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What is "R" in compressibleTwoPhaseEulerFoam bubble column tutorial?

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Old   June 1, 2013, 18:55
Default What is "R" in compressibleTwoPhaseEulerFoam bubble column tutorial?
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einat
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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!!
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Old   June 2, 2013, 01:48
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R is clearly the universal gas constant for air.
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Old   June 2, 2013, 12:22
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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?
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Old   June 2, 2013, 12:24
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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.
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Old   June 2, 2013, 12:30
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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;
}
}
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Old   June 2, 2013, 23:51
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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?
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Old   August 2, 2013, 11:36
Default i need to simulate the sperical bubble growth
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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.
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