#### CFD_GAS

###### CFD
*CFD_GAS
"Optional title"
sid
type, gid
$\rho$, $\gamma$, $e$
##### Parameter definition
VariableDescription
sid Subdomain ID
type Gas type
options:
AIR $\rightarrow$ air at 1atm and 293K
USER $\rightarrow$ user defined
gid Geometry ID
$\rho$ Density (this line is only used if type=USER)
$\gamma$ Fraction between C${}_\mathrm{p}$ and C${}_\mathrm{v}$
$e$ Internal energy per unit volume
##### Description

This command is used to fill a region of the CFD_DOMAIN with air (pressure $1atm$ and temperature $293K$) or with a user defined gas.