The intermediate wake of a body of revolution at high Reynolds numbers

Results are presented on the flow field downstream of a body of revolution for Reynolds numbers based on a model length ranging from 1.1 × 106 to 67 × 106. The maximum Reynolds number is more than an order of magnitude larger than that obtained in previous laboratory wake studies. Measurements are taken in the intermediate wake at locations 3, 6, 9, 12 and 15 diameters downstream from the stern in the midline plane. The model is based on an idealized submarine shape (DARPA SUBOFF), and it is mounted in a wind tunnel on a support shaped like a semi-infinite sail. The mean velocity distributions on the side opposite the support demonstrate self-similarity at all locations and Reynolds numbers, whereas the mean velocity distribution on the side of the support displays significant effects of the support wake. None of the Reynolds stress distributions of the flow attain self-similarity, and for all except the lowest Reynolds number, the support introduces a significant asymmetry into the wake which results in a decrease in the radial and streamwise turbulence intensities on the support side. The distributions continue to evolve with downstream position and Reynolds number, although a slow approach to the expected asymptotic behaviour is observed with increasing distance downstream.

[1]  W. George,et al.  The far downstream evolution of the high-Reynolds-number axisymmetric wake behind a disk. Part 2. Slice proper orthogonal decomposition , 2006, Journal of Fluid Mechanics.

[2]  Serhat Hosder.  Unsteady Skin-Friction Measurements on a Maneuvering Darpa2 Suboff Model , 2001 .

[3]  V. C. Patel,et al.  The symmetric turbulent wake of a flat plate , 1982 .

[5]  T. Kubota,et al.  Axisymmetric wakes behind a slender body including zero-momentum configurations , 1990 .

[6]  The effects of fins on the intermediate wake of a submarine model , 2010 .

[7]  H. Fiedler,et al.  Structure and Mechanisms of Turbulence II , 1978 .

[8]  R. Chevray,et al.  The Turbulent Wake of a Body of Revolution , 1968 .

[9]  A. I. Sirviente,et al.  Experiments in the Turbulent Near Wake of an Axisymmetric Body , 1999 .

[10]  Hiroshi Sato,et al.  The mechanism of transition in the wake of a thin flat plate placed parallel to a uniform flow , 1961, Journal of Fluid Mechanics.

[11]  Laser Doppler velocimetry momentum defect measurements of cable drag at low to moderate Reynolds numbers: feasibility study , 1977 .

[12]  V. C. Patel,et al.  Measurements in the thick axisymmetric turbulent boundary layer near the tail of a body of revolution , 1974 .

[13]  A. Tsinober,et al.  Hot Wire Anemometry , 1995 .

[14]  Peter B. V. Johansson,et al.  The far downstream evolution of the high-Reynolds-number axisymmetric wake behind a disk. Part 1. Single-point statistics , 2006, Journal of Fluid Mechanics.

[15]  H. L. Liu,et al.  MEASUREMENTS OF FLOWS OVER AN AXISYMMETRIC BODY WITH VARIOUS APPENDAGES IN A WIND TUNNEL: THE DARPA SUBOFF EXPERIMENTAL PROGRAM , 1994 .

[16]  F. Clauser.  The Structure of Turbulent Shear Flow , 1957, Nature.

[17]  R. A. Merz,et al.  The subsonic near-wake of an axisymmetric semielliptical afterbody , 1985 .

[18]  Peter Bradshaw,et al.  An introduction to turbulence and its measurement , 1971 .

[19]  Thomas Carmody,et al.  Establishment of the Wake Behind a Disk , 1964 .

[20]  H Oertel,et al.  Wakes behind blunt bodies , 1990 .

[21]  I. Wygnanski,et al.  On the large-scale structures in two-dimensional, small-deficit, turbulent wakes , 1986, Journal of Fluid Mechanics.

[22]  Murray S. Korman,et al.  Fundamentals of hot wire anemometry , 1986 .

[23]  Juan Pablo Jimenez.  High Reynolds number flows about bodies of revolution with application to submarines and torpedoes , 2007 .

[24]  D. Bridges,et al.  Investigation of Scaling Effects in Submarine Flows , 2006 .

[25]  S. Goldstein,et al.  Low-Drag and Suction Airfoils , 1948 .

[26]  Chunhua Sheng,et al.  Multiblock multigrid solution of three-dimensional incompressible turbulent flows about appended submarine configurations , 1995 .

[27]  C. R. Symes,et al.  Effects of external turbulence upon the flow past cylinders , 1978 .

[28]  Chao-Ho Sung,et al.  Imcompressible flow computation of forces and moments on bodies of revolution at incidence , 1993 .

[29]  S. Yavuzkurt.  A Guide to Uncertainty Analysis of Hot-Wire Data , 1984 .