The boundary layer behind a shock or thin expansion wave advancing into a stationary fluid has been determined. Laminar and turbulent boundary layers were considered. The wall surface temperature behind the wave was also investigated. The assumption of a thin expansion wave is valid for weak expansions but becomes progressively less accurate for strong expansion wavesnThe laminar-boundary-layer problem was solved by numerical integration except for the weak wave case, which can be solved analytically. Integral (Karman-Pohlhausen type} solutions were also obtained to provide a guide for determining expressions which accurately represent the numerical data. Analytical expressions for various boundary-layer parameters are presented which agree with the numerical integrations within 1 percent.
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