When simulating hypersonic flows using the default one-temperature approach, Gupta curve fits [57] are applicable for temperatures up to 30,000 K.
 | (17–1) |
where 
and 
are the species viscosity and thermal conductivity respectively,
is the static temperature, and A, B, C, D, E are species dependent
coefficients. For ions and electrons, those coefficients are evaluated at the electron
limiting pressure. A correction term should be multiplied for other electron pressures and is
defined as:
 | (17–2) |
where 
is the electron pressure.
Gupta curve fits are the default methods for air mixtures
(air-2species-nitrogen,
air-5species-park93,
air-11species-park93, and
air-11species-gupta). For other mixtures, Gupta curve fits are
unavailable due to lack of data.
After importing one of the applicable air mixtures, you can specify
gupta-curve-fit-viscosity and
gupta-curve-fit-conductivity for species
Viscosity and Thermal Conductivity,
respectively, as shown in Figure 17.1: Create/Edit Materials Dialog Box with Gupta Curve Fit
Properties.
Once selected you can examine the coefficients as shown in Figure 17.2: Gupta Curve Fit Conductivity Dialog Box by clicking Edit... for either thermal conductivity or viscosity.
