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IUTAM Symposium on Laminar-Turbulent Transition

Part of the Fluid Mechanics and Its Applications Book Series (volume 78)

Editors: Govindarajan, Rama

DOI: 10.1007/1-4020-4159-4

ISBN: 978-1-4020-3459-6

Publisher: Springer Netherlands - Springer Journals

Jan 1, 2006

1 - 10 of 65 Chapters

Available

LAMINAR SEPARATION BUBBLES

Gaster, M.

Pages: 1 –13

[The phenomenon of leading edge stall is associated with the “bursting” of leading edge separation bubbles from a short form, where the length is roughly 100 momentum thicknesses, to a long form that maybe 1000 or more momentum thicknesses long. The paper reports experiments and theoretical...
Available

TRANSIENT GROWTH WITH APPLICATION BYPASS TRANSITION TO

Henningson, D.S.

Pages: 15 –24

[Transient growth associated with non-normal stability operators are discussed. Results for both temporal and spatial transient growth are presented. These results allow for an understanding of the type of bypass transition found when laminar boundary layers are subjected to free-stream...
Available

THE ROLE OF EXTERNAL DISTURBANCES INLAMINAR-TURBULENT TRANSITION

Wu, Xuesong

Pages: 25 –35

[Transition to turbulence in parallel or nearly parallel flows is known to be critically influenced by ambient perturbations. At relatively low intensity level, external perturbations initiate transition through receptivity process, i.e. by exciting instability waves, but without affecting linear...
Available

MODELING THE EFFECTS OF STEPS ON BOUNDARY-LAYER TRANSITION

Crouch, J.D.; Kosorygin, V.S.; Ng, L.L.

Pages: 37 –44

[An experimental and computational study is conducted to develop a model for the effects of surface steps on transition to turbulence in boundary layers. The step effects are captured within the framework of a variable n-factor method, where the step results in a reduction in the TS-wave...
Available

RECENT OBSERVATIONS OF THE TRANSITION TO TURBULENCE IN A PIPE

Mullin, T.; Peixinho, J.

Pages: 45 –55

[We report the results of an experimental investigation of the transition to turbulence of Poiseuille flow in a long pipe. Our findings confirm that the recently established scaling law for the finite amplitude perturbation required to cause transition is O(Re-1). New results are presented...
Available

LOCALISED INSTABILITY IN UNSTEADY SEPARATION BUBBLES

Arakeri, Jaywant H.; Das, S.P.; Srinivasan, Usha

Pages: 57 –70

[We propose an experimental method to study the instability of thin unsteady separation bubbles, i.e. of unsteady boundary layers with reverse flow. The unsteady boundary layer is created by controlled temporal and spatial variations of the velocity external to the boundary layer. We present...
Available

INTERACTION OF SEPARATION AND TRANSITION IN BOUNDARY LAYERS: DIRECT NUMERICAL SIMULATIONS

Fasel, Hermann F.; Postl, Dieter

Pages: 71 –88

[The role of hydrodynamic instability mechanisms in the presence of laminar boundary layer separation is investigated by means of Direct Numerical Simulations. In a series of simulations involving generic laminar separation bubbles we show that the “natural” onset of unsteadiness (i.e. the...
Available

ON FUNDAMENTAL INSTABILITY MECHANISMS OF NOMINALLY 2-D SEPARATION BUBBLES

Simens, M.; González, L.; Theofilis, V.; Gómez-Blanco, R.

Pages: 89 –95

[The instability of nominally laminar steady two-dimensional closed separation bubbles is investigated using direct numerical simulations and BiGlobal instability analysis. The canonical flat-plate case is studied in some detail. We demonstrate that large steady two-dimensional bubbles may become...
Available

A NEW STABILITY APPROACH FOR THE FLOW INDUCED BY WALL INJECTION

Casalis, G.; Chedevergne, F.; Feraille, Th.; Avalon, G.

Pages: 97 –102

[The present paper deals with the stability analysis of the flow induced As the basic flow is strongly nonparallel, the modal form gives amplistability problem is thus described by a PDE system whose results seem by wall injection either in a rectangular duct or in a cylindrical pipe. tude...
Available

THE PECULIARITIES OF DEVELOPMENT OFFORERUNNERS ON LONGITUDINAL STRUCTURES FRONTS IN THE BOUNDARY LAYER OF A STRAIGHT WING

Gorev, Vasiliy N.; Katasonov, Mikhail M.; Kozlov, Viktor V.

Pages: 103 –108

[Wind-tunnel experiments on longitudinal structures developing in laminar boundary layers on a straight wing have been carried out. High-frequency perturbations, that is, “forerunners” occurring near the fronts of the streamwise disturbances were detected. Their characteristics and dynamics were...

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