### 19.2.1. Units Commonly Used in CFX

CFX-Pre provides you with a choice of several commonly used units to ease the task of specifying quantities and converting results.

The full list of quantities where commonly used units are available is given in the following table:

Quantity | Commonly used units
--- | ---
Velocity | [m s^-1] [km hr^-1] [mile hr^-1] [ft s^-1, knot]
Volumetric Flow | [m^3 s^-1] [litre s^-1] [gallon hr^-1] [gallonUSliquid hr^-1]
Mass Flow | [kg s^-1] [tonne s^-1] [lb s^-1]
k (turbulence kinetic energy) | [m^2 s^-2] [J kg^-1]
Epsilon (turbulence dissipation rate) | [m^2 s^-3] [J kg^-1 s^-1]

Pressure

[Pa]

[N m^-2]

[bar]

[torr]

[mm Hg]

[psi]

[psf]

Concentration | [m^-3] [litre^-1] [foot^-3]

Dynamic Viscosity

[kg m^-1 s^-1]

[centipoise]

[g cm^-1 s^-1]

[N s m^-2]

[Pa s]

[dyne s cm^-2]

[lb ft^-1 hr^-1]

[lbf s ft^-2]

Thermal Conductivity | [W m^-1 K^-1] [cal cm^-1 s^-1 K^-1] [BTU (ft^2 s (F/ft))^-1] [BTU (ft^2 hr (F/ft))^-1]
Specific Heat Capacity | [J kg^-1 K^-1] [cal g^-1 K^-1] [J g^-1 K^-1] [BTU lb^-1 F^-1]
Thermal Expansivity | [K^-1]
Kinematic Diffusivity | [m^2 s^-1] [cm^2 s^-1]
Acceleration | [m s^-2] [ft s^-2]
Temperature | [K] [C] [R] [F]
Density | [kg m^-3] [g cm^-3] [lb ft^-3]
Mass Concentration | [kg m^-3] [g l^-1]
Mass Fraction | [kg kg^-1] [g kg^-1]
Length | [m] [mm] [foot] [in]
Mass Flow in | [kg s^-1] [tonne s^-1] [lb s^-1]
Volumetric Flow in | [m^3 s^-1] [litre s^-1] [gallon hr^-1] [gallonUSliquid hr^-1]
Heat Transfer Coefficient | [W m^-2 K^-1]
Heat Flux in | [W m^-2]
Time | [s] [min] [hr]
Shear Strain rate | [s^-1]
Energy Source | [W m^-3] [kg m^-1 s^-3]
Energy Source Coefficient | [W m-^3 K^-1] [kg m^-1 s^-3 K^-1]
Momentum Source | [kg m^-2 s^-2]
Momentum Source Lin. Coeff. | [kg m^-3 s]
Momentum Source Quad. Coeff. | [kg m^-4]
Per Time | [s^-1]
Angle | [radian] [degree]
Angular Velocity | [radian s^-1] [rev min^-1]
Specific Enthalpy | [J kg^-1] [m^2 s^-2]
Energy | [J]

Release 18.2 - © ANSYS, Inc. All rights reserved.