Trailing-edge noise from the scattering of spanwise-coherent structures

Sano, Alex; Abreu, Leandra I.; Cavalieri, André V. G.; Wolf, William

doi:10.1103/physrevfluids.4.094602

Cited by 30 publications

(33 citation statements)

References 49 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Such waves are similar to the spanwise coherent structures in the turbulent boundary layer over an airfoil, extracted by SPOD by Sano et al. (2019). As in the cited work, the streamwise velocity displays a change of phase in the wall-normal direction, with near-wall fluctuations nearly in phase opposition with fluctuations for larger wall distances.…”

Section: Analysis Of Nozzle Flowsupporting

confidence: 79%

Nozzle dynamics and wavepackets in turbulent jets

et al. 2021

View full text Add to dashboard Cite

show abstract

Section: Analysis Of Nozzle Flowsupporting

confidence: 79%

Nozzle dynamics and wavepackets in turbulent jets

et al. 2021

View full text Add to dashboard Cite

show abstract

“…In order to consider the symmetry of the problem, we follow an approach similar to that of Sano et al. (2019), defining even and odd parts of the streamwise velocity field as and equivalently for the lateral velocity . This allows POD modes to be computed with half of the experimental domain, reducing the computational cost and enhancing convergence.…”

Section: Experimental Methodologymentioning

confidence: 99%

“…The average of these fields was used to provide the mean flows for the stability analysis and to compute the velocity fluctuations for the POD. In order to consider the symmetry of the problem, we follow an approach similar to that of Sano et al (2019), defining even and odd parts of the streamwise velocity field as…”

Section: Experimental Methodologymentioning

confidence: 99%

Investigation of supersonic twin-jet coupling using spatial linear stability analysis

Nogueira

Edgington-Mitchell

2021

J. Fluid Mech.

View full text Add to dashboard Cite

show abstract

“…2013; Jeun, Nichols & Jovanović 2016; Sano et al. 2019). More specifically, when one considers sound radiation by airfoils, wings and blades at low angles of attack, the dominant aeroacoustic mechanism is referred to as trailing-edge noise.…”

Section: Introductionmentioning

confidence: 99%

Spanwise-coherent hydrodynamic waves around flat plates and airfoils

et al. 2021

Self Cite

View full text Add to dashboard Cite

We investigate spanwise-coherent structures in the turbulent flow around airfoils, motivated by their connection with trailing-edge noise. We analyse well-resolved large-eddy simulations (LES) of the flow around NACA 0012 and NACA 4412 airfoils, both at a Reynolds number of 400 000 based on the chord length. Spectral proper orthogonal decomposition performed on the data reveals that the most energetic coherent structures are hydrodynamic waves, extending over the turbulent boundary layers around the airfoils with significant amplitudes near the trailing edge. Resolvent analysis was used to model such structures, using the mean field as a base flow. We then focus on evaluating the dependence of such structures on the domain size, to ensure that they are not an artefact of periodic boundary conditions in small computational boxes. To this end, we performed incompressible LES of a zero-pressure-gradient turbulent boundary layer, for three different spanwise sizes, with the momentum-thickness Reynolds number matching those near the airfoils trailing edge. The same coherent hydrodynamic waves were observed for the three domains. Such waves are accurately modelled as the most amplified flow response from resolvent analysis. The signature of such wide structures is seen in non-premultiplied spanwise wavenumber spectra, which collapse for the three computational domains. These results suggest that the spanwise-elongated structures are not domain-size dependent for the studied simulations, indicating thus the presence of very wide structures in wall-bounded turbulent flows.

show abstract

Trailing-edge noise from the scattering of spanwise-coherent structures

Cited by 30 publications

References 49 publications

Nozzle dynamics and wavepackets in turbulent jets

Nozzle dynamics and wavepackets in turbulent jets

Investigation of supersonic twin-jet coupling using spatial linear stability analysis

Spanwise-coherent hydrodynamic waves around flat plates and airfoils

Contact Info

Product

Resources

About