arshud - Compute given density factor ρ2/ρ1

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3.3.2 arshud - Compute given density factor $ρ2/ρ1$

DOUBLE PRECISION FUNCTION AR03AA(G,D,IERR)
  DOUBLE PRECISION G, D
  INTEGER IERR

Compute pressure factor based upon density factor $ρ2/ρ1$ .

Performance
Fixed

Arguments

G - REAL: ENTRY: Specific heat constant $γ$ .
D - REAL: ENTRY: Density fraction $0 <ρ /ρ < √︃-γ+1- 2 1 γ-2$ .
IERR - INTEGER: EXIT: (optional) Return status code.

Status codes

-1: Specific heat ratio $γ≤ 1$ .
-2: Given $ρ2/ρ1$ out of range.

Return Value
Pressure fraction $p2/p1$ or NAN on error.

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