Roughness-Induced Bypass Transition, Revisited

The role of surface roughness in boundary-layer transition is an area of active research. Ongoing experiments and numerical simulations are addressing issues of roughness receptivity, transient growth, and bypass mechanisms. As part of these efforts, a comparison of direct numerical simulations (DNS...

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Bibliographic Details
Published in:AIAA journal 2008-07, Vol.46 (7), p.1874-1877
Main Authors: Denissen, Nicholas A, White, Edward B
Format: Article
Language:English
Subjects:
Aircraft
Exact sciences and technology
Fluid dynamics
Fundamental areas of phenomenology (including applications)
Physics
Simulation
Surface roughness
Transition to turbulence
Turbulent flows, convection, and heat transfer
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Summary:The role of surface roughness in boundary-layer transition is an area of active research. Ongoing experiments and numerical simulations are addressing issues of roughness receptivity, transient growth, and bypass mechanisms. As part of these efforts, a comparison of direct numerical simulations (DNS) by Rizzetta and Visbal (hereafter RV) and experiments by Ergin and White (hereafter EW)revealed inconsistencies in transition location and disturbance evolution downstream of a spanwise anay of cylindrical roughness elements. This note presents new experimental data intended to help resolve these discrepancies and to answer questions raised by the previous work. The objective of this work is to reproduce two of the EW cases in an attempt to confirm the Rek values reported by EW and to reconcile the discrepancies between EW and RV. To achieve this, the reported nondimensional parameters of the EW and RV studies are reproduced, and the boundary-layer disturbance profiles, the disturbance energy, and the transition behavior are measured.
ISSN:0001-1452
1533-385X
DOI:10.2514/1.35304