The Baldwin-Lomax model is a two-layer algebraic model which gives the eddy-viscosity as a function of the local boundary layer velocity profile:
Where is the smallest distance from the surface where is equal to :
The inner region is given by the Prandtl - Van Driest formula:
The outer region is given by:
and are determined from the maximum of the function:
is the intermittency factor given by:
is the difference between maximum and minimum speed in the profile. For boundary layers the minimum is always set to zero.
The table below gives the model constants present in the formulas above. Note that is a constant, and not the turbulence energy, as in other sections. It should also be pointed out that when using the Baldwin-Lomax model the turbulence energy, , present in the governing equations, is set to zero.
- Thin Layer Approximation and Algebraic Model for Separated Turbulent Flows by B. S. Baldwin and H. Lomax, AIAA Paper 78-257, 1978