CFD Online Logo CFD Online URL
Home > Forums > OpenFOAM

Simulating a "Pseudo-water" flow

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Display Modes
Old   May 18, 2011, 07:06
Default Simulating a "Pseudo-water" flow
New Member
Join Date: May 2011
Posts: 19
Rep Power: 8
mikemech is on a distinguished road

I am trying to calculate the flow inside a heat exchanger, and I am using the "BuoyantSimpleFoam" solver. This solver assumes air and its corresponding thermophysical properties. The thing is, I want to have water instead, so I tried to change the values of thermophysical properties and transport properties so as to simulate "water". So, the original thermophysical properties file was this:

thermoType hPsiThermo<pureMixture<constTransport<specieThermo <hConstThermo<perfectGas>>>>>;
mixture air 1 28.96 1004.4 0 1.831e-05 0.703;

And I modified it so it looks like this:
thermoType hPsiThermo<pureMixture<constTransport<specieThermo <hConstThermo<perfectGas>>>>>;
mixture air 1 18 4213 0 298e-06 1.96;

As you can see, I just substituted Molecular Weight, Cp, latent heat of fusion and Prandtl Number with the values that correspond to water in 95 degrees Centigrade. I also substituted nu in transportProperties file with the value 0,29e-06.

My question is, if all these modifications are enough so as to run a peudo-water flow with BuoyantSimpleFoam solver ? Or I do I need to change other parameters as well?

Thanks in advance
mikemech is offline   Reply With Quote

Old   May 18, 2011, 09:22
Senior Member
Vesselin Krastev
Join Date: Jan 2010
Location: University of Tor Vergata, Rome
Posts: 368
Rep Power: 13
vkrastev is on a distinguished road
I think that you will get incorrect results, as using these settings will produce a density field calculated with the equation of state for perfect gases, which of course cannot be applied to liquid (incompressible) water. There is a much more elegant solution to your problem: use the last updated version of chtMultiRegionSimpleFoam, which allows to set an incompressible equation of state for liquids (if you have an updated 1.7.x version of OpenFOAM, then the solver has already these capabilities, if not take a look here to find where to download the modified source code)

Hope this helps

vkrastev is offline   Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
simulating cotton flow in a pipe abdul moqeet FLUENT 1 February 12, 2016 06:02
Flow meter Design CD adapco Group Marketing Siemens 3 June 21, 2011 08:33
Simulating a high pressure flow through a valve Kromagnsss FLUENT 8 July 2, 2010 05:20
Can 'shock waves' occur in viscous fluid flows? diaw Main CFD Forum 104 February 16, 2006 06:44
Simulating flow past airfoil with different AOA Quarkz Main CFD Forum 2 January 6, 2006 11:56

All times are GMT -4. The time now is 20:26.