Computational evaluation of the performance of lifting surfaces with leading-edge protuberances

Journal Article (Journal Article)

The leading-edge tubercles of humpback whale flippers have been shown to enhance hydrodynamic performance by increasing lift and decreasing drag poststall. To explore this effect, computational simulations of two models based on an idealized humpback whale flipper were conducted, one with a smooth leading edge and one with simulatedleading-edge tubercles. Two different commercial computational fluid dynamics packages were used, STAR-CCM+ and SolidWorks Flow Simulation, and the results were compared with experiment. Numeric lift predictions in the nonstall region were reasonably accurate (maximum error 6.6% between both codes), while lift predictions in the poststall region were problematic. Numeric drag predictions in the early nonstall region were within experimental error for STAR-CCM+ using the Spalart-Allmaras turbulence model, while both codes exhibited drag prediction error in the stall region. Flow visualizations showed that the smooth flipper exhibited trailing-edge stall, while the simulated tubercle flipper stalled in the troughs, behind the leading notches, first. At high angles of attack, the simulated tubercle flipper still possessed significant regions of attached flow, which contributes to its ability to maintain increased lift poststall. © Copyright 2010.

Full Text

Duke Authors

Cited Authors

  • Weber, PW; Howle, LE; Murray, MM; Miklosovic, DS

Published Date

  • January 1, 2011

Published In

Volume / Issue

  • 48 / 2

Start / End Page

  • 591 - 600

Electronic International Standard Serial Number (EISSN)

  • 1533-3868

International Standard Serial Number (ISSN)

  • 0021-8669

Digital Object Identifier (DOI)

  • 10.2514/1.C031163

Citation Source

  • Scopus