van_leer_split_both Subroutine

private pure subroutine van_leer_split_both(q, fp, fm, gam)

Fused van Leer flux splitting: returns F^+ and F^- in one call.

Extracts primitives once and evaluates both split fluxes, handling all Mach-number regimes (supersonic positive, subsonic, supersonic negative).

Arguments

Type	Intent	Optional	Attributes		Name
real(kind=wp),	intent(in)			::	q(:)
real(kind=wp),	intent(out)			::	fp(:)
real(kind=wp),	intent(out)			::	fm(:)
real(kind=wp),	intent(in)			::	gam	Ratio of specific heats.