Numerical investigation of the spatial development of a wave packet in laminar boundary layers with zero and adverse pressure gradient

Anthony Haas, Hermann F. Fasel

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

Abstract

The effect of an adverse pressure gradient (without separation) on the downstream development of a wave packet in a flat plate boundary layer is investigated using threedimensional Direct Numerical Simulations (DNS) based on the incompressible Navier-Stokes equations. The wave packet was generated by a short duration pulse at the surface of the flat plate. Both the linear and nonlinear stages of the evolution of the wave packet were considered. For investigating the linear stages, the initial disturbance amplitudes were kept very small, whereas for investigating the nonlinear stages, larger amplitudes were used. The DNS results for the linear case are in very good agreement with Linear Stability Theory (LST) calculations. The pressure gradient was found to significantly increase the growth of instability waves compared to the case without pressure gradient. For the high-amplitude case, the strong disturbance growth and the ensuing nonlinear interactions quickly lead to the formation of a turbulent spot.

Original languageEnglish (US)
Title of host publication43rd Fluid Dynamics Conference
StatePublished - Sep 11 2013
Event43rd AIAA Fluid Dynamics Conference - San Diego, CA, United States
Duration: Jun 24 2013Jun 27 2013

Publication series

Name43rd Fluid Dynamics Conference

Other

Other43rd AIAA Fluid Dynamics Conference
CountryUnited States
CitySan Diego, CA
Period6/24/136/27/13

ASJC Scopus subject areas

  • Fluid Flow and Transfer Processes
  • Energy Engineering and Power Technology
  • Aerospace Engineering
  • Mechanical Engineering

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