Nonlinear effects on the receptivity of cross-flow in the swept Hiemenz flow

Thomas, Christian, Hall, Philip and Davies, Christopher ORCID: https://orcid.org/0000-0002-5592-9541 2015. Nonlinear effects on the receptivity of cross-flow in the swept Hiemenz flow. Journal of Fluid Mechanics 763 , pp. 433-459. 10.1017/jfm.2014.688

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Abstract

Nonlinear effects on the receptivity of cross-flow in the swept Hiemenz boundary layer are investigated. Numerical simulations are generated using a vorticity form of the Navier–Stokes equations. Steady perturbations are established using surface suction and blowing distributed along the spanwise direction as either a periodic strip or a band of small holes. The method of excitation, the size and the location of the prescribed forcing are shown to have a significant influence on the receptivity of the boundary layer. Blowing holes are found to excite perturbations with considerably larger magnitudes than those generated using a periodic suction and blowing strip. A semi-logarithmic relationship is derived that relates the initial amplitude of the linear-only disturbances with the location at which the absolute magnitude of the chordwise primary Fourier harmonic attains a stationary point or a size of approximately one-tenth of the free-stream spanwise velocity. Furthermore, the size of the physical chordwise velocity perturbation about this position can be estimated directly from the linear-only solutions. This would suggest that, for sufficiently small initial amplitudes, the onset of some nonlinear flow development properties can be predicted directly from a linear receptivity analysis.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Mathematics
Subjects:	Q Science > QA Mathematics
Uncontrolled Keywords:	Boundary layer receptivity; Boundary layer stability; Nonlinear instability
Additional Information:	Pdf uploaded in accordance with publisher's policy at http://www.sherpa.ac.uk/romeo/issn/0022-1120/ (accessed 16/03/2015)
Publisher:	Cambridge University Press (CUP)
ISSN:	0022-1120
Date of First Compliant Deposit:	30 March 2016
Date of Acceptance:	24 November 2014
Last Modified:	06 Jan 2024 04:53
URI:	https://orca.cardiff.ac.uk/id/eprint/67890

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