Rayleigh
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Related Articles from SNS
Rayleigh-Plateau instability of an elasto-viscoplastic filament
Announce Type: replace Abstract: A slender-thread model is used to explore the Rayleigh-Plateau instability of a filament of elasto-viscoplastic fluid. Without elasticity, a finite yield stress suppresses any linear instability for a filament of constant radius. Including sub-yield elastic deformation permits an elastic Rayleigh-Plateau instability above a critical Deborah number.
Multiple critical Froude numbers for the centrifugal effects on heat transport in rotating Rayleigh-B\'{e}nard convection
arXiv:2606.06116v1 Announce Type: new Abstract: The influence of centrifugal effects in rotating Rayleigh-Benard convection is investigated using direct numerical simulations. We find that the Nusselt number decreases beyond a critical Froude number, Fr_c*.
Subcritical transition to turbulence in buoyancy-driven flows with multiple hysteresis loops under quasi-one-dimensional confinement
arXiv:2605.31380v1 Announce Type: new Abstract: We present both static and quasi-static direct numerical simulations of Rayleigh-B\'enard convection in a quasi-one-dimensional domain, revealing for the first time a clear subcritical transition to turbulence in a buoyancy-driven flow. Within a narrow range of Rayleigh number (Ra), three coexisting flow states are identified: steady convection, oscillatory chaos, and intermittent turbulence. The transitions between these states are accompanied...
An experimental study on the heat transport in porous media convection
arXiv:2606.06331v1 Announce Type: new Abstract: We investigate the heat transport in porous media convection over a wide Rayleigh-- Darcy number range of $26.8\leq Ra\leq 2.62\times 10^5$, and a Darcy number range of $6.18\times10^{-7}\leq Da\leq 1.21\times 10^{-5}$. In the experiments, we employ 3D-printed lattice structures as the solid porous matrix and water as the working fluid.
Family of Mark Orabiyi honours 'beautiful spirit' who died after being found stabbed in Silvertown garden
Family of Mark Orabiyi honours 'beautiful spirit' who died after being found stabbed in Silvertown garden Mark Orabiyi, 35, was found with stab wounds in the garden of a property in Rayleigh Road, Silvertown, on Friday morning and was taken to hospital where he later died The relatives of a 35-year-old man who lost his life after being discovered with stab injuries in an east London garden have honoured a "beautiful spirit" who brought "love, light and joy" to everyone who crossed his path....
Physical Mechanism behind the Early Onset of the Ultimate State in Supergravitational Centrifugal Thermal Convection
arXiv:2509.14800v2 Announce Type: replace Abstract: We present a combined experimental and numerical investigation of the transition from the classical to the ultimate regime of thermal turbulence in a supergravitational centrifugal convection system. The transition is found to be robust, with the critical Rayleigh number decreasing systematically as the Froude number, defined as the ratio of centrifugal to Earth's gravity, decreases, highlighting the effect of residual gravity. Once the...
A Uniformly High-Accuracy PML-BIE Method for Scattering by Periodic Arrays of Obstacles: The 2D Case
arXiv:2606.07971v1 Announce Type: cross Abstract: This paper presents a novel frequency-robust perfectly matched layer (PML) boundary integral equation (BIE) method for solving two-dimensional electromagnetic scattering problems involving periodic arrays of obstacles. In periodic scattering problems, standard BIE formulations based on the quasi-periodic Green's function require the evaluation of lattice sums or challenging Sommerfeld-type integrals, which diverge at Rayleigh--Wood (RW)...
Influence of Aspect ratio in the Convection in Rotating Annulus In the Presence of Localized Heating
arXiv:2606.04151v1 Announce Type: new Abstract: Two-dimensional (2D) axisymmetric simulations are conducted to investigate convection in a rotating cylindrical annulus with localized heating at the outer bottom edge and uniform cooling at the inner cylindrical wall. The resulting radial and vertical temperature gradients generate buoyancy-driven motion and produce a stratification pattern relevant to atmospheric circulation. The effects of aspect ratio (\(\Gamma\)), Rayleigh number (\(Ra =...
Emergent Transfer of a Physics Foundation Model from Simulation to Laboratory Turbulence
arXiv:2606.01470v1 Announce Type: cross Abstract: Whether physics foundation models can be usefully deployed on laboratory experiments remains an open question for scientific machine learning (ML). We test this question on the Rayleigh-Taylor instability (RTI), a ubiquitous and demanding fluid instability seen from tabletop flows to supernova explosions, in which small perturbations at a density interface grow into chaotic, multiscale mixing as a lighter fluid accelerates into a heavier one....
Emergent Transfer of a Physics Foundation Model from Simulation to Laboratory Turbulence
arXiv:2606.01470v1 Announce Type: new Abstract: Whether physics foundation models can be usefully deployed on laboratory experiments remains an open question for scientific machine learning (ML). We test this question on the Rayleigh-Taylor instability (RTI), a ubiquitous and demanding fluid instability seen from tabletop flows to supernova explosions, in which small perturbations at a density interface grow into chaotic, multiscale mixing as a lighter fluid accelerates into a heavier one....