High-resolution skin friction fields in separated flows on a low-aspect-ratio rectangular wing are obtained by using quantitative global skin friction diagnostics based on surface luminescent oil visualizations. The topological features like the isolated singular points and the boundary switch points in regions enclosed by penetrable boundaries are identified. The conservation law given by the Poincare–Bendixson index formula for the numbers of the isolated singular points and the boundary switch points is used as a general approach to analyze the topological structure of a skin friction field in a singly connected region enclosed by a penetrable boundary in the separated flows.
Experiments in Fluids – Springer Journals
Published: Jul 26, 2011
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