Boundary Layer Theory. Boundary Layer Theory book presents a comprehensive overview of boundary-layer theory and its application to all areas of fluid mechhanics, with emphasis on the flow past bodies (e.g. aircraft aerodynamics). It contains the latest knowledge of the subject based on a thorough review of the literature over the past 15 years.

The boundary layer thickness, δ, is defined as the distance required for the flow to nearly reach Ue. We might take an arbitrary number (say 99%) to define what we mean by "nearly", but certain other definitions are used most frequently. The displacement thickness and momentum thickness are alternative measures of boundary layer thickness and are used in the calculation of various boundary layer properties.

The approach to the solution of this equation is to assume that the pressure does not vary with y, so it is specified by the external velocity distribution. v is computed from the continuity equation, leaving a PDE in u to be integrated. However, this holds only for laminar flow since turbulent boundary layers are inherently unsteady. Subsequent sections deal with the solution of these equations in more detail.


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