Abstract
A new intermittency function flagging the turbulent, becalmed, and non-becalmed regions of transitional flow is introduced. In addition, a method is developed to detect embedded incipient turbulent spots within the non-becalmed regions of the flow, which are then documented, counted, and related to Emmons’ spot production rate. This in turn is used to calculate an intermittency distribution which when compared with that measured displays an excellent agreement. Finally, it is shown that correlations based on Narasimha’s intermittency equation are highly questionable.
Issue Section:
Research Papers
References
1.
Emmons
, H. W.
, 1951
, “The Laminar-Turbulent Transition in a Boundary Layer—Part I
,” J. Aero. Sci.
, 18
(7
), pp. 490
–498
. 2.
Schubauer
, G. B.
, and Klebanoff
, P. S.
, 1956
, Contributions on the Mechanics of Boundary-Layer Transition
. Technical Report, NACA-1289
, National Advisory Committee on Aeronautics
.3.
Mayle
, R. E.
, 2018
, Elements of Transitional Boundary-Layer Flow
, Logos Verlag Berlin
, Germany
.4.
Dhawan
, S.
, and Narasimha
, R.
, 1958
, “Some Properties of Boundary Layer Flow During Transition From Laminar to Turbulent Motion
,” J. Fluid. Mech.
, 3
(4
), pp. 418
–436
. 5.
Narasimha
, 1957
, “On the Distribution of Intermittency in the Transition Region of a Boundary Layer
,” J. Aero. Sci.
, 24
(9
), pp. 711
–712
.6.
Albiez
, H.
, Gramespacher
, C.
, Stripf
, M.
, and Bauer
, H.-J.
, 2020
, “High Resolution Measurements of Heat Transfer, Near-Wall Intermittency, and Reynolds-stresses Along a Flat Plate Transitional Boundary Layer Under the Influence of High Freestream Turbulence
,” ASME J. Heat. Transfer.
, 142
(4
), p. 042105
. 7.
Gostelow
, J. P.
, Melwani
, N.
, and Walker
, G. J.
, 1996
, “Effects of Streamwise Pressure Gradient on Turbulent Spot Development
,” ASME J. Turbomach.
, 118
(4
), pp. 737
–743
. 8.
Makita
, H.
, and Nishizawa
, A.
, 1998
, “Interaction Between Two Horizontally Displaced Turbulent Spots
,” Trans. Japan Soc. Mech. Eng. Seri. B
, 64
(627
), pp. 3682
–3689
. (in Japanese)9.
Hamming
, R. W.
, 1989
, Digital Filters
, Dover Publications
, N.Y
.10.
Breuer
, K. S.
, Cohen
, J.
, and Haritonidis
, J. H.
, 1997
, “The Late Stages of Transition Induced by a Low-Amplitude Wavepacket in a Laminar Boundary Layer
,” J. Fluid. Mech.
, 340
, pp. 395
–411
. 11.
Zaki
, T. A.
, 2013
, “From Steaks to Spots and on to Tubulence: Exploring the Dynamics of Boundary Layer Transition
,” Flow Turbul. Combust.
, 91
(3
), pp. 451
–473
. 12.
Solomon
, W. J.
, Walker
, G. J.
, and Gostelow
, J. P.
, 1996
, “Transition Length Prediction for Flows With Rapidly Changing Pressure Gradients
,” ASME J. Turbomach.
, 118
(4
), pp. 744
–751
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