Zobrazeno 1 - 10
of 48
pro vyhledávání: '"van Kan, Adrian"'
Geophysical and astrophysical fluid flows are typically buoyantly driven and are strongly constrained by planetary rotation at large scales. Rapidly rotating Rayleigh-B\'enard convection (RRRBC) provides a paradigm for direct numerical simulations (D
Externí odkaz:
http://arxiv.org/abs/2409.08536
Autor:
van Kan, Adrian
Turbulence is a widely observed state of fluid flows, characterized by complex, nonlinear interactions between motions across a broad spectrum of length and time scales. While turbulence is ubiquitous, from teacups to planetary atmospheres, oceans an
Externí odkaz:
http://arxiv.org/abs/2408.02844
Two-dimensional (2D) turbulence features an inverse energy cascade that produces large-scale flow structures such as large-scale vortices (LSVs) and unidirectional jets. We investigate the dynamics of such structures using extensive direct numerical
Externí odkaz:
http://arxiv.org/abs/2311.07863
The cubic-quintic Swift-Hohenberg equation (SH35) has been proposed as an order parameter description of several convective systems with reflection symmetry in the layer midplane, including binary fluid convection. We use numerical continuation, toge
Externí odkaz:
http://arxiv.org/abs/2303.00798
Autor:
van Kan, Adrian, Pétrélis, François
On-off intermittency occurs in nonequilibrium physical systems close to bifurcation points and is characterised by an aperiodic switching between a large-amplitude "on" state and a small-amplitude "off" state. L\'evy on-off intermittency is a recentl
Externí odkaz:
http://arxiv.org/abs/2210.10197
Instabilities of fluid flows often generate turbulence. Using extensive direct numerical simulations, we study two-dimensional turbulence driven by a wavenumber-localised instability superposed on stochastic forcing, in contrast to previous studies o
Externí odkaz:
http://arxiv.org/abs/2206.12355
In many geophysical and astrophysical flows, suppression of fluctuations along one direction of the flow drives a quasi-2D upscale flux of kinetic energy, leading to the formation of strong vortex condensates at the largest scales. Recent studies hav
Externí odkaz:
http://arxiv.org/abs/2201.00278
Basin stability (BS) is a measure of nonlinear stability in multi-stable dynamical systems. BS has previously been estimated using Monte-Carlo simulations, which requires the explicit knowledge of a dynamical model. We discuss the requirements for es
Externí odkaz:
http://arxiv.org/abs/2112.03260
Autor:
van Kan, Adrian, Alexakis, Alexandros
We study forced, rapildy rotating and stably stratified turbulence in an elongated domain using an asymptotic expansion at simultaneously low Rossby number $Ro\ll1$ and large domain height compared to the energy injection scale, $h=H/\ell_{in}\gg1$.
Externí odkaz:
http://arxiv.org/abs/2106.06973
This paper presents a geometric microcanonical ensemble perspective on two-dimensional Truncated Euler flows, which contain a finite number of (Fourier) modes and conserve energy and enstrophy. We explicitly perform phase space volume integrals over
Externí odkaz:
http://arxiv.org/abs/2104.11282