Author:
QUADRIO MAURIZIO,SIBILLA STEFANO
Abstract
The turbulent flow in a cylindrical pipe oscillating around its longitudinal axis is
studied via direct numerical solution of the Navier–Stokes equations, and compared
to the reference turbulent flow in a fixed pipe and in a pipe with steady rotation. The
maximum amount of drag reduction achievable with appropriate oscillations of the
pipe wall is found to be of the order of 40%, hence comparable to that of similar
flows in planar geometry. The transverse shear layer due to the oscillations induces
substantial modifications to the turbulence statistics in the near-wall region, indicating
a strong effect on the vortical structures. These modifications are illustrated, together
with the implications for the drag-reducing mechanism. A conceptual model of the
interaction between the moving wall and a streamwise vortex is discussed.
Publisher
Cambridge University Press (CUP)
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics
Cited by
95 articles.
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