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Energy Events in the Atmospheric Boundary Layer

  • Roddam Narasimha
  • Sudarsh V. Kailas

Summary

Turbulent velocity fluctuations in the atmospheric boundary layer are analysed using the VITA technique, with a view to understand the relation of the special events detected by the technique with turbulent bursts at high Reynolds numbers. Utilising data acquired under conditions of neutral stability at the Boulder Atmospheric Observatory, it is found that the “energy events” so detected are qualitatively similar in many respects to the turbulent bursts observed at much lower Reynolds numbers in the laboratory, but last longer and occur less frequently, in a manner not inconsistent with outer scaling. It is concluded that high Reynolds number flows reveal bursts tending to scale on outer variables — a conclusion that is considered particularly significant as wall parameters are of the same order in the atmospheric boundary layer as in the laboratory flows that have been widely studied.

Keywords

Boundary Layer Turbulent Boundary Layer Atmospheric Boundary Layer Energy Event Conditional Average 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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References

  1. /1/.
    Blackwelder, R.F.; Kaplan, R.E.: On the wall structure of the turbulent boundary layer. J. Fluid Mech. (1976) 76: 89–112.CrossRefADSGoogle Scholar
  2. /2/.
    Blackwelder, R.F.; Haritonidis, J.H.: Scaling of the bursting frequency in turbulent boundary layers. J. Fluid Mech. (1983) 132: 87–104.CrossRefADSGoogle Scholar
  3. /3/.
    Cantwell, B.J.: Organised motion in turbulent flow. Ann. Rev. Fluid Mech. (1981) 13: 457–515.CrossRefADSGoogle Scholar
  4. /4/.
    Gordon, C.M.: Intermittent momentum transport in a geo- physical boundary layer. Nature (1974) 248: 392–393.CrossRefADSGoogle Scholar
  5. /5/.
    Gordon, C.M.: Period between bursts at high Reynolds number. Phys. Fluids (1975) 18: 141.CrossRefADSGoogle Scholar
  6. /6/.
    Grass, A.J.: Structural features of turbulent flow over smooth and rough boundaries. J. Fluid Mech. (1971) 50: 233–255.CrossRefADSGoogle Scholar
  7. /7/.
    Heathershaw, A.D.: Bursting phenomena in the sea. Nature (1974) 248: 394–395.CrossRefADSGoogle Scholar
  8. /8/.
    Jackson, R.G.: Sedimentological and fluid-dynamic implications of the turbulent bursting phenomenon in geophysical flows. J. Fluid Mech. (1976) 77: 531–560.CrossRefMATHADSGoogle Scholar
  9. /9/.
    Johansson, A.V.; Alfredsson P.H.: On the structure of turbulent channel flow. J. Fluid Mech. (1982) 122: 295–314.CrossRefADSGoogle Scholar
  10. /10/.
    Kaimal, J.C.; Gaynor, J.E.: Boulder Atmospheric Observatory. J. Appl. Met. (1983) 22: 863–880.CrossRefADSGoogle Scholar
  11. /11/.
    Kline, S.J.; Reynolds, W.C.; Schraub, F.A.; Runstadler, P.W.: The structure of turbulent boundary layers. J. Fluid Mech. (1967) 30: 741–773.CrossRefADSGoogle Scholar
  12. /12/.
    Lu, S.S.; Willmarth, W.W.: Measurements of the structure of the Reynolds stress in a turbulent boundary layer. J. Fluid Mech. (1973) 60: 481–511.CrossRefADSGoogle Scholar
  13. /13/.
    Narasimha, R.: Comments on Blackwelder & Haritonidis - Scaling of the bursting frequency in turbulent boundary layers (1983).Google Scholar
  14. /14/.
    Narasimha, R.; Kailas, S.V.: Energy events in the atmospheric boundary layer. Report 86 AS 8, Indian Inst. Sci. (1986).Google Scholar
  15. /15/.
    Offen, C.R.; Kline, S.J.: Combined dye-streak and hydrogen-bubble visual observations of a turbulent boundary layer. J. Fluid Mech. (1974) 62: 223–239.CrossRefADSGoogle Scholar
  16. /16/.
    Panofsky, H.A.; Dutton, J.A.: Atmospheric turbulence: Models and methods for enginering applications. Wiley Inter-Science Publications, New York (1984).Google Scholar
  17. /17/.
    Rajagopalan, S.; Antonia, R.A.: Conditional averages associated with the fine structure in a turbulent boundary layer. Phys. Fluids (1984) 27: 1966.CrossRefADSGoogle Scholar
  18. /18/.
    Rao, K.N.; Narasimha, R.; Narayanan, M.A.B.: The ‘bursting’ phenomenon in a turbulent boundary-lyer. J. Fluid Mech. (1971) 48: 339–352.CrossRefADSGoogle Scholar
  19. /19/.
    Shah, D.A.; Chambers, A.J.; Antonia, R.A.: Report TN FM 83/7, Dept. Mech. Engg., University of Newcastle (1983).Google Scholar
  20. /20/.
    Thomas, A.S.W.: Some observations of the structure of the turbulent boundary layer. AGARD CP271. Paper 26 (1977).Google Scholar
  21. /21/.
    Tu, B.J.; Willmarth, W.W.: An experimental study of turbulence near the wall through correlation measurements in a thick turbulent boundary layer. Report 02920–3-T, Dept. Aerospace Engg., Uni. Mich. College Engg., Ann Arbor (1966).Google Scholar
  22. /22/.
    Ueda, H.; Hinze, J.O.: Fine-structure turbulence in the wall region of a turbulent boundary layer. J. Fluid Mech. (1975) 67: 125–143.CrossRefADSGoogle Scholar
  23. /23/.
    Willmarth, W.W.: Structure of turbulence in boundary layers. Adv. Appl. Mech. (1975) 15: 159.CrossRefADSGoogle Scholar

Copyright information

© Springer-Verlag Berlin, Heidelberg 1987

Authors and Affiliations

  • Roddam Narasimha
    • 1
  • Sudarsh V. Kailas
    • 2
  1. 1.National Aeronautical LaboratoryBangaloreIndia
  2. 2.Indian Institute of ScienceBangaloreIndia

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