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compressibleInterFoam: specific gas constant of liquids

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Old   February 1, 2015, 11:24
Question compressibleInterFoam: specific gas constant of liquids
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Hey,

I am a new user on OpenFoam. I would like to run a compressible, multiphase (molten metal and air) case with compressibleInterFoam. I use “perfectFluid” for the molten metal and I have a question about the specific gas constant R. The significance of this value has already been discussed in the thread http://www.cfd-online.com/Forums/ope...ion-state.html .
Why is the gas constant in the tutorials for water 3000? I don´t know whether the value was calculated or just selected.

Regards,
Niklas
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Old   April 10, 2015, 06:12
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mohammed musthafa
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Dear Niklas
Its easy to run that case, but the gas constant value given in tutorial is not correct. So kindly check all the values before you run your case.

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musthafa
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Old   May 17, 2016, 04:23
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Huynh Phong Thanh
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Dear all,

I computed the fluid constant R with perfect fluid state for water material that it is difference tutorial compressibleInterFoam OF 2.2.2

R = \frac{8314.32}{Mole Weight}=\frac{8314.32}{18}=461.9066667 J/(kg K)

But in tutorial R equal to 3000 J/(kg K).

Does any people explain me what R tutorial value is?

Thank you so much,
Thanh
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Old   November 5, 2017, 17:59
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M. C.
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Quote:
I computed the fluid constant R with perfect fluid state for water material that it is difference tutorial compressibleInterFoam OF 2.2.2

R = \frac{8314.32}{Mole Weight}=\frac{8314.32}{18}=461.9066667 J/(kg K)

But in tutorial R equal to 3000 J/(kg K).
compressibleInterFoam : biphasic, compressible, equation of state

I was looking for an explanation of R and I found your post. I think your calc is correct.
According to a previous post, I think that value 3000 is to give an incompressible behavour to liquid phase of specie; 461.9 should refer to compressibility factor for vapour phase of water ...just a trick...should it be?
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Old   January 22, 2024, 11:04
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Nainah
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Hi there,
In the compressibleInterFoam solver, how can the value of air density be adjusted?

Thank you
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compressibleinterfoam, gas constant, perfectfluid, psi, thermophysicalproperties

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