arshud - Compute given density factor ρ2/ρ1

Compressible Flow Subroutine Library
Programming Reference Manual
Version 1.0 DD-00008-010

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

double arshud(double g, double d, int *ierr);

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

Performance
Fixed

Arguments


Argument	Intent	Description

g	in	Specific heat constant $γ$ .
d	in	Density fraction $√︃ --- 0< ρ2/ρ1 < γγ+-12$ .
ierr	out	(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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