Equation Of State Unit

Kamayan uses singularity-eos to perform equation of state calls. The equation of state converts between a set of thermodynamic variables, namely density, internal energy, pressure and temperature for a given fluid component.

Note

Only the gamma law equation of state from singularity is currently supported

In order to support a wide range of possible equation of state capabilities (e.g., 1 & 3 temperature, and multiple species) a single equation of state is wrapped in the EOS_t type that is owned by the material unit. The type wraps the visitor pattern needed to call the implementations in the variant. The eos gets called with a subpack that can index into the required variables for the EosComponent. The variables associated with a given component are defined in a TypeList EosVars<eos_component>::types type trait that is specialized for each option. There is an EosVariables typedef that can be used to determine the variables needed for a given Fluid method.

Finally the equation of state needs to be told what fields to treat as input, and what to fill as the output into the indexer.

Eos modes

mode	input	output
ener	EINT DENS	PRES TEMP
temp	TEMP DENS	PRES EINT
pres	PRES DENS	EINT TEMP

EosWrapped

Often there isn't a need to call the equation of state directly for a given cell, rather one wishes to have the equation of state called over all cells on the domain to make the state thermodynamically consistent. When this is the case one can just depend on the EosWrapped call to call the equation of state on an entire MeshData or MeshBlock.

Parameters

Paramter	Type	Default	Allowed	Description
<eos>
mode_init	String	dens_pres	[ dens_pres, dens_ener, dens_temp, ]	eos mode to call after initializing the grid.