EOS library routines

Files

eos.h C++ source

Input

Reading an EOS of unknown type - i.e. reading to an object of class (eos *) - a word is read first, and compared against the name of each EOS class. If a match is found, an object of that class is instantiated. The data for that object is then read (see below for manuals on specific classes).

In other words:

eos_type
eos_parameters

Software interface

eos.h defines a `state' class and an abstract `eos' class.

State (`state') class

The `state' class is a primitive state - its data members include only density (`rho') and specific internal energy (`e').

A state instance can be created with a defined density and energy, e.g.

state a(rho,e);

Generic equation of state (`eos') class

Specific EOS types inherit from `eos'. As `eos' is abstract, members can't be instantiated - if you don't know what type an EOS will be until run-time, only a pointer to an EOS can be used in the program.

The `eos' class includes methods for calculating thermodynamic quantities. All take a state as argument. The methods are

p: pressure
t: temperature (default method returns -1 for `invalid'.
dpdv and dpde: pressure derivatives
csqv: square of sound speed
cv: specific heat capacity at constant volume
h: specific enthalpy (h = e + pv)
s: specific entropy
f_helmholtz: specific Helmholtz free energy (f_h = e - Ts)
f_gibbs: specific Gibbs free energy (f_g = e + pv - Ts)