Thermal Compressibiliy
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Captain Slow
- Posts: 72
- Joined: 10 Nov 2009, 19:17
Thermal Compressibiliy
In the Navier-Stokes exations, one of the material compressibility model options is ''Thermal'', would I be correct in assuming that this is Isothermal compressibility I.E. compressibility with constant temperature?
Re: Thermal Compressibiliy
Hi,
the "thermal" model is a lot like the "Boussinesq" model for incompressible flow, i.e.
rho=rho_0*(1-beta(T-T_0)). The density depends on the temperature everywhere though,
not just in the body force terms for the momentum equations.
There is also "pressure dependent" compressibility model, where you need to specify
the "density" and "drho/dp" (both in terms of pressure) as material parameters.
The ideal gas model with constant temperature is also an option (and similiar to the
'pressure dependent' model with rho=c*(p+p_0), drho/dp=c).
Regards, Juha
the "thermal" model is a lot like the "Boussinesq" model for incompressible flow, i.e.
rho=rho_0*(1-beta(T-T_0)). The density depends on the temperature everywhere though,
not just in the body force terms for the momentum equations.
There is also "pressure dependent" compressibility model, where you need to specify
the "density" and "drho/dp" (both in terms of pressure) as material parameters.
The ideal gas model with constant temperature is also an option (and similiar to the
'pressure dependent' model with rho=c*(p+p_0), drho/dp=c).
Regards, Juha