The compressible fluid solver needs specific definitions of the gas model, its dynamics, boundary conditions and initial conditions.

### Fluid

Available modes for the dynamical effects of the fluid are

- inviscid model with
`DYNAMICS=INVISCID|EULER`

. - laminar model with
`DYNAMICS=LAMINAR|DNS`

.

### Gas model

Typhon can currently handle only one species. The only gas model is an ideal gas (perfect gas with constant heat capacities). The gas model is defined in `BLOCK:MODEL`

.

Viscosity definition is available through

- Sutherland law (
`VISCOSITY=SUTHERLAND`

) and then`SUTH_DYNVISC`

,`SUTH_TREF`

`SUTH_TSUTH`

constants - constant dynamic viscosity (
`VISCOSITY=CONSTANT|DYNAMIC-CONSTANT`

) and then`DYN_VISC`

constant - constant kinematic viscosity (
`VISCOSITY=KINEMATIC-CONSTANT`

) and then`KIN_VISC`

constant

Whatever the definition of viscosity, the conductivity coefficient is defined through a constant Prandtl number.

### Boundary Conditions

- wall (isothermal, adiabatic, coupled) and moving wall
- symmetry
- subsonic or supersonic inlet
- subsonic or supersonic outlet