Abstract
A thermodynamic approach to the boundary layer flow system is used to investigate the control rule underlying the flow field. Application of Pontryagin's Maximum Principle from control theory shows minimum rate of entropy production to be the control rule for the flow field, in common with other dissipative processes. This result is used to investigate possible organised motion in the turbulent boundary layer and the generation of longitudinal vortices which is known to be an intrinsic characteristic of turbulence.
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