FrozenSpecies

class FrozenSpecies

Bases: Flow360BaseModel

A single entry in a pre-mixed thermally-perfect gas (ThermallyPerfectGas).

“Frozen” refers to the composition: the species’ mass fraction is fixed at the time the simulation parameters are built, and the per-species NASA-9 coefficients are blended into a single mixture polynomial before the simulation runs. The runtime then sees one fixed-composition gas, never transports the individual species.

For actively-transported species (variable composition, runtime mass-fraction transport equations, composition-dependent thermo/transport), use the Species class with SpeciesTransportModel instead.

Attributes

name: str

Species name (e.g., ‘N2’, ‘O2’, ‘Ar’)

nasa_9_coefficients: NASA9Coefficients

NASA 9-coefficient polynomial for this species

mass_fraction: float

Mass fraction of this species (must sum to 1 across all species in mixture)