Zobrazeno 1 - 10
of 47
pro vyhledávání: '"Wesfreid, Jose Eduardo"'
We report the experimental discovery of propagating trains of localized structures -- oscillons -- on top of Faraday waves in a vertically-vibrated fluid layer confined in a thin annular cell. These structures emerge spontaneously beyond a threshold
Externí odkaz:
http://arxiv.org/abs/2311.11186
Publikováno v:
Phys. Rev. Fluids 9, 033901 (2024)
Flow field measurements from a Couette-Poiseuille experiment are used to examine quantitatively certain steps of the self-sustained process (SSP) of wall-bounded transition to turbulence. Although the different parts of the SSP have been discussed at
Externí odkaz:
http://arxiv.org/abs/2308.16792
Autor:
Liu, Tao, Semin, Benoît, Klotz, Lukasz, Godoy-Diana, Ramiro, Wesfreid, José Eduardo, Mullin, Tom
Publikováno v:
Journal of Fluid Mechanics 915, A65 (2021)
We report the results of an experimental investigation into the decay of turbulence in plane Couette-Poiseuille flow using 'quench' experiments where the flow laminarises after a sudden reduction in Reynolds number $Re$. Specifically, we study the ve
Externí odkaz:
http://arxiv.org/abs/2008.08851
Publikováno v:
Journal of Fluid Mechanics, 2019, vol. 863, pp.386-406
The hairpin instability of a jet in a crossflow (JICF) for a low jet-to-crossflow velocity ratio is investigated experimentally for a velocity ratio range of $R\in(0.14,0.75)$ and crossflow Reynolds numbers $Re_D\in(260,640)$. From spectral analysis
Externí odkaz:
http://arxiv.org/abs/1902.07931
Autor:
Dessup, Tommy, Tuckerman, Laurette S., Wesfreid, Jose Eduardo, Barkley, Dwight, Willis, Ashley P.
Publikováno v:
Phys. Rev. Fluids 3, 123902 (2018)
The transition from Tayor vortex flow to wavy-vortex flow is revisited. The Self-Sustaining Process (SSP) of Waleffe [Phys. Fluids 9, 883-900 (1997)] proposes that a key ingredient in transition to turbulence in wall-bounded shear flows is a three-st
Externí odkaz:
http://arxiv.org/abs/1808.07253
Publikováno v:
Phys. Rev. Fluids 3, 013905 (2018)
The wake behind a sphere, rotating about an axis aligned with the streamwise direction, has been experimentally investigated in a low-velocity water tunnel using LIF visualizations and PIV measurements. The measurements focused on the evolution of th
Externí odkaz:
http://arxiv.org/abs/1712.04895
Autor:
Klotz, Lukasz, Lemoult, Grégoire, Frontczak, Idalia, Tuckerman, Laurette S., Wesfreid, José Eduardo
We present a new experimental set-up that creates a shear flow with zero mean advection velocity achieved by counterbalancing the nonzero streamwise pressure gradient by moving boundaries, which generates plane Couette-Poiseuille flow. We carry out t
Externí odkaz:
http://arxiv.org/abs/1704.02619
In recent studies on wake stability, it has been observed that a simple linear stability analysis applied to the mean flow instead of the basic flow, could give an accurate prediction of the global mode selected frequency, although these phenomena ar
Externí odkaz:
http://arxiv.org/abs/1506.05948
Publikováno v:
Proc. R. Soc. A 471, 20150011 (2015)
The wake flow around a circular cylinder at $Re\approx100$ performing rotatory oscillations has been thoroughly discussed in the literature, mostly focusing on the modifications to the natural B\'enard-von K\'arm\'an vortex street that result from th
Externí odkaz:
http://arxiv.org/abs/1504.06229
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