Hostname: page-component-cd9895bd7-lnqnp Total loading time: 0 Render date: 2024-12-28T21:45:24.028Z Has data issue: false hasContentIssue false
  • English
  • Français

Ventilated oscillatory boundary layers

Published online by Cambridge University Press:  26 April 2006

Daniel C. Conley  and
Douglas L. Inman
Daniel C. Conley
Affiliation:
Center for Coastal Studies, Scripps Institution of Oceanography, University of California at San Diego, La Jolla, CA 92093-0209, USA Present address: Marine Sciences Research Center, State University of New York, Stony Brook, NY 11794–5000, USA.
Douglas L. Inman
Affiliation:
Center for Coastal Studies, Scripps Institution of Oceanography, University of California at San Diego, La Jolla, CA 92093-0209, USA
Get access Rights & Permissions [Opens in a new window]

Abstract

Boundary layers arising from flows which oscillate parallel to a permeable bed, and are subject to oscillating percolation of the same frequency as the bed parallel flow, referred to here as ‘ventilated oscillatory boundary layers’, are the subject of this laboratory study. These boundary layers are intended to approximate naturally occurring wave boundary layers over permeable beds. Measurements of boundary-layer velocities, bed stress and turbulent flow properties are presented. It is observed that suction (flow into the bed) enhances the near-bed velocities and bed stress while injection (flow out of the bed) leads to a reduction in these quantities. As the ventilated oscillatory boundary layer experiences both these phenomenon in one full cycle, the result is a net stress and a net boundary-layer velocity in an otherwise symmetric flow. While production of turbulence attributable to injection is enhanced, the finite time required for this to occur leads to a greater vertically averaged turbulence in the suction half-cycle. Turbulence generated in the suction half-cycle is maintained in a compact layer much closer to the bed. These effects appear to hold for $\widetilde{Re}$ ranging from 105 to 106 and for oscillations other than sinusoidal.

Type
Research Article
Information
Journal of Fluid Mechanics , Volume 273 , 25 August 1994 , pp. 261 - 284
Copyright
© 1994 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

Antonia, R. A., Bisset, D. K., Fulachier, L. & Anselmet, F. 1990 Effect of wall suction on bursting in a turbulent boundary layer. Phys. Fluids A 2, 1241–1247.Google Scholar
Antonia, R. A., Fulachier, L., Krishnamoorthy, L. V., Benabid, T. & Anselmet, F. 1988 Influence of wall suction on the organized motion in a turbulent boundary layer. J. Fluid Mech. 190, 217–240.Google Scholar
Blinco, P. H. & Sandborn, V. A. 1975 Use of the split-film sensor to measure turbulence in water near a wall. In Turbulence in Liquids (ed. G. K. Patterson & J. L. Zakin), pp. 403–413. Dept. Chemical Engineering, University of Missouri-Rolla.
Conley, D. C. & Inman, D. L. 1992 Field observations of the fluid-granular boundary layer under near-breaking waves. J. Geophys. Res. 97 (C6), 9631–9643.Google Scholar
Elgar, S. & Guza, R. T. 1985 Observation of bispectra of shoaling surface gravity waves. J. Fluid Mech. 161, 425–448.Google Scholar
Flick, R. E. & George, R. A. 1990 Turbulence scales in the surf and swash. Proc. 22nd Conf. on Coastal Engng, pp. 557–569. ASCE.
Flick, R. E., Guza, R. T. & Inman, D. L. 1981 Elevation and velocity measurements of laboratory shoaling waves. J. Geophys. Res. 86 (C5), 4149–4160.Google Scholar
Fulachier, L., Elena, M., Verollet, E. & Dumas, R. 1982 Suction effects on the structure of turbulent boundary layer on a heated porous wall. In Structure of Turbulence in Heat and Mass Transfer (ed. Z. P. Zorac), pp. 193–220. Hemisphere.
Grant, W. D. & Madsen, O. S. 1979 Combined wave and current interaction with a rough bottom. J. Geophys. Res. 84 (C4), 1797–1808.Google Scholar
Hanes, D. M. & Huntley, D. A. 1986 Continuous measurements of suspended sand concentration in a wave dominated nearshore environment. Cont. Shelf Res. 6, 585–596.Google Scholar
Hasselmann, K., Munk, W. & MacDonald, G. 1963 Bispectra of Ocean waves. In Time Series Analysis (ed. M. Rosenblatt), pp. 125–139. John Wiley.
Jensen, B. L., Sumer, B. M. & Fredsoe, J. 1989 Turbulent oscillatory boundary layers at high Reynolds numbers. J. Fluid Mech. 206, 265–297.Google Scholar
Jonsson, I. G. 1963 Measurements in the turbulent wave boundary layer. Proc. 10th Congr. IAHR, pp. 85–92.
Justesen, P. 1987 Turbulent wave boundary layers. Series Paper 43. Inst. Hydrodyn. and Hydraul. Eng., Tech. Univ. of Denmark, Lyngby.
Kays, W. M. 1972 Heat transfer to the transpired turbulent boundary layer. Intl J. Heat Mass Transfer 15, 1023–1044.Google Scholar
King, D. B., Powell, J. D. & Seymour, R. J. 1984 A new oscillatory flow tunnel for use in sediment transport experiments. Proc. 19th Conf. Coastal Engng, pp. 1559–1570. ASCE.
Libby, P. A., Kaufman, L. & Harrington, R. P. 1952 An experimental investigation of the isothermal laminar boundary layer on a porous flat plate. J. Aero. Sci. X, 127–134.Google Scholar
Liu, P. L.-F. 1977 Mass transport in water waves propagated over a permeable bed. Coastal Engng 1, 79–96.Google Scholar
Lofquist, K. E. B. 1975 An effect of permeability on sand transport by waves. Tech. Memo. 62. US Army Corps of Engrs, Coastal Engng Res. Center.
Mickley, H. S. & Davis, R. S. 1957 Momentum transfer for flow over a flat plate with blowing. Tech. Note 4017. Natl Adv. Comm. Aeronaut., Washington.
Mickley, H. S., Ross, R. C., Squyers, A. L. & Stewart, W. E. 1954 Heat, mass, and momentum transfer over a flat plate with blowing or suction. Tech. Note 3208. Natl Adv. Comm. Aeronaut., Washington.
Reid, R. O. & Kajiura, K. 1957 On the damping of gravity waves over a permeable sea bed. EOS, Trans. AGU 38, 662–666.Google Scholar
Schlichting, H. 1979 Boundary Layer Theory, 7th edn. McGraw-Hill.
Simpson, R. L., Moffat, R. J. & Kays, W. M. 1969 The turbulent boundary layer on a porous plate: Experimental skin friction with variable injection and suction. Intl J. Heat Mass Transfer 12, 771–789.Google Scholar
Sleath, J. F. A. 1978 Mass transport in water waves propagated over a permeable bed (Liu, 1977). Coastal Engng 2, 169–171.Google Scholar
Sleath, J. F. A. 1987 Turbulent oscillatory flow over rough beds. J. Fluid Mech. 182, 369–409.Google Scholar
Tewfik, O. E. 1963 Some characteristics of the turbulent boundary layer with air injection. AIAA J. 1, 1306–1312.Google Scholar