Influence of Vortex Core on Wake Vortex Sound Emission

Detection and Estimation of Wake Vortex On

An algorithm for the detection and estimation of a wake vortex using a lateral Range Height Indicator (RHI) observation of a pulsedDoppler lidar is proposed. By estimating physical parameters from measured Doppler spectra, the proposed method achieves high accuracy and robustness even in low Carrierto-Noise Ratio (CNR) conditions. This paper describes the methodology and presents an initial eva...

Wake Vortex Algorithm Scoring Results

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Dynamic Load Alleviation in Wake Vortex Encounters

Longitudinal vortex structures in a cylinder wake

Recently, flow visualizations by Wei and Smith,’ Williamson,’ Welsh et a1.,3 and Bays-Muchmore and Ahmed4 have shown that three-dimensional (3-D) vertical structures develop in the wake of a bluff body. The 3-D vertical structures were found to include pairs of counterrotating longitudinal vortices superimposed on the nominally two-dimensional (2-D) Kirmin vortex street as speculated by Grant’ ...

Vortex Dynamics in the Sphere Wake

A highly accurate Fourier-Chebyshev spectral collocation method has been used to simulate flow in the wake of a sphere in the Reynolds number range from 350 to 650. Flow visualizations and frequency spectra provide a glimpse of the complex vortex dynamics that are observed in the sphere wake. It is found that in addition to the vortex shedding frequency which corresponds to the shedding of larg...