Skip to main content
SpringerLink
Log in
Book cover

Instability and Control of Massively Separated Flows pp 137–142Cite as

Open-Loop Control of a Turbulent Axisymmetric Wake

  • Conference paper
  • First Online:

  • 2059 Accesses

Part of the book series: Fluid Mechanics and Its Applications ((FMIA,volume 107))

Abstract

A high-frequency periodic jet, issuing parallel to the freestream from immediately below the point of separation, is used to force the turbulent wake of a bluff axisymmetric body. It is shown that, at the optimum jet forcing frequency and momentum flux coefficient, the time-averaged area-weighted base pressure increases by as much as 33 %. A detailed investigation of the effects of forcing is made using modal decomposition of pressure fluctuations on the base of the model and phase-locked two-component PIV. The high-frequency jet creates a row of closely spaced vortices, immediately adjacent to which are regions of large irrotational dissipation on each side. These shear layers inhibit the entrainment of fluid. The resulting pressure recovery is proportional to the strength of the vortices produced by the jet, and is accompanied by a broadband suppression of base pressure fluctuations associated with all modes. The optimum forcing frequency, at which amplification of the shear layer approaches unity gain, is roughly five times the shear-layer frequency.

This is a preview of subscription content, log in via an institution.

Chapter
USD   29.95
Price excludes VAT (USA)
  • Available as PDF
  • Read on any device
  • Instant download
  • Own it forever
eBook
USD   84.99
Price excludes VAT (USA)
  • Available as EPUB and PDF
  • Read on any device
  • Instant download
  • Own it forever
Softcover Book
USD   109.99
Price excludes VAT (USA)
  • Compact, lightweight edition
  • Dispatched in 3 to 5 business days
  • Free shipping worldwide - see info
Hardcover Book
USD   109.99
Price excludes VAT (USA)
  • Durable hardcover edition
  • Dispatched in 3 to 5 business days
  • Free shipping worldwide - see info

Tax calculation will be finalised at checkout

Purchases are for personal use only

Learn about institutional subscriptions

References

  1. Adrian RJ (1982) Comment on a note on Poisson’s equation for pressure in a turbulent flow. Phys Fluids 25:577

    Article  Google Scholar 

  2. Berger E, Scholz D, Schumm M (1990) Coherent vortex structures in the wake of a sphere and a circular disk at rest and under forced vibrations. J Fluids Struct 4:231–257

    Article  Google Scholar 

  3. Bradshaw P, Koh YM (1981) A note on Poisson’s equation for pressure in a turbulent flow. Phys Fluids 24:777

    Article  Google Scholar 

  4. Gaster M, Kit E, Wygnanski I (1985) Large-scale structures in a forced turbulent mixing layer. J Fluid Mech 150:23–39

    Article  Google Scholar 

  5. Glezer A, Amitay M (2002) Synthetic jets. Annu Rev Fluid Mech 34:503–529

    Article  MathSciNet  Google Scholar 

  6. Ho C-M, Huerre P (1984) Perturbed free shear layers. Annu Rev Fluid Mech 463:365–424

    Article  Google Scholar 

  7. Huerre P (2000) Open shear flow instabilities. In: Batchelor GK, Moffatt HK, Worster MG (eds) Perspectives in fluid dynamics. Cambridge University Press, Cambridge

    Google Scholar 

  8. Huerre P, Monkewitz PA (1985) Absolute and convective instabilities in free shear layers. J Fluid Mech 159:151–168

    Article  MathSciNet  MATH  Google Scholar 

  9. Huerre P, Monkewitz PA (1990) Local and global instabilities in spatially developing flows. Annu Rev Fluid Mech 22:473–537

    Article  MathSciNet  Google Scholar 

  10. Miau JJ, Leu TS, Liu TW, Chou JH (1997) On vortex shedding behind a circular disk. Exp Fluids 23:225–233

    Article  Google Scholar 

  11. Michalke A (1965) On spatially growing disturbances in an inviscid shear layer. J Fluid Mech 23:521–544

    Article  MathSciNet  Google Scholar 

  12. Mittal R, Wilson JJ (2001) Symmetry properties of the transitional sphere wake. AIAA 40(3)

    Google Scholar 

  13. Monkewitz PA (1988) A note on vortex shedding from axisymmetric bluff bodies. J Fluid Mech 192:561–575

    Article  MATH  Google Scholar 

  14. Oxlade AR (2013) High-frequency periodic jet forcing of a turbulent axisymmetric wake. PhD dissertation, Imperial College, Department of Aeronautics.

    Google Scholar 

  15. Oxlade AR, Valente PC, Ganapathisubramani B, Morrison JF (2012) Denoising of time-resolved PIV for accurate measurement of turbulence spectra and reduced error in derivatives. Exp Fluids 53:1561–1575

    Article  Google Scholar 

  16. Qubain A (2009) Active control of a turbulent bluff body wake. PhD dissertation, Imperial College, Department of Aeronautics.

    Google Scholar 

  17. Qubain A, Morrison JF (2009) Active control of an axisymmetric turbulent wake. In KATnet II conference on key aerodynamic technologies, Bremen, 12–14, May 2009

    Google Scholar 

  18. Zaman KBMQ, Hussain AKMF (1981) Turbulence suppression in free shear flows by controlled excitation. J Fluid Mech 103:133–159

    Article  Google Scholar 

Download references

Acknowledgments

We are indebted to Ferrari S.p.A. and to EPSRC (Grant number EP/I005684).

Author information

Authors and Affiliations

  1. Department of Aeronautics, Imperial College London, London, UK

    Anthony R. Oxlade, Jonathan F. Morrison & Georgios Rigas

Authors
  1. Anthony R. Oxlade
    View author publications

    You can also search for this author in PubMed Google Scholar

  2. Jonathan F. Morrison
    View author publications

    You can also search for this author in PubMed Google Scholar

  3. Georgios Rigas
    View author publications

    You can also search for this author in PubMed Google Scholar

Corresponding author

Correspondence to Jonathan F. Morrison .

Editor information

Editors and Affiliations

  1. School of Aerospace Engineering, Technical University of Madrid, Madrid, Spain

    Vassilis Theofilis

  2. Department of Mechanical and Aerospace Engineering, Monash University, Melbourne, VIC, Australia, and Department of Aeronautical Engineering, King Abdulaziz University, Jeddah, Saudi Arabia

    Julio Soria

Rights and permissions

Reprints and permissions

Copyright information

© 2015 Springer International Publishing Switzerland

About this paper

Cite this paper

Oxlade, A.R., Morrison, J.F., Rigas, G. (2015). Open-Loop Control of a Turbulent Axisymmetric Wake. In: Theofilis, V., Soria, J. (eds) Instability and Control of Massively Separated Flows. Fluid Mechanics and Its Applications, vol 107. Springer, Cham. https://doi.org/10.1007/978-3-319-06260-0_20

Download citation

  • DOI: https://doi.org/10.1007/978-3-319-06260-0_20

  • Published:

  • Publisher Name: Springer, Cham

  • Print ISBN: 978-3-319-06259-4

  • Online ISBN: 978-3-319-06260-0

  • eBook Packages: EngineeringEngineering (R0)

Publish with us

Policies and ethics

Search

Navigation