s := zone.thermal.model(z)
zone.thermal.model(z) := s

Get/set the thermal flow constitutive model for the zone. The currently available constitutive models are advection-conduction, anisotropic, hydration, isotropic, and null.

Returns:s - the name of the current thermal constitutive model
Accepts:s - the name of the new thermal constitutive model
Arguments:z - a pointer to a zone