Zobrazeno 1 - 10
of 256
pro vyhledávání: '"Laurette, S."'
In a vertical channel driven by an imposed horizontal temperature gradient, numerical simulations have previously shown steady, time-periodic and chaotic dynamics. We explore the observed dynamics by constructing invariant solutions of the three-dime
Externí odkaz:
http://arxiv.org/abs/2403.19493
Vertical thermal convection is a non-equilibrium system in which both buoyancy and shear forces play a role in driving the convective flow. Beyond the onset of convection, the driven dissipative system exhibits chaotic dynamics and turbulence. In a t
Externí odkaz:
http://arxiv.org/abs/2403.18563
Publikováno v:
Phys. Rev. Lett. 132, 264002 (2024)
Directed percolation (DP), a universality class of continuous phase transitions, has recently been established as a possible route to turbulence in subcritical wall-bounded flows. In canonical straight pipe or planar flows, the transition occurs via
Externí odkaz:
http://arxiv.org/abs/2402.08829
Publikováno v:
Physical Review Fluids 6, 063901 (2021)
A number of approximations have been proposed to estimate basic hydrodynamic quantities, in particular the frequency of a limit cycle. One of these, RZIF (for Real Zero Imaginary Frequency), calls for linearizing the governing equations about the mea
Externí odkaz:
http://arxiv.org/abs/2102.07255
Publikováno v:
Phys. Rev. Fluids 5, 083905 (2020)
Intermittent turbulent-laminar patterns characterize the transition to turbulence in pipe, plane Couette and plane channel flows. The time evolution of turbulent-laminar bands in plane channel flow is studied via direct numerical simulations using th
Externí odkaz:
http://arxiv.org/abs/2002.07435
Publikováno v:
Phys. Rev. Fluids 5, 024601 (2020)
In many simulations of turbulent flows the viscous forces $\nu\nabla^2 {\bf u}$ are replaced by a hyper-viscous term $-\nu_p(-\nabla^2)^{p}{\bf u}$ in order to suppress the effect of viscosity at the large scales. In this work we examine the effect o
Externí odkaz:
http://arxiv.org/abs/1911.05623
Publikováno v:
Journal of Fluid Mechanics 805, 591-610 (2016)
Standing waves appear at the surface of a spherical viscous liquid drop subjected to radial parametric oscillation. This is the spherical analogue of the Faraday instability. Modifying the Kumar & Tuckerman (1994) planar solution to a spherical inter
Externí odkaz:
http://arxiv.org/abs/1905.05844
Publikováno v:
Journal of Fluid Mechanics 870, 433-459 (2019)
We consider a spherical variant of the Faraday problem, in which a spherical drop is subjected to a time-periodic body force, as well as surface tension. We use a full three-dimensional parallel front-tracking code to calculate the interface motion o
Externí odkaz:
http://arxiv.org/abs/1905.04485
Publikováno v:
Phys. Rev. Fluids 4, 044402 (2019)
A number of time-periodic flows have been found to have a property called RZIF: when a linear stability analysis is carried out about the temporal mean (rather than the usual steady state), an eigenvalue is obtained whose Real part is Zero and whose
Externí odkaz:
http://arxiv.org/abs/1905.01746
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