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Old   March 29, 2001, 08:52
Default best liquid-vapour modelling
  #1
Zane Joze
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hi everybody

just want to know some suggestions about two-phase modelling (liquid-vapour), what methods are the simpliest and very exact?

thanks for any help

zane
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Old   March 30, 2001, 04:30
Default Re: best liquid-vapour modelling
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Bubba
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Answer is problem dependent. State your problem and then one can answer...
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Old   March 30, 2001, 11:03
Default Re: best liquid-vapour modelling
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Dia Zeidan
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Hello,

I'm working with two-phase flow (liquid-vapour). could you please explain what do you mean by simplest and very exact.

regards

Dia
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Old   April 5, 2001, 03:12
Default Re: best liquid-vapour modelling
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Zane Joze
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Well the situation is like this. I believe all the comercial program and codes are limited to some general problems in CFD. In my case special time dependent boundary conditions are used. I am used to do all the code by myself, but to this time I simulated only one phase (liquid phase). I have sola-vof and nasa-3d source codes, but to set my boundary conditions into the codes and adjust the code is far two complicated. I rather discretised equations and programming all by myself. So is there any good books or papers where equations for liquid-vapour phase are described in discretised form (all terms included). I found Fletcher's CFD book for liquid phase very easy to read, where all terms are precisesly described. I wrote From that form it is not hard to write a program to solve equations. Any suggestions? Thanks. Zane
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Old   April 10, 2001, 10:52
Default Re: best liquid-vapour modelling
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Dia Zeidan
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Why don't you solve for single pressure model.
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Old   April 12, 2001, 16:27
Default Re: best liquid-vapour modelling
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Bubba
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For multiphase modelling you can go several ways depending on the degree of complexity you want.

ie.

1) homogeneous model 2) 6 equation model 3) 1 fluid model

Interface tracking models use a one fluid formulation. Looking at this the NS equations are the same as in a one fluid, except you will want surface tension and the second part of the viscous term. The method to solve this equation is typically done using a projection method however I am seeing more and more people using Simple schemes.

---------------------------------------------------- Good books...

1)Ferziger and Peric: (Computational Methods for Fluid Dynamics)

2)Patankar: Numerical Heat Transfer and Fluid Flow.

---------------------------------------------------- Did you want mass transfer in the model as well? This is the fun part
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