Using experimental optimization to tune the kinematics of a flexible propulsor

Daniel B. Quinn, George V. Lauder, Alexander J. Smits

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Gradient-based optimization is used to maximize the propulsive efficiency of a heaving and pitching flexible panel. Random initial conditions are sequentially improved until a minimum step size is reached, at which point the condition is considered locally optimal. Optimum pitch and heave motions are found to produce nearly twice the efficiencies of optimum heave-only motions. Particle Image Velocimetry (PIV) is used to investigate the flow structures at optimal conditions. Efficiency is globally optimized when (1) the Strouhal number is within an optimal range that varies weakly with amplitude and boundary conditions; (2) the panel is actuated at a resonant frequency of the fluidpanel system; (3) heave amplitude is tuned such that trailing edge amplitude is maximized while the flow along the body remains attached; and (4) the maximum pitch angle and phase lag are chosen so that the effective angle of attack is minimized. The multi-dimensionality and multimodality of the efficiency response demonstrate that experimental optimization appears to be well-suited for the design of flexible underwater propulsors.

Original languageEnglish (US)
Title of host publication9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015
PublisherTSFP-9
ISBN (Electronic)9780000000002
StatePublished - 2015
Event9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015 - Melbourne, Australia
Duration: Jun 30 2015Jul 3 2015

Publication series

Name9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015
Volume3

Other

Other9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015
CountryAustralia
CityMelbourne
Period6/30/157/3/15

All Science Journal Classification (ASJC) codes

  • Fluid Flow and Transfer Processes

Fingerprint Dive into the research topics of 'Using experimental optimization to tune the kinematics of a flexible propulsor'. Together they form a unique fingerprint.

  • Cite this

    Quinn, D. B., Lauder, G. V., & Smits, A. J. (2015). Using experimental optimization to tune the kinematics of a flexible propulsor. In 9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015 (9th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2015; Vol. 3). TSFP-9.