### Abstract

A systematic study of two-dimensional, turbulent, small-deficit wakes was carried out to determine their structure and the universality of their self-preserving states. Various wake generators, including circular cylinders, a symmetrical airfoil, a flat plate, and an assortment of screens of varying solidity, were studied for a wide range of downstream distances. The results indicate that the normalized characteristic velocity and length scales depend on the initial conditions, while the shape of the normalized mean velocity profile is independent of these conditions or the nature of the generator. The normalized distributions of the longitudinal turbulence intensity, however, are dependent on the initial conditions. Linear inviscid stability theory, in which the divergence of the mean flow is taken into account, predicts quite well the amplification and the transverse distributions of amplitudes and phases of externally imposed sinuous waves on a fully developed turbulent wake generated by a flat plate.

Original language | English (US) |
---|---|

Pages (from-to) | 31-71 |

Number of pages | 41 |

Journal | Journal of Fluid Mechanics |

Volume | 168 |

State | Published - Jul 1986 |

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### ASJC Scopus subject areas

- Computational Mechanics
- Mechanics of Materials
- Physics and Astronomy(all)
- Condensed Matter Physics

### Cite this

*Journal of Fluid Mechanics*,

*168*, 31-71.

**ON THE LARGE-SCALE STRUCTURES IN TWO-DIMENSIONAL, SMALL-DEFICIT, TURBULENT WAKES.** / Wygnanski, Israel J; Champagne, F.; Marasli, B.

Research output: Contribution to journal › Article

*Journal of Fluid Mechanics*, vol. 168, pp. 31-71.

}

TY - JOUR

T1 - ON THE LARGE-SCALE STRUCTURES IN TWO-DIMENSIONAL, SMALL-DEFICIT, TURBULENT WAKES.

AU - Wygnanski, Israel J

AU - Champagne, F.

AU - Marasli, B.

PY - 1986/7

Y1 - 1986/7

N2 - A systematic study of two-dimensional, turbulent, small-deficit wakes was carried out to determine their structure and the universality of their self-preserving states. Various wake generators, including circular cylinders, a symmetrical airfoil, a flat plate, and an assortment of screens of varying solidity, were studied for a wide range of downstream distances. The results indicate that the normalized characteristic velocity and length scales depend on the initial conditions, while the shape of the normalized mean velocity profile is independent of these conditions or the nature of the generator. The normalized distributions of the longitudinal turbulence intensity, however, are dependent on the initial conditions. Linear inviscid stability theory, in which the divergence of the mean flow is taken into account, predicts quite well the amplification and the transverse distributions of amplitudes and phases of externally imposed sinuous waves on a fully developed turbulent wake generated by a flat plate.

AB - A systematic study of two-dimensional, turbulent, small-deficit wakes was carried out to determine their structure and the universality of their self-preserving states. Various wake generators, including circular cylinders, a symmetrical airfoil, a flat plate, and an assortment of screens of varying solidity, were studied for a wide range of downstream distances. The results indicate that the normalized characteristic velocity and length scales depend on the initial conditions, while the shape of the normalized mean velocity profile is independent of these conditions or the nature of the generator. The normalized distributions of the longitudinal turbulence intensity, however, are dependent on the initial conditions. Linear inviscid stability theory, in which the divergence of the mean flow is taken into account, predicts quite well the amplification and the transverse distributions of amplitudes and phases of externally imposed sinuous waves on a fully developed turbulent wake generated by a flat plate.

UR - http://www.scopus.com/inward/record.url?scp=0022755963&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0022755963&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0022755963

VL - 168

SP - 31

EP - 71

JO - Journal of Fluid Mechanics

JF - Journal of Fluid Mechanics

SN - 0022-1120

ER -