### Abstract

In 1967 J. L. Lumley proposed two different, but complimentary approaches to the objective determination of coherent structures. The first uses an orthogonal decomposition to extract eigenvectors from two point velocity measurements, the lowest order eigenvector representing the largest structure. Where there are partial homogeneities, or when the flow is stationary, the eigenfunctions are the harmonic ones and the coherent features are impossible to identify. To organize these fluctuating Fourier modes into coherent features, a second decomposition is used, the shot-noise decomposition. The initial experiment (on which this paper is based) has generated cross-spectral data at seven radial positions across the jet mixing layer. The results to date show clearly the existence of a large scale structure in the mixing layer containing 40% of the turbulent energy. The second and third order structures contain another 40% of the energy. Thus nearly all the energy is contained in the first three modes.

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

Title of host publication | Unknown Host Publication Title |

State | Published - 1985 |

Externally published | Yes |

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### ASJC Scopus subject areas

- Engineering(all)

### Cite this

*Unknown Host Publication Title*

**COHERENT STRUCTURES IN THE AXISYMMETRIC TURBULENT JET MIXING LAYER.** / Glauser, Mark N; Leib, Stewart J.; George, William K.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

*Unknown Host Publication Title.*

}

TY - GEN

T1 - COHERENT STRUCTURES IN THE AXISYMMETRIC TURBULENT JET MIXING LAYER.

AU - Glauser, Mark N

AU - Leib, Stewart J.

AU - George, William K.

PY - 1985

Y1 - 1985

N2 - In 1967 J. L. Lumley proposed two different, but complimentary approaches to the objective determination of coherent structures. The first uses an orthogonal decomposition to extract eigenvectors from two point velocity measurements, the lowest order eigenvector representing the largest structure. Where there are partial homogeneities, or when the flow is stationary, the eigenfunctions are the harmonic ones and the coherent features are impossible to identify. To organize these fluctuating Fourier modes into coherent features, a second decomposition is used, the shot-noise decomposition. The initial experiment (on which this paper is based) has generated cross-spectral data at seven radial positions across the jet mixing layer. The results to date show clearly the existence of a large scale structure in the mixing layer containing 40% of the turbulent energy. The second and third order structures contain another 40% of the energy. Thus nearly all the energy is contained in the first three modes.

AB - In 1967 J. L. Lumley proposed two different, but complimentary approaches to the objective determination of coherent structures. The first uses an orthogonal decomposition to extract eigenvectors from two point velocity measurements, the lowest order eigenvector representing the largest structure. Where there are partial homogeneities, or when the flow is stationary, the eigenfunctions are the harmonic ones and the coherent features are impossible to identify. To organize these fluctuating Fourier modes into coherent features, a second decomposition is used, the shot-noise decomposition. The initial experiment (on which this paper is based) has generated cross-spectral data at seven radial positions across the jet mixing layer. The results to date show clearly the existence of a large scale structure in the mixing layer containing 40% of the turbulent energy. The second and third order structures contain another 40% of the energy. Thus nearly all the energy is contained in the first three modes.

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UR - http://www.scopus.com/inward/citedby.url?scp=17144438709&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:17144438709

BT - Unknown Host Publication Title

ER -