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miner15kick July 13, 2010 22:41

Two Phase Flow Problem
I am trying to model a simple channel with a two phase system. I have read all the material and forums and included my suggesting in my simulations yet i still have not been able to obtain my solution.

I have a simple channel where i input water and on the bottom surface i apply a constant heat flux. I have tried both inhomogeneous and homogeneous models.

For homogeneous model, i use the default materials water at 25 C and water vapor at 100C as the continuous and dispersed components. Looking at the results I my fluid properties are not changing with phase change and i cannot obtain vapor quality.

For the inhomogeneous model i include the default H2O, H2Ol, and H2Ovl, and include a variable composition mixture of H2O and Ideal Gas. When i model this i get no convergence my simulations crashes. I have changed the parameters to help better convergence but nothing helps.

Is there another way to model a simple two phase flow problem?

Please HELP.


ghorrocks July 14, 2010 08:29

What are you trying to do? Model evaporation or boiling? Phase change of what - droplets, a body of fluid?

miner15kick July 14, 2010 10:04

I am trying to model thermal effects of the channel as the fluid is flowing through. Based on some preliminary findings, the water should be boiling.

ghorrocks July 14, 2010 18:58

You should look at the boiling tutorial files which come with CFX. If you need further help contact CFX support for example files closer to what you are modelling. Boiling models are tricky to set up so you will probably need some help there.

Reza_computational October 28, 2010 11:01

Is there any example file for different problem setups? If any how can I reach them? I need something on water evaporation in which water is modeledd as dispersed fluid...

ghorrocks October 28, 2010 18:03

As I said, contact CFX support as they have a number of example files which may help.

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