Common File User's Guide - Conversion Factors

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Conversion Factors

This section includes factors for converting to and from SI units. These factors are returned from the subroutine CFUNIT. Only the main factors are included here for reference (CFUNIT will return conversion factors from any supported units to any other supported units of the same type e.g. _C to _R) and to illustrate how basic unit symbols are combined. The following sections begin with the unit type and a list of valid variable names for that type (if any), followed by a list of conversions from the units on the left to the units on the right. These units are used in the CUNITS and DUNITS variable when the mode is 'NEW' and are returned in DUNITS when the mode is 'CURRENT'.

Mass

kg	×	0.0685217658567918	=	slug
slug	×	14.5939029372064	=	kg
kg	×	2.20462262184878	=	lb_m
lb_m	×	0.453592370000000	=	kg
slug	×	32.1740485564304	=	lb_m
lb_m	×	0.0310809501715673	=	slug
kg	×	1000.	=	g
g	×	0.001	=	kg

Length, x, y, z

m	×	3.28083989501312	=	ft
ft	×	0.304800000000000	=	m
m	×	39.3700787401575	=	in
in	×	0.0254	=	m
m	×	100.0	=	cm
cm	×	0.01	=	m
m	×	1000.0	=	mm
mm	×	0.001	=	m

Velocity, u, v, w

m/s	×	3.28083989501312	=	ft/s
ft/s	×	0.3048	=	m/s
m/s	×	39.3700787401575	=	in/s
in/s	×	0.0254	=	m/s
m/s	×	100.0	=	cm/s
cm/s	×	0.01	=	m/s
m/s	×	1000.0	=	mm/s
mm/s	×	0.001	=	m/s

Force

N	×	0.224808943099710	=	lb_f
lb_f	×	4.44822161526050	=	N
N	×	1 × 10⁵	=	dyn
dyn	×	1 × 10⁻⁵	=	N

Pressure, p

N/m²	×	0.0208854342331501	=	lb_f/ft²
lb_f/ft²	×	47.8802589803358	=	N/m²
N/m²	×	0.000145037737730209	=	lb_f/in²
lb_f/in²	×	6894.75729316836	=	N/m²

Gas constant, R

	m²/s²-K		×		5.97995038991999		=		ft²/s²-R
	ft²/s²-R		×		0.167225467570038		=		m²/s²-K

Viscosity, mul, mut

	kg/m-s		×		0.0208854342331501		=		slug/ft-s
	slug/ft-s		×		47.8802589803358		=		kg/m-s

k (of k-ε)

	m²/s²		×		10.7639104167097		=		ft²/s²
	ft²/s²		×		0.09290304		=		m²/s²

epsilon (of k-ε)

	m²/s³		×		10.7639104167097		=		ft²/s³
	ft²/s³		×		0.09290304		=		m²/s³

rho*k (of ρk-ε)

	kg/m-s²		×		0.0208854342331501		=		slug/ft-s²
	slug/ft-s²		×		47.8802589803358		=		kg/m-s²

rho*epsi (of ρk-ε)

	kg/m-s³		×		0.0208854342331501		=		slug/ft-s³
	slug/ft-s³		×		47.8802589803358		=		kg/m-s³

Thermal conductivity, kappa

	N/s-K		×		0.124893860586174		=		lb_f/s-R
	lb_f/s-R		×		8.00679869536116		=		N/s-K

Density, rho

	kg/m³		×		0.00194032033197972		=		slug/ft³
	slug/ft³		×		515.378818393196		=		kg/m³

rho*u, rho*v, rho*w

	kg/m²-s		×		0.00636588035426416		=		slug/ft²-s
	slug/ft²-s		×		157.087463846246		=		kg/m²-s

rho*e0

	kg/m-s²		×		0.0208854342331501		=		slug/ft-s²
	slug/ft-s²		×		47.8802589803358		=		kg/m-s²

Energy, e, h

J (= N-m)	×	0.737562149277265	=	lb_f-ft
lb_f-ft	×	1.3558179483314	=	J (= N-m)
J	×	1 × 10⁷	=	erg
erg	×	1 × 10⁻⁷	=	J

Entropy, s

	J/K (= N-m/K)		×		0.409756760453328		=		lb_f-ft/R
	lb_f-ft/R		×		2.44047224234608		=		J/K (= N-m/K)

Temperature, T

	K		×		9/5		=		R
	R		×		5/9		=		K

Note: Conversion factors and reference conditions are stored in single precision format. When using the conversion factors in computations, use double precision calculations and assign to a single precision variable. This will ensure that accurate conversion factors and reference conditions will be maintained. Failure to do this may cause slight differences in the residual history.

Last updated 23 June 2005