[Maksim154]

Dear Friends,
I would really appreciate if somebody explains me how temperature is calculated in compressibleInterFoam and compressibleMultiphaseInterFoam solvers. As far as I understand isochoric heat capacity is coefficient of proportionality between temperature and internal energy and isobaric heat capacity is coefficient of proportionality between temperature and enthalpy. But don't we need to know internal energy (enthalpy) for a one given temperature? Also why do we need heat of fusion if nothing is fused?
Thank you!
Maksim

[dlahaye]

Possibly I miss something. Allow me to attempt to give an answer nevertheless.

Originally Posted by Maksim154

Dear Friends,
I would really appreciate if somebody explains me how temperature is calculated in compressibleInterFoam and compressibleMultiphaseInterFoam solvers. As far as I understand isochoric heat capacity is coefficient of proportionality between temperature and internal energy and isobaric heat capacity is coefficient of proportionality between temperature and enthalpy.
Thank you!
Maksim

Agreed.

Originally Posted by Maksim154

But don't we need to know internal energy (enthalpy) for a one given temperature?

If c_p is a constant, then h = c_p T is straightforward. Else relationship is non-linear and equation is solved by iteration.

Originally Posted by Maksim154

Also why do we need heat of fusion if nothing is fused?

OpenFoam stores heat of fusion for those cases in which it is required.

But again, I might miss something.

[Maksim154]

That is what I thought - zero enthalpy (internal energy) means zero temperature - many thanks!