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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) :

BLOCK:INIT  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. ENDBLOCK

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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