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Old   December 7, 2010, 08:50
Default thermophysicalProperties
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Tobias Holzmann
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Hi all,

i 'm working with chtMultiRegionSimpleFoam and want to implement new thermophysicalProperties.

Thats the code i used until now
Code:
thermoType hRhoThermo<pureMixture<constTransport<specieThermo<hConstThermo<incompressible>>>>>;
mixture         water 1 18 1000 4181 0 959e-6 6.62;

and now i want to use that one to make cp / rho temperature dependend

Code:
// thermoType hRhoThermo<pureMixture<icoPoly3ThermoPhysics>>;
// mixture
//     water 1 18
//     rhoPolynomial (1000 0 0)
//     0
//     0
//     CpPolynomial (4181 0 0)
//     muPolynomial (959e-6 0 0)
//     kappaPolynomial (145e-6 0 0)
But i can' t find anything about how to use it. And which entry i have to change.
Read in the UserGuide about icoPoly4ThermoPhysics - but there is nothing.

Using OF-1.7.x and the code is in the multiRegionLiquid case.

and what 's kappa ? I compare all values with my table of water and think that

mu is the dynamic viscosity - rho and cp is clear but what 's kappa


did someone know how to use this ?

Best reguards Tobi
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Old   December 9, 2010, 09:31
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Old   December 9, 2010, 11:21
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Christian Lucas
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Hi

this is a guess; to be sure have a look at the code.

kappa is called isothermal compressibility coefficient and is defined as -1/v * (dv/dp)@T=constant, where v is the spec. volume. Have a look at a thermodynamics book e.g. “Thermodynamik kompakt” page 53 (sorry for the german reference )

Kappa is needed to calculate psi

Regards,
Christian
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