Abstract
Vorticity measurements, which are scarce at the present time, can provide valuable dynamical information, particularly in unsteady and separated flows. Advances in laser Doppler anemometry and optical techniques have furnished the opportunity for the development of a non-intrusive vorticity probe with very fine spatial and temporal resolutions. The laser vorticity probe (LAVOR), which makes use of minimal laser beams and optical components, is capable of measuring velocity gradients with a separation distances as small as 0.3 mm. Velocity gradients are measured using two points on the same probe volume. However, unlike other techniques, the LAVOR also provides the instantaneous velocity at each point in the probe volume, and so provides additional dynamical information. The LAVOR probe was used in a fully turbulent two-dimensional boundary layer, and the data obtained are compared with the existing hot-wire vorticity data obtained in the same wind tunnel facility and with data obtained in other facilities. The spatial resolution is of the order of three Kolmogorov microscale units.
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References
Agui JH, Andreopoulos J (1994) Development of a new LASER vor-ticity probe-LAVOR. In: Huang, Otugen (eds) Fluids Engineering Division of ASME, International Symposium on LASER Ane-mometry, FED vol 191, Lake Tahoe, Nev., 20–24, June pp 11–19
Andreopoulos J, Agui JH (1996) Wall-vorticity flux dynamics in a two-dimensional turbulent boundary layer. J Fluid Mech 309: 45–84
Andreopoulos J, Honkan A (1996) Experimental techniques for highly resolved measurements of rotation, strain and dissipation rate tensors in turbulent flows. Meas Sei Technol 7:1462–1472
Andreopoulos Y, Honkan A (2001) An experimental study of the dissipative and vortical motions in turbulent boundary layers. J Fluid Mech 439:131–163
Andreopoulos J, Durst F, Zaric’ Z, Jovanovic J (1984) Influence of Reynolds number on characteristics of turbulent wall boundary layers. Exp Fluids 2:7–16
Andreopoulos Y, Agui JH, Briassulis G (2000) Shock wave-turbulence interactions. Annu Rev Fluid Mech 32:309–345
Balint J, Wallace JM, Vukoslavcevic P (1991) The velocity and vor-ticity vector fields of a turbulent boundary layer. Part 2. Statistical properties. J Fluid Mech 228:53–86
Bradshaw P, Huang GP (1995) The law of the wall in turbulent flow. Proc R Soc London A 451:165–188
Briassulis G, Agui J, Andreopoulos Y (2001) The structure of weakly compressible grid turbulence. J Fluid Mech 432:219–283
Bruns J, Dengel P, Fernholz HH (1992) Mean flow and turbulence measurements in an incompressible two-dimensional boundary layer. Part I: Data Institute’s Report 02/92, Hermann-Föttinger-Institut für Thermo- und Fluiddynamik, Technische Universität Berlin
Foss JF, Wallace JM (1989) The measurement of vorticity in transitional and fully developed turbulent flows. In: Gad-el-Hak M (ed) Advances in fluid mechanics measurements, Lecture Notes in Engineering 45. Springer New York Berlin Heidelberg
Fraser RA, Felton PG, Bracco FV, Santavica DA (1986) Preliminary turbulence length scale measurements in a motored IC engine. SAE Paper 860021
Frish MB, Webb WW (1981) Direct measurements by optical probe. J Fluid Mech 107:173–185
Honkan A (1994) An experimental study of the vortical structure of turbulent flows. PhD Thesis, City University of New York
Honkan A, Andreopoulos J (1993) Experimental investigation of time-resolved vorticity in two dimensional turbulent boundary layer flows. AIAA 93-2910, AIAA 24th Fluid Dynamics Conference, Orlando, Florida
Honkan A, Andreopoulos Y (1997a) Vorticity, strain-rate and dissipation characteristics in the near-wall region of turbulent boundary layers. J Fluid Mech 350:29–96
Honkan A, Andreopoulos Y (1997b) Instantaneous three dimensional vorticity measurements in vortical flow over a delta wing. AIAA J 35:1612–1620
Johns RJR, Pitcher GF, Winkelhofer E (1986) Measurement of spatial correlations in a turbulent flow with a two-dimensional back-scatter LDA system. Paper presented at the 3rd International Symposium on Applications of Laser Anemometry to Fluid Mechanics, Lisbon, Portugal
Kim J, Moin P, Moser R (1987) Turbulence statistics in fully developed channel flow at low Reynolds number. J Fluid Mech 177:133–136
Klewicki JC (1989) On the interactions between the inner and outer region motions in turbulent boundary layers. PhD Dissertation, Michigan State University, East Lansing, Mich.
Klewicki JC, Falco RE (1990) On accurately measuring statistics associated with small-scale structure in turbulent boundary layers using hot-wire probes. J Fluid Mech 219:119–142
Kolmogorov AA (1941) The local structure of turbulence in incompressible viscous fluid for very large Reynolds numbers. CR Akad Sei URSS 30:301–306
Lang DB (1985) Laser Doppler velocity and vorticity measurements in turbulent shear layers. PhD Dissertation, CALTECH
Lang DB, Dimotakis PE (1984) Vorticity measurements in a two-dimensional shear-layer. Bull Am Phys Soc 29:1556
Lighthill MJ (1963) Chapter II. In: Rosenhead L (ed) Laminar boundary layer. Oxford University Press, Oxford
Lourenco L, Krothapalli A (1987) The role of photographic parameters in laser-speckle of particle image displacement velocimetry. Exp Fluids 5:23–31
Mansour NN, Kim J, Moin P (1988) Reynolds-stress and dissipation-rate budgets in a turbulent channel flow. J Fluid Mech 194:15–44
Meinhart CD, Adrian RJ (1995) Measurements of the zero-pressure-gradient turbulent boundary layer using particle image velocimetry. AIAA Paper 95-0789
Nakatani N, Tokita ME, Mocgowa ME, Yamada T (1986) Simultaneous measurement of flow velocity variations at several points with multi-point LDV. Paper presented at the International Conference on Laser Anemometry, Manchester, UK
Otugen MV, Papadopoulos G (1998) A new laser-based method for strain rate and vorticity measurements. Meas Sei Technol 9:267–274
Panton RL (1984) Incompressible flow. John Wiley, New York
Purtell LP, Klebanoff PS, Buckley FT (1981) Turbulent boundary layer at low Reynolds number. Phys Fluids 24:802–811
Rajagopalan S, Antonia RH (1993) RMS spanwise vorticity measurements in a turbulent boundary layer. Exp Fluids 14:142–144
Romano GP, Antonia RA, Zhou T (1999) Evaluation of LDA temporal and spatial velocity structure functions in a low Reynolds number turbulent channel flow. Exp Fluids 27:368–377
Spalart PR (1988) Direct simulation of a turbulent boundary layer up to R θ =1410. J Fluid Mech 187:61–98
Spalding DB (1961) A single formula for the law of the wall. Trans ASME E 28:455–458
Tsinober A, Kit E, Dracos T (1992) Experimental investigation of the field of velocity gradients in turbulent flows. J Fluid Mech 242:169–192
Vukoslavcevic P, Wallace JM, Bahnt J (1991) The velocity and vorticity vector fields of a turbulent boundary layer. Part 1. Simultaneous measurement by hot-wire anemometry. J Fluid Mech 228:25–51
Wallace JM (1984) The measurement of vorticity in turbulent flows. Paper presented at the 9th Biannual Symposium on Turbulence, University of Missouri Rolla
Wallace JM, Foss J (1995) The measurement of vorticity in turbulent flows. Annu Rev Fluid Mech 27:469–514
Wei T, Willmarth WW (1989) Reynolds number effects on the structure of a turbulent channel flow. J Fluid Mech 204:57–72
Wyngaard J (1969) Spatial resolution of the vorticity meter and other hot-wire arrays. J Phys E 2:983–987
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Published online: 19 October 2002
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Agui, J.H., Andreopoulos, Y. A new laser vorticity probe — LAVOR: Its development and validation in a turbulent boundary layer. Experiments in Fluids 34, 192–205 (2003). https://doi.org/10.1007/s00348-002-0547-z
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DOI: https://doi.org/10.1007/s00348-002-0547-z