5 papers · 1 filter
Identification of structures driving trailing-edge noise. Part II -- Numerical investigation
Zhenyang Yuan, Simon Demange, Kilian Oberleithner +2
The aim of the present work is to investigate the mechanisms of broadband trailing-edge noise generation to improve prediction tools and control strategies. We focus on a NACA 0012…
Identification of structures driving trailing-edge noise. Part I -- Experimental investigation
Simon Demange, Zhenyang Yuan, Simon Jekosch +4
Trailing-edge (TE) noise is the main contributor to the acoustic signature of flows over airfoils. It originates from the interaction of turbulent structures in the airfoil boundar…
Airfoil tonal noise reduction by roughness elements Part I -- Experimental investigation
ElÃas Alva, Zhenyang Yuan, Tiago B. Araújo +3
Laminar separation bubbles around airfoils lead to the growth of instability waves, which enhances to acoustic scattering at the trailing-edge, forming a feedback loop that produce…
Airfoil Tonal Noise Reduction by Roughness Elements. Part II -- Direct Simulations
Zhenyang Yuan, ElÃas Alva, Tiago B. de Araújo +2
In a combined experimental and numerical effort we investigate airfoil tonal noise generation and reduction. The means of noise control are streak generators in form of cylindrical…
Coherent pressure structures in turbulent channel flow
F. R. Amaral, A. V. G. Cavalieri
Most of the studies on pressure fluctuations in wall-bounded turbulent flows aim at obtaining statistics as power spectra and scaling laws, especially at the walls. In the present…