Baldwin - Lomax algebraic model
The Baldwin-Lomax model (Baldwin and Lomax (1978), ) is a two-layer algebraic which gives the eddy viscosity as a function of the local boundary layer velocity profile. The model is suitable for high-speed flows with thin attached boundary-layers, typically present in aerospace and turbomachinery applications. It is commonly used in quick design iterations where robustness is more important than capturing all details of the flow physics. The Baldwin-Lomax model is not suitable for cases with large separated regions and significant curvature/rotation effects.
where is the smallest distance from the surface where is equal to : 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.