Portal de Periódicos da CAPES

Application of unsteady aerodynamics to large-eddy breakup devices in a turbulent flow

1986; AIP Publishing; Volume: 29; Issue: 6 Linguagem: Inglês

10.1063/1.865605

2163-4998

Ponnampalam Balakumar, Sheila E. Widnall,

Computational Fluid Dynamics and Aerodynamics

The modifications to the vertical velocity of a turbulent flow by the large-eddy breakup devices (LEBU) were analyzed using linear three-dimensional unsteady aerodynamics. A Fourier component of the input turbulence convected over these devices was considered and the modified vertical velocity in the far downstream wake was solved. It is shown that the amplitude of the vertical velocity behind the device is reduced, the effect increasing with increasing stream and spanwise wavenumber. Two plates placed far apart in series produce a reduction that is the square of that for a single plate. The presence of the ground plane decreases the effectiveness of the LEBU in reducing the amplitude of the vertical velocity in the far wake.