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Initialization : compressible flow

D 3 septembre 2009    

Initial conditions for compressible flow solver is defined in BLOCK:INIT section. One can use

  • the solution is the CGNS mesh file with TYPE=CGNS
  • the solution is TYPHON internal format with TYPE=TYPHON or TYPE=TYS
  • or user-defined fields (default) with TYPE=DEFINITION where symbolic functions of X,Y,Z can be used.

Example (Lamb vortex definition) :

 P        = 1.E5 - 1.161*900/2*exp(1-(X*X+Y*Y)/4)
 TI       = 300
 VX    = 20-30*Y/2*exp(0.5*(1-(X*X+Y*Y)/4))
 VY    =    30*X/2*exp(0.5*(1-(X*X+Y*Y)/4))
 VZ    = 0.

Combinations of quantities could be

  • static or stagnation pressure P, PI
  • density, static or stagnation temperature DENSITY, T, TI
  • velocity as
    • components VX, VY, VZ
    • Velocity magnitude and direction VELOCITY, DIRECTION
    • Mach magnitude and direction MACH, DIRECTION

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