Hostname: page-component-745bb68f8f-grxwn Total loading time: 0 Render date: 2025-01-09T04:56:12.063Z Has data issue: false hasContentIssue false
  • English
  • Français

Local effects of large-scale eddies on bursting in a concave boundary layer

Published online by Cambridge University Press:  21 April 2006

Robert S. Barlow  and
James P. Johnston
Robert S. Barlow
Affiliation:
Combustion Research Facility, Sandia National Laboratories, Livermore, CA 94550, USA
James P. Johnston
Affiliation:
Combustion Research Facility, Sandia National Laboratories, Livermore, CA 94550, USA
Get access Rights & Permissions [Opens in a new window]

Abstract

Concave curvature has a destabilizing effect on a turbulent boundary layer that causes the formation of large-scale inflow and outflow regions. These structures are larger and more energetic than large eddies in a flat boundary layer, particularly in terms of velocity fluctuations normal to the wall. Flow visualization has suggested that the large-scale inflows and outflows have a strong influence on turbulence structure in the near-wall region. However, near-wall profiles of Reynolds-averaged quantities in the concave boundary layer do not indicate major structural changes. In this paper, the effects of concave curvature on near-wall structure are investigated in two flow cases: (i) the natural concave boundary layer, where the large-scale eddies do not have preferred spanwise locations and the layer remains nearly two-dimensional in the means; and (ii) a case in which vortex generators are used to induce a fixed array of longitudinal roll cells, allowing measurements to be made under stationary inflow and outflow regions. Burst frequencies obtained using an extension of the uv-quadrant method confirm the visual impression that inflows suppress the bursting process, while outflows enhance it. Reynolds-averaged measurements show that turbulence intensity and the uv correlation coefficient are also suppressed under the inflows. Based on these results, a conceptual model for the effects of large-scale eddies on near-wall flow and skin friction in a concave layer is proposed.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 191 , June 1988 , pp. 177 - 195
Copyright
© 1988 Cambridge University Press

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Barlow, R. S. & Johnston, J. P. 1985 Structure of turbulent boundary layers on a concave surface. Rept. MD-47, Thermosciences Div., Dept. of Mech. Engng. Stanford University.
Barlow, R. S. & Johnston, J. P. 1988 Structure of a turbulent boundary layer on a concave surface. J. Fluid Mech. 191, 137.Google Scholar
Blackwelder, R. F. & Kaplan, R. E. 1976 On the wall structure of the turbulent boundary layer. J. Fluid Mech. 76, 89.Google Scholar
Blackwelder, R. F. & Haritonidis, J. H. 1983 Scaling of burst frequencies in turbulent boundary layers. J. Fluid Mech. 132, 87.Google Scholar
Bogard, D. G. 1982 Investigation of burst structures in turbulent channel flows through simultaneous flow visualization and velocity measurements. PhD dissertation, Purdue University.
Bogard, D. G. & Tiederman, W. G. 1986 Burst detection with single-point velocity measurements. J. Fluid Mech. 162, 389.Google Scholar
Cantwell, B. J. 1981 Organized motion in turbulent flow. Ann. Rev. Fluid Mech. 13, 457.Google Scholar
Comte-Bellot, G., Sabot, J. & Saleh, I. 1978 Detection of intermittent events maintaining Reynolds stress. Proc. Dynamic Flow Conf. Dynamic Measurements in Unsteady Flows, p. 213. Marseille.
Corino, E. R. & Brodkey, R. S. 1969 A visual study of turbulent shear flow. J. Fluid Mech. 65, 1.Google Scholar
Hoffman, P. H., Muck, K. C. & Bradshaw, P. 1985 The effect of concave curvature on turbulent boundary layers. J. Fluid Mech. 161, 371.Google Scholar
Jeans, A. H. & Johnston, J. P. 1982 The effects of concave curvature on turbulent boundary-layer structure. Rept. MD-40, Thermosciences Div., Dept. of Mech. Engng. Stanford University.
Kim, J. 1983 On the structure of wall-bounded turbulent flows. Phys. Fluids 26, 52.Google Scholar
Kim, H. T., Kline, S. J. & Reynolds, W. C. 1971 The production of turbulence near a smooth wall in a turbulent boundary layer. J. Fluid Mech. 50, 133.Google Scholar
Kim, J. & Moin, P. 1985 The structure of the vorticity field in turbulent channel flow. J. Fluid Mech. 162, 339.Google Scholar
Kim, J., Moin, P. & Moser, R. 1987 Turbulence statistics in fully developed channel flow at low Reynolds number. Submitted to J. Fluid Mech.Google Scholar
Kline, S. J. 1978 The role of visualization in the study of the structure of the turbulent boundary layer. In Coherent Structure of Turbulent Boundary Layers (ed. C. R. Smith & D. E. Abbott). AFOSR/Lehigh University Workshop.
Kline, S. J., Reynolds, W. C., Schraub, F. A. & Runstadler, P. W. 1967 The structure of turbulent boundary layers. J. Fluid Mech. 30, 741.Google Scholar
Kline, S. J. & Runstadler, P. W. 1959 Some preliminary results of visual studies of the wall layers of the turbulent boundary layer. Trans. ASME E: J. Appl. Mech. 81, 166.Google Scholar
Luchik, T. S. & Tiederman, W. C. 1987 Timescale and structure of ejections and bursts in turbulent channel flow. J. Fluid Mech. 174, 529.Google Scholar
Moin, P. & Kim, J. 1982 Numerical investigation of turbulent channel flow. J. Fluid Mech. 118, 341.Google Scholar
Moin, P. & Kim, J. 1985 The structure of the vorticity field in turbulent channel flow. Part 1. Analysis of instantaneous fields and statistical correlations. J. Fluid Mech. 155, 441.Google Scholar
Offen, G. R. & Kline, S. J. 1975 A comparison and analysis of detection methods for the measurement of production in a boundary layer. Proc. 3rd Biennial Symposium on Turbulence in Liquids, Dept Chem. Engng, Univ. of Missouri, Rolla, p. 289.
Schraub, F. A. & Kline, S. J. 1965 A study of the structure of the turbulent boundary layer with and without longitudinal pressure gradients. Rept MD-12, Thermosciences Div., Dept Mech. Engng, Stanford University.
Simonich, J. C. & Moffat, R. J. 1982 Local measurements of turbulent boundary-layer heat transfer on a concave surface using liquid crystals. Rep. HMT-35, Thermosciences Div., Dept Mech. Engng, Stanford University.
Smith, C. R. 1984 A synthesized model of the near-wall behavior in turbulent boundary layers. Proc. Eighth Symposium on Turbulence (ed. G. K. Patterson & J. L. Zakin), Dept Chem. Engng, University of Missouri-Rolla.
Willmarth, W. W. 1975 Adv. Appl. Mech. 15, 159.
Willmarth, W. W. 1978 Survey of multiple sensor measurements and correlations in boundary layers. In Coherent Structure of Turbulent Boundary Layers (ed. C. R. Smith & D. E. Abbott), AFOSR/Lehigh University Workshop.