# What is "R" in compressibleTwoPhaseEulerFoam bubble column tutorial?

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 June 1, 2013, 18:55 What is "R" in compressibleTwoPhaseEulerFoam bubble column tutorial? #1 Member   einat Join Date: Jul 2012 Posts: 31 Rep Power: 7 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!!

 June 2, 2013, 01:48 #2 Senior Member     Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,209 Rep Power: 20 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.

 June 2, 2013, 12:22 #3 Member   einat Join Date: Jul 2012 Posts: 31 Rep Power: 7 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?

 June 2, 2013, 12:24 #4 Senior Member     Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,209 Rep Power: 20 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.

 June 2, 2013, 12:30 #5 Member   einat Join Date: Jul 2012 Posts: 31 Rep Power: 7 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; } }

 June 2, 2013, 23:51 #6 Senior Member     Ehsan Join Date: Oct 2012 Location: Iran Posts: 2,209 Rep Power: 20 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.

 August 2, 2013, 11:36 i need to simulate the sperical bubble growth #7 Member   Anil Kunwar Join Date: Jun 2013 Posts: 62 Rep Power: 5 can the compressibleTwoPhaseEulerFoam used for the simulation of the growth of a spherical bubble? thanking you in advance.

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