armcrla - Critical mach number given Cp0 using Laitone pressure approximation

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3.4.4 armcrla - Critical mach number given $Cp0$ using Laitone pressure approximation

DOUBLE PRECISION FUNCTION AR04AD(G,CP0,IERR)
  DOUBLE PRECISION G, CP0
  INTEGER IERR

Compute critical mach number given $Cp0$ Laitone pressure approximation.

Performance
Iterative

Arguments

G - REAL: ENTRY: Specific heat constant $γ$ .
CP0 - REAL: ENTRY: Critical pressure coefficent $C p0$ .
IERR - INTEGER: EXIT: (optional) Return status code.

Status codes

-1: Specific heat ratio $γ≤ 1$ .
-2: Iterative solver failed.

Return Value
Critical mach number $Mcrit$ or NAN on error.

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