CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Running, Solving & CFD

What is "R" in compressibleTwoPhaseEulerFoam bubble column tutorial?

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

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   June 1, 2013, 19:55
Default What is "R" in compressibleTwoPhaseEulerFoam bubble column tutorial?
  #1
Member
 
einat
Join Date: Jul 2012
Posts: 31
Rep Power: 13
einatlev is on a distinguished road
Hello
I am trying to decipher the input files for the two-phase example of a bubble column, in order to be able to modify them for my own application.
I understand all the 'transportPropoerties' info except for "R":

phase1
{
rho 1;
rho0 0;
R 287;
Cp 1007;

nu 1.589e-05;
kappa 2.63e-2;

diameterModel isothermal;
isothermalCoeffs
{
d0 3e-3;
p0 1e5;
}
}


Any ideas?
Thanks!!
einatlev is offline   Reply With Quote

Old   June 2, 2013, 02:48
Default
  #2
Senior Member
 
immortality's Avatar
 
Ehsan
Join Date: Oct 2012
Location: Iran
Posts: 2,208
Rep Power: 26
immortality is on a distinguished road
R is clearly the universal gas constant for air.
__________________
Injustice Anywhere is a Threat for Justice Everywhere.Martin Luther King.
To Be or Not To Be,Thats the Question!
The Only Stupid Question Is the One that Goes Unasked.
immortality is offline   Reply With Quote

Old   June 2, 2013, 13:22
Default
  #3
Member
 
einat
Join Date: Jul 2012
Posts: 31
Rep Power: 13
einatlev is on a distinguished road
Thanks immortality. I thought it was something like that, but I'm not sure why the value of R for the second phase (water) is set to be 1e10. Is this a randomly large number, or does it have any meaning?
einatlev is offline   Reply With Quote

Old   June 2, 2013, 13:24
Default
  #4
Senior Member
 
immortality's Avatar
 
Ehsan
Join Date: Oct 2012
Location: Iran
Posts: 2,208
Rep Power: 26
immortality is on a distinguished road
your welcome.where it has defined for water?
------------
I think because its not gas it has given a high value so that its increase in volume due to heat addition in constant pressure is small then specific heat is high.
__________________
Injustice Anywhere is a Threat for Justice Everywhere.Martin Luther King.
To Be or Not To Be,Thats the Question!
The Only Stupid Question Is the One that Goes Unasked.
immortality is offline   Reply With Quote

Old   June 2, 2013, 13:30
Default
  #5
Member
 
einat
Join Date: Jul 2012
Posts: 31
Rep Power: 13
einatlev is on a distinguished road
In file transportProperties:

phase2 //liquid
{
rho 1027;
rho0 1027;
R 1e10;
Cp 4195;

nu 3e-7;
kappa 0.668;

diameterModel constant;
constantCoeffs
{
d 1e-4;
}
}
einatlev is offline   Reply With Quote

Old   June 3, 2013, 00:51
Default
  #6
Senior Member
 
immortality's Avatar
 
Ehsan
Join Date: Oct 2012
Location: Iran
Posts: 2,208
Rep Power: 26
immortality is on a distinguished road
i updated the above post if you have seen and also thank you for reputation.
Could you find a formula of R that can argue for liquids?
__________________
Injustice Anywhere is a Threat for Justice Everywhere.Martin Luther King.
To Be or Not To Be,Thats the Question!
The Only Stupid Question Is the One that Goes Unasked.
immortality is offline   Reply With Quote

Old   August 2, 2013, 12:36
Default i need to simulate the sperical bubble growth
  #7
Member
 
Anil Kunwar
Join Date: Jun 2013
Posts: 64
Rep Power: 11
Annier is an unknown quantity at this point
can the compressibleTwoPhaseEulerFoam used for the simulation of the growth of a spherical bubble? thanking you in advance.
Annier is offline   Reply With Quote

Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search
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 Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Bubble size distribution : Bubble column oj.bulmer CFX 8 June 7, 2019 06:03
[OpenFOAM] Bubble Column tutorial physics1 ParaView 5 October 31, 2017 07:18
Bubble Column Modelling dlaw FLUENT 24 October 31, 2017 07:01
bubble column ken FLUENT 1 June 30, 2013 02:18
bubble rising in a column swamysrikanth Main CFD Forum 2 September 27, 2010 09:59


All times are GMT -4. The time now is 15:14.