### Abstract

Experimental and numerical results from an investigation of compressible, turbulent shear layers are presented. In particular, the issues of compressibility and mixing in these flows are addressed. Two-component laser Doppler velocimeter (LDV) measurements reveal that the transverse turbulence intensity and normalized Reynolds shear stress decrease with increasing relative Mach number (compressibility), while the Reynolds stress correlation coefficient remains constant and the anisotropy increases. Two-dimensional digital images of Mie scattering signals demonstrate that large-scale, organized structures occur less frequently and are less well defined at high relative Mach numbers. Statistical processing of these images suggests that a preferred mixed fluid concentration does not occur in the shear layer under the current conditions. A new one-equation algebraic stress turbulence model with improved pressure-strain modeling is presented that accounts for variations in the anisotropy of the normal stresses. Results from the proposed model agree well with the detailed LDV data. In addition, transport modeling of a passive scalar is considered, with special emphasis given to modeling the unmixedness.

Original language | English (US) |
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Title of host publication | Preprints for the Symposium on Turbulence |

Editors | X.B.Jr. Reed, G.K. Patterson, J.L. Zakin |

Publisher | Publ by Univ of Missouri |

State | Published - 1990 |

Event | Twelfth Turbulence Symposium - Rolla, MS, USA Duration: Sep 24 1990 → Sep 26 1990 |

### Other

Other | Twelfth Turbulence Symposium |
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City | Rolla, MS, USA |

Period | 9/24/90 → 9/26/90 |

### Fingerprint

### ASJC Scopus subject areas

- Engineering(all)

### Cite this

*Preprints for the Symposium on Turbulence*Publ by Univ of Missouri.

**Compressibility and mixing in turbulent free shear layers.** / Dutton, J Craig; Burr, R. F.; Goebel, S. G.; Messersmith, N. L.

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

*Preprints for the Symposium on Turbulence.*Publ by Univ of Missouri, Twelfth Turbulence Symposium, Rolla, MS, USA, 9/24/90.

}

TY - GEN

T1 - Compressibility and mixing in turbulent free shear layers

AU - Dutton, J Craig

AU - Burr, R. F.

AU - Goebel, S. G.

AU - Messersmith, N. L.

PY - 1990

Y1 - 1990

N2 - Experimental and numerical results from an investigation of compressible, turbulent shear layers are presented. In particular, the issues of compressibility and mixing in these flows are addressed. Two-component laser Doppler velocimeter (LDV) measurements reveal that the transverse turbulence intensity and normalized Reynolds shear stress decrease with increasing relative Mach number (compressibility), while the Reynolds stress correlation coefficient remains constant and the anisotropy increases. Two-dimensional digital images of Mie scattering signals demonstrate that large-scale, organized structures occur less frequently and are less well defined at high relative Mach numbers. Statistical processing of these images suggests that a preferred mixed fluid concentration does not occur in the shear layer under the current conditions. A new one-equation algebraic stress turbulence model with improved pressure-strain modeling is presented that accounts for variations in the anisotropy of the normal stresses. Results from the proposed model agree well with the detailed LDV data. In addition, transport modeling of a passive scalar is considered, with special emphasis given to modeling the unmixedness.

AB - Experimental and numerical results from an investigation of compressible, turbulent shear layers are presented. In particular, the issues of compressibility and mixing in these flows are addressed. Two-component laser Doppler velocimeter (LDV) measurements reveal that the transverse turbulence intensity and normalized Reynolds shear stress decrease with increasing relative Mach number (compressibility), while the Reynolds stress correlation coefficient remains constant and the anisotropy increases. Two-dimensional digital images of Mie scattering signals demonstrate that large-scale, organized structures occur less frequently and are less well defined at high relative Mach numbers. Statistical processing of these images suggests that a preferred mixed fluid concentration does not occur in the shear layer under the current conditions. A new one-equation algebraic stress turbulence model with improved pressure-strain modeling is presented that accounts for variations in the anisotropy of the normal stresses. Results from the proposed model agree well with the detailed LDV data. In addition, transport modeling of a passive scalar is considered, with special emphasis given to modeling the unmixedness.

UR - http://www.scopus.com/inward/record.url?scp=0025565341&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0025565341&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:0025565341

BT - Preprints for the Symposium on Turbulence

A2 - Reed, X.B.Jr.

A2 - Patterson, G.K.

A2 - Zakin, J.L.

PB - Publ by Univ of Missouri

ER -