Large-Eddy Simulations of Synthetic Jets in Stagnant Surroundings and Turbulent Cross-Flow

  • Don K. L. Wu
  • Michael A. Leschziner
Part of the IUTAM Bookseries book series (IUTAMBOOK, volume 7)


Large-Eddy Simulations (LES) are used to investigate the physical processes involved in the injection of a synthetic (zero-net-flux) jet into a zero-pressure-gradient turbulent boundary layer at conditions corresponding to experimental data obtained by others. The boundary layer ahead of the jet is generated by a separate precursor simulation at a momentum-thickness Reynolds number of Re θ=920, providing the main simulation with a full and accurate description of the unsteady conditions. Phase-averaged results and time-averaged integral quantities are presented and compared against experimental data. This main study is preceded by a simulation of a synthetic-jet injected into stagnant surroundings, mainly in order to verify the computational framework, but also to gain insight into the behaviour of the vortex rings injected through a square orifice, in accord with corresponding experimental conditions.

Key words

Flow control synthetic jets turbulent boundary layer LES 


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Copyright information

© Springer 2008

Authors and Affiliations

  • Don K. L. Wu
    • 1
  • Michael A. Leschziner
    • 1
  1. 1.Department of AeronauticsImperial CollegeLondonUK

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