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Compressible fluid model

D 29 July 2014    


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.

example of Helium definition
BLOCK:MODEL
 GAS=PERFECT    ! example: Helium
 GAMMA=1.6667
 MOLWEIGHT=.004
 PRANDTL=0.1
 VISCOSITY=SUTHERLAND
 SUTH_DYNVISC=.000019
 SUTH_TREF=273
 SUTH_TSUTH=79.4
ENDBLOCK

Boundary Conditions

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

Initial Conditions

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