Suppression of Rayleigh-Taylor turbulence by time-periodic acceleration

Boffetta, G.; Magnani, Marta; Musacchio, Stefano

doi:10.1103/physreve.99.033110

Cited by 19 publications

(11 citation statements)

References 35 publications

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“…The above phenomenon is also demonstrated by previous direct numerical simulations [16]. The heat transport suppression by the rotation is qualitatively different from that of rotating Rayleigh-Bénard (RB) convection by the rotating boundary force [6,16,36].…”

Section: B Effect Of Rotating On Global Quantities In Mixing Zonementioning

confidence: 57%

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Small-scale fluctuation and scaling law of mixing in three-dimensional rotating turbulent Rayleigh-Taylor instability

Wei

Wang

et al. 2022

Phys. Rev. E

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The effect of rotation on small-scale characteristics and scaling law in the mixing zone of the threedimensional turbulent Rayleigh-Taylor instability (RTI) is investigated by the lattice Boltzmann method at small Atwood number. The mixing zone width h(t ), the root mean square of small scale fluctuation, the spectra, and the structure functions are obtained to analyze the rotating effect. We mainly focus on the process of the development of plumes and discuss the physical mechanism in the mixing zone in rotating and nonrotating systems. The variation of kinetic energy spectra E u and temperature energy spectra E θ with the dimensionless rotation τ demonstrate the suppression effect of rotation. Two scaling laws between the mixing layer width h(t ) and dimensionless time t/τ are obtained at various Coriolis forces( √ h(t ) t 0.9 and √ h(t ) t 0.35 ). The rotation increasingly suppresses the growth of the mixing layer width h(t ). The velocity and temperature fluctuations are also suppressed by the rotation effect. The relation between the Nusselt number (Nu) and the Rayleigh number (Ra) indicates that the heat transfer is suppressed by the rotation effect in the rotating RT system. The width of the inertial subrange increasingly narrows with increasing τ .

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Section: B Effect Of Rotating On Global Quantities In Mixing Zonementioning

confidence: 57%

“…The functional relation between Nu and Ra has been widely studied by direct numerical simulations in the RT turbulence [2,4,36].…”

Section: B Effect Of Rotating On Global Quantities In Mixing Zonementioning

confidence: 99%

Small-scale fluctuation and scaling law of mixing in three-dimensional rotating turbulent Rayleigh-Taylor instability

Wei

Wang

et al. 2022

Phys. Rev. E

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“…Zen'kovskaya and Novosiadliy reported the high-frequency vibrational analyses for the case of immiscible two layer suspension [18]. Recently, an influence of time periodic alternating acceleration on the dynamics of Rayleigh-Taylor convection is carried out by Boffetta and co-workers where they utilized the numerically simulated Boussinesq equations [19].…”

Section: Introductionmentioning

confidence: 99%

An overstability analysis of vertically vibrated suspension of active swimmers subjected to thermal stratification

Kumar

Srikanth

2021

SN Appl. Sci.

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The present article focuses on the analytical approach to discuss the thermo–vibrational convection in a suspension of the active (gyrotactic) swimmers. The onset of instability criterion is investigated for the stationary and oscillatory modes of convection in a shallow fluid layer with no–slip and rigid–free walls. The eigenvalue problem is tackled by Galerkin scheme to get the desired stability diagram and the correlation between the critical Rayleigh numbers. The overstability in suspension is possible when the unstable density gradient of the gyrotactic particles is opposed by the density variation due to thermo–vibrational influence. The suspension is destabilized due to gyrotactic up–swimming while the increase in Péclet number stabilizes the system. The stabilizing influence of vertical vibration is considerably affected due to thermal gradient which destabilizes the suspension. An interesting result of this study is the influence of thermo–vibrational parameter which is associated with applied thermal and vibrational properties. We reported that the destabilizing nature of thermo–vibrational parameter becomes thermally or vibrationally governed when the suspension is heated or cooled from below. When compared to the rigid–rigid boundaries, the displayed profiles for rigid–free walls yielded less stableness in the suspension.

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“…As a result, increasing attention has been given in recent years to Rayleigh-Taylor instability undergoing variable acceleration (see, in particular, Refs. [15][16][17][18][19][20][21][22]).…”

Section: Introductionmentioning

confidence: 99%

“…[17], and more recently, a number of studies have considered repeated cycling between acceleration and deceleration, as reported in Ref. [20].…”

Section: Introductionmentioning

confidence: 99%

Rayleigh–Taylor Instability With Varying Periods of Zero Acceleration

Aslangil

Farley

Lawrie

et al. 2020

Journal of Fluids Engineering

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We present our findings from a numerical investigation of the acceleration-driven Rayleigh-Taylor Instability, modulated by varying periods without an applied acceleration field. It is well known from studies on shock-driven Richtmyer-Meshkov instability that mixing without external forcing grows with a scaling exponent as ~ t^{0.20-0.28}. When the Rayleigh-Taylor Instability is subjected to varying periods of "zero" acceleration, the structural changes to the mixing layer remain remarkably small. After the acceleration is re-applied, the mixing layer quickly resumes the profile of development it would have had if there had been no intermission. This behaviour contrasts in particular with the strong sensitivity that is found to other variable acceleration profiles examined previously in the literature.

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Suppression of Rayleigh-Taylor turbulence by time-periodic acceleration

Cited by 19 publications

References 35 publications

Small-scale fluctuation and scaling law of mixing in three-dimensional rotating turbulent Rayleigh-Taylor instability

Small-scale fluctuation and scaling law of mixing in three-dimensional rotating turbulent Rayleigh-Taylor instability

An overstability analysis of vertically vibrated suspension of active swimmers subjected to thermal stratification

Rayleigh–Taylor Instability With Varying Periods of Zero Acceleration

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