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On the rate of spatial predictability in near-wall turbulence

Published online by Cambridge University Press:  16 October 2008

NIKOLAY NIKITIN
NIKOLAY NIKITIN*
Affiliation:
Institute of Mechanics, Moscow State University, 1 Michurinsky Prospect, 119899 Moscow, Russia
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Abstract

Spatial evolution of small perturbations introduced into an inlet cross-section of fully developed turbulent flow in a long straight circular pipe is investigated via direct numerical simulation (DNS). The turbulent inflow field is extracted from an auxiliary streamwise-periodic simulation running in parallel with the main spatial simulation. It is shown that mean perturbation amplitude ϵ increases exponentially with distance downstream. The growth rate is found to be constant when normalized by viscous length, ϵ ~ exp(0.0021x+) over the considered Reynolds-number range 140 ≤ Reτ ≤ 320. The universal character of perturbation growth is confirmed by channel-flow simulations.

Type
Papers
Information
Journal of Fluid Mechanics , Volume 614 , 10 November 2008 , pp. 495 - 507
Copyright
Copyright © Cambridge University Press 2008

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