Abstract

Possibility of occurrence of secondary flow in boundary layer around a circular cylinder in rotatory oscillation is studied by means of linear theory. The secondary flow can occur above a certain critical Reynolds number, and the condition of occurrence of the secondary flow is shown by curves in the Reynolds and wave number diagrams with a nondimensional thickness of the boundary layer as a parameter. Satisfactory agreement of the results with experimental ones by Taneda et al. is obtained.

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