Zobrazeno 1 - 10 of 48 pro vyhledávání: '"Perry L. Johnson"'
1
On the large-scale sweeping of small-scale eddies in turbulence -- A filtering approach
Autor: Theodore D. Drivas, Cristian Lalescu, Michael Wilczek, Perry L. Johnson
We present an analysis of the Navier-Stokes equations based on a spatial filtering technique to elucidate the multi-scale nature of fully developed turbulence. In particular, the advection of a band-pass-filtered small-scale contribution by larger sc
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::95928fbfe8a379705ab991993749b868
http://arxiv.org/abs/2307.11195
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2
New Exact Betchov-like Relation for the Helicity Flux in Homogeneous Turbulence
Autor: Damiano Capocci, Perry L. Johnson, Sean Oughton, Luca Biferale, Moritz Linkmann
Publikováno v: Capocci, D, Johnson, P L, Oughtton, S, Biferale, L & Linkmann, M 2023, ' New Exact Betchov-like Relation for the Helicity Flux in Homogeneous Turbulence ', Journal of Fluid Mechanics, vol. 963, R1 . https://doi.org/10.1017/jfm.2023.236
In homogeneous and isotropic turbulence, the relative contributions of different physical mechanisms to the energy cascade can be quantified by an exact decomposition of the energy flux (Johnson, Phys. Rev. Lett., vol. 124, 2020, 104501; J. Fluid Mec
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8e32ae77e93d9d4b0986019fd78b68eb
https://hdl.handle.net/20.500.11820/f9e542cf-940f-4d68-b77b-1cf54432a20f
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5
The squeezes, stretches, and whirls of turbulence
Autor: Perry L. Johnson
Publikováno v: Physics Today. 74:46-51
Fluid turbulence generates a chaotic soup of strongly nonlinear features that are hard to mathematically describe and model. A recent theoretical simplification brings fresh insight.
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fbc8d4ec306f5761b7ce4124624abe30
https://doi.org/10.1063/pt.3.4725
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7
On the enhancement of boundary layer skin friction by turbulence: an angular momentum approach
Autor: Ahmed Elnahhas, Perry L. Johnson
Turbulence enhances the wall shear stress in boundary layers, significantly increasing the drag on streamlined bodies. Other flow features such as free stream pressure gradients and streamwise boundary layer growth also strongly influence the local s
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9f8b1b542438bdacb07376ac93368d39
http://arxiv.org/abs/2107.03043
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8
On the role of vorticity stretching and strain self-amplification in the turbulence energy cascade
Autor: Perry L. Johnson
The tendency of turbulent flows to produce fine-scale motions from large-scale energy injection is often viewed as a scale-wise cascade of kinetic energy driven by vorticity stretching. This has been recently evaluated by an exact, spatially local re
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7d4d328d519cc02b6b214c6c163d3329
http://arxiv.org/abs/2102.06844
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10
A physics-inspired alternative to spatial filtering for large-eddy simulations of turbulent flows
Autor: Perry L. Johnson
Large-eddy simulations (LES) are widely used for computing high Reynolds number turbulent flows. Spatial filtering theory for LES is not without its shortcomings, including how to define filtering for wall-bounded flows, commutation errors for non-un
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6c5ecd410622e6019c3a3349412bf764
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