TY - JOUR

T1 - Large-scale and very-large-scale motions in turbulent pipe flow

AU - Guala, M.

AU - Hommema, S. E.

AU - Adrian, Ronald

PY - 2006/5/1

Y1 - 2006/5/1

N2 - In the outer region of fully developed turbulent pipe flow very large-scale motions reach wavelengths more than 8R-16R long (where R is the pipe radius), and large-scale motions with wavelengths of 2R-3R occur throughout the layer. The very-large-scale motions are energetic, typically containing half of the turbulent kinetic energy of the streamwise component, and they are unexpectedly active, typically containing more than half of the Reynolds shear stress. The spectra of the y-derivatives of the Reynolds shear stress show that the very-large-scale motions contribute about the same amount to the net Reynolds shear force, d - u′v′/dy, as the combination of all smaller motions, including the large-scale motions and the main turbulent motions. The main turbulent motions, defined as the motions small enough to be in a statistical equilibrium (and hence smaller than the large-scale motions) contribute relatively little to the Reynolds shear stress, but they constitute over half of the net Reynolds shear force.

AB - In the outer region of fully developed turbulent pipe flow very large-scale motions reach wavelengths more than 8R-16R long (where R is the pipe radius), and large-scale motions with wavelengths of 2R-3R occur throughout the layer. The very-large-scale motions are energetic, typically containing half of the turbulent kinetic energy of the streamwise component, and they are unexpectedly active, typically containing more than half of the Reynolds shear stress. The spectra of the y-derivatives of the Reynolds shear stress show that the very-large-scale motions contribute about the same amount to the net Reynolds shear force, d - u′v′/dy, as the combination of all smaller motions, including the large-scale motions and the main turbulent motions. The main turbulent motions, defined as the motions small enough to be in a statistical equilibrium (and hence smaller than the large-scale motions) contribute relatively little to the Reynolds shear stress, but they constitute over half of the net Reynolds shear force.

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U2 - 10.1017/S0022112006008871

DO - 10.1017/S0022112006008871

M3 - Article

AN - SCOPUS:33646026444

VL - 554

SP - 521

EP - 542

JO - Journal of Fluid Mechanics

JF - Journal of Fluid Mechanics

SN - 0022-1120

ER -