase flow model, using the "Droplet Breakup in a T-Junction" model in the gallery. I managed to compute the default model successfully. However, when I change the...

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How to define Function in Definitions / Variables.

I'm currently working on electrical simulation using AC/DC module. I define nonlinear electric conductivity for zinc oxide material using following function(ZnO) in subdomain settings, but it shown...

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How to Improve Convergence in Natural Convection

I am wondering how I can improve convergence in my natural convection model. It is a simple model; an isothermal aluminum plate in water. The model starts out fine but as the run continues (transient...

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Heat Transfer

Actually, I need to give boundary condition to one of the part of my system. At that part, I will use cryocooler of capacity 1 W at 4.2 K, how can I give this boundary condition to particular part. My...

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integral

hi do you know if it possible to calculate this integral in comsol (attach file) ? thanks

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Surge impedance of transmission tower

Hi everyone. I am trying to model an overhead line system, in which the transmission tower should be defined as a surge impedance. I expect the wave will go down the transmission tower and get...

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Setting up a previously solved physics as an initial condition for a second...

I am new to COMSOL 4.3a and I have what seems to be a simple dilemma, but I can't figure it out. I have a model incorporating three different physics. I want to run COMSOL to solve for the first...

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Fixing an Object to a Set Position, Mises Force, Fluid Dynamics

Hello, I am trying to design a 2D microfluidic channel using COMSOL Multiphysics 3.2b. Inside of the channel, I want to fix an object and use COMSOL to calculate the magnitude of the von Mises stress...

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2D TRANSIENT Heat Transfer Problem

Hi everyone, I am encountering an error in the time dependent situation - Failed to find consistent initial values, last time steps not converged. I have specified 'initial values' and the required...

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How to plot the relative error?

I've just spent more than a whole day troubleshooting my model. However, if I could plot the relative error over the geometry, I believe it would have been solved in minutes. There was a problem...

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Multiphase 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...

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How to solve a derived PDE equation with coefficient form?

Dear all: I had derived a PDE equation in attachment. But the result seems to be not correct. Please give me a help. Thanks a lot.

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How to assign automated input values?

Can we assign input values to faces of an object via .csv file or through any web based tools?

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Particle Tracing time plot

Hello, I am attempting to create a 2D map of drift times from release until contact with some defined surface. Is this possible to do in COMSOL? If so, how?

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Concentric Cylinders Viscometer

hi everybody, We are a group of students and we are doing a viscometer with concentric ciylinders. We need to do a simulation of velocity in the time (depent time) and we have a problem with the...

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De-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:...

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Concentration 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...

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Error linking Heat Transfer in Fluids and Turbulent Flow (Spalart-Allmaras)

I am using COMSOL Class Kit 4.1 to model a pretty simple flow of hot air in a vertical pipe. I was able to get the model to working using Laminar flow (all are steady state studies) and the Heat...

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COMSOL Error for Initial Values(RF Module)

I am defining a model with different concentrations of oil and water and trying to measure the heat distribution by using the microwaves. But I obtained the error mentioning Initial values: THE...

View Article
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