Laminar Streaks in Oscillating Boundary Layers

Peter D. Hicks, Pierre Ricco

Research output: Contribution to journalArticle

8 Downloads (Pure)

Abstract

The growth of laminar streaks in a flat-plate boundary layer is investigated in the presence of both spanwise wall oscillations and steady streamwise-dependent spanwise wall forcing. The laminar streaks are forced by free-stream vortical disturbances, which interact with the boundary layer to produce disturbances, which first grow and then decay. The oscillating plate produces a base flow that matches Blasius boundary layer in the streamwise and wall-normal directions, but produces a generalized Stokes layer (GSL) in the spanwise direction. This depends on the Blasius flow and tends to the classical Stokes layer (CSL) in the asymptotic limit of high oscillation frequency or large downstream distance. Spanwise oscillations of the plate and spanwise wall forcing can both reduce the total energy and maximum amplitude of the disturbances. Their relative effects are discussed.
Original languageEnglish
Pages (from-to)264–273
Number of pages10
JournalProcedia IUTAM
Volume14
Early online date2 Jul 2015
DOIs
Publication statusPublished - 2 Jul 2015

Fingerprint

boundary layer
oscillation
disturbance
baseflow
plate boundary
energy

Keywords

  • Boundary layer
  • Flow control
  • Energy reduction

Cite this

Laminar Streaks in Oscillating Boundary Layers. / Hicks, Peter D.; Ricco, Pierre.

In: Procedia IUTAM, Vol. 14, 02.07.2015, p. 264–273.

Research output: Contribution to journalArticle

Hicks, Peter D. ; Ricco, Pierre. / Laminar Streaks in Oscillating Boundary Layers. In: Procedia IUTAM. 2015 ; Vol. 14. pp. 264–273.
@article{15eae76fd77740e6a64c8c76ebcaffb3,
title = "Laminar Streaks in Oscillating Boundary Layers",
abstract = "The growth of laminar streaks in a flat-plate boundary layer is investigated in the presence of both spanwise wall oscillations and steady streamwise-dependent spanwise wall forcing. The laminar streaks are forced by free-stream vortical disturbances, which interact with the boundary layer to produce disturbances, which first grow and then decay. The oscillating plate produces a base flow that matches Blasius boundary layer in the streamwise and wall-normal directions, but produces a generalized Stokes layer (GSL) in the spanwise direction. This depends on the Blasius flow and tends to the classical Stokes layer (CSL) in the asymptotic limit of high oscillation frequency or large downstream distance. Spanwise oscillations of the plate and spanwise wall forcing can both reduce the total energy and maximum amplitude of the disturbances. Their relative effects are discussed.",
keywords = "Boundary layer, Flow control, Energy reduction",
author = "Hicks, {Peter D.} and Pierre Ricco",
note = "Acknowledgements This research was partially supported by EPSRC First Grant EP/I033173/1 and made use of computing resources at the University of Aberdeen and the University of Sheffield.",
year = "2015",
month = "7",
day = "2",
doi = "10.1016/j.piutam.2015.03.049",
language = "English",
volume = "14",
pages = "264–273",
journal = "Procedia IUTAM",
issn = "2210-9838",

}

TY - JOUR

T1 - Laminar Streaks in Oscillating Boundary Layers

AU - Hicks, Peter D.

AU - Ricco, Pierre

N1 - Acknowledgements This research was partially supported by EPSRC First Grant EP/I033173/1 and made use of computing resources at the University of Aberdeen and the University of Sheffield.

PY - 2015/7/2

Y1 - 2015/7/2

N2 - The growth of laminar streaks in a flat-plate boundary layer is investigated in the presence of both spanwise wall oscillations and steady streamwise-dependent spanwise wall forcing. The laminar streaks are forced by free-stream vortical disturbances, which interact with the boundary layer to produce disturbances, which first grow and then decay. The oscillating plate produces a base flow that matches Blasius boundary layer in the streamwise and wall-normal directions, but produces a generalized Stokes layer (GSL) in the spanwise direction. This depends on the Blasius flow and tends to the classical Stokes layer (CSL) in the asymptotic limit of high oscillation frequency or large downstream distance. Spanwise oscillations of the plate and spanwise wall forcing can both reduce the total energy and maximum amplitude of the disturbances. Their relative effects are discussed.

AB - The growth of laminar streaks in a flat-plate boundary layer is investigated in the presence of both spanwise wall oscillations and steady streamwise-dependent spanwise wall forcing. The laminar streaks are forced by free-stream vortical disturbances, which interact with the boundary layer to produce disturbances, which first grow and then decay. The oscillating plate produces a base flow that matches Blasius boundary layer in the streamwise and wall-normal directions, but produces a generalized Stokes layer (GSL) in the spanwise direction. This depends on the Blasius flow and tends to the classical Stokes layer (CSL) in the asymptotic limit of high oscillation frequency or large downstream distance. Spanwise oscillations of the plate and spanwise wall forcing can both reduce the total energy and maximum amplitude of the disturbances. Their relative effects are discussed.

KW - Boundary layer

KW - Flow control

KW - Energy reduction

U2 - 10.1016/j.piutam.2015.03.049

DO - 10.1016/j.piutam.2015.03.049

M3 - Article

VL - 14

SP - 264

EP - 273

JO - Procedia IUTAM

JF - Procedia IUTAM

SN - 2210-9838

ER -