 This may be referred to as the "Spalart–Allmaras variable".The turbulent eddy viscosity is given by

The rotation tensor is given by
where d is the distance from the closest surface and formula_10 is the norm of the difference between the velocity at the trip (usually zero) and that at the field point we are considering.The constants are

According to Spalart it is safer to use the following values for the last two constants