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lionel agostini
Discipline:
Engineering
69 kenyon street, london, sw6 6la. United Kingdom
https://www.mysciencework.com/profile/lionel.agostini.1
Summary
Published articles Show More
On the departure of near-wall turbulence from the quasi-steady state
Published in Journal of Fluid Mechanics
An examination is undertaken of the validity and limitations of the quasi-steady hypothesis of near-wall turbulence. This hypothesis is based on the supposition that the statistics of the turbulent fluctuations are universal if scaled by the local, instantaneous, wall shear when its variations are determined from footprints of large-scale, energeti...
The connection between the spectrum of turbulent scales and the skin-friction statistics in channel flow at
Published in Journal of Fluid Mechanics
Data from a direct numerical simulation for channel flow at a friction Reynolds number of 1000 are analysed to derive statistical properties that offer insight into the mechanisms by which large-scale structures in the log-law region affect the small-scale turbulence field close to the wall and the statistical skin-friction properties. The data com...
The Impact of Footprints of Large-Scale Outer Structures on the Near-Wall Layer in the Presence of Drag-Reducing Spanwis...
Published in Flow, Turbulence and Combustion
This study is motivated by the observation that the drag-reduction effectiveness achieved by the imposition of oscillatory spanwise wall motion declines with Reynolds number. The question thus posed is whether the decline is linked to the increasingly strong influence of large-scale outer structures in the log layer on the near-wall turbulence, in ...
Conferences Show More
Inferring the structural properties of eddies in the log layer from spectral statistics
Published in 10th International Symposium on Turbulence and Shear Flow Phenomena (TSFP10)
The paper examines various features of the premultiplied spec- tra, the premultiplied derivatives of the second-order structure func- tion (PMDS2) and three scalar parameters that characterize the anisotropic or isotropic state of the various length-scale sub-ranges within the spectra for channel flow at Reτ = 4200, generated by Lozano-Duran and Ji...
A preliminary spectral decomposition and scale separation analysis of a high-fidelity dynamic stall dataset
Published in 54th AIAA Aerospace Sciences Meeting
Dynamic stall results in major excursions from the desired aerodynamic performance. Among the key events are flow separation and the formation of a leading edge vortex (LEV). In this work, we use data obtained from anextensively validated Large Eddy Simulation of a plunging SD 7003 airfoil to explore the spectral content and predominant length scal...
Analysis of intermittency of supersonic jet noise with synchronized LES
Published in 21st AIAA/CEAS Aeroacoustics Conference
The effect of turbulent fluctuations on the axis and lip-line of a Mach 1.3 cold jet are analysed with a synchronized pair of Large Eddy Simulations. “Organic” signals are extracted from the first simulation (baseline), processed and injected into a second simulation (twin). The baseline and the twin are then time advanced in a lock step manner. Sp...
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