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of 24
pro vyhledávání: '"76F35"'
Autor:
Bleitner, Fabian
Publikováno v:
Doctoral Dissertation, Staats- und Universit\"atsbibliothek Hamburg Carl von Ossietzky, 2024
In this dissertation two-dimensional buoyancy-driven flows are investigated. While usually the Navier-Stokes equations are equipped with no-slip boundary conditions here we focus on the Navier-slip conditions that, depending on the system at hand, be
Externí odkaz:
http://arxiv.org/abs/2409.14230
Autor:
Ephrati, Sagy
A framework for deriving probabilistic data-driven closure models is proposed for coarse-grained numerical simulations of turbulence in statistically stationary state. The approach unites the ideal large-eddy simulation model and data assimilation me
Externí odkaz:
http://arxiv.org/abs/2408.14838
Autor:
Bleitner, Fabian, Nobili, Camilla
Publikováno v:
Journal of Fluid Mechanics 998 (2024) A24
We consider the two-dimensional Rayeigh-B\'enard convection problem between Navier-slip fixed-temperature boundary conditions and present a new upper bound for the Nusselt number. The result, based on a localization principle for the Nusselt number a
Externí odkaz:
http://arxiv.org/abs/2404.14936
There is growing interest in discovering interpretable, closed-form equations for subgrid-scale (SGS) closures/parameterizations of complex processes in Earth systems. Here, we apply a common equation-discovery technique with expansive libraries to l
Externí odkaz:
http://arxiv.org/abs/2306.05014
Publikováno v:
Journal of Fluid Mechanics. 2023;975:A35
A data-driven turbulence model for coarse-grained numerical simulations of two-dimensional Rayleigh-B\'enard convection is proposed. The model starts from high-fidelity data and is based on adjusting the Fourier coefficients of the numerical solution
Externí odkaz:
http://arxiv.org/abs/2305.10043
The Cassini and Juno probes have revealed large coherent cyclonic vortices in the polar regions of Saturn and Jupiter, a dramatic contrast from the east-west banded jet structure seen at lower latitudes. Debate has centered on whether the jets are sh
Externí odkaz:
http://arxiv.org/abs/2006.14817
Autor:
Klein, Marten, Schmidt, Heiko
The Rayleigh number $Ra$ dependence of the Nusselt number $Nu$ in turbulent Rayleigh--B\'enard convection is numerically investigated for a moderate and low Prandtl number, $Pr=0.7$ and $0.021$, respectively. Here we specifically address the case of
Externí odkaz:
http://arxiv.org/abs/1906.06621
The Rayleigh-B\'enard system with stress-free boundary conditions is shown to have a global attractor in each affine space where velocity has fixed spatial average. The physical problem is shown to be equivalent to one with periodic boundary conditio
Externí odkaz:
http://arxiv.org/abs/1905.01399
Autor:
Vashishtha, Sumit, Verma, Mahendra K.
Publikováno v:
Phys. Rev. E 98, 043109 (2018)
In this paper we employ renormalized viscosity and thermal diffusivity to construct a subgrid-scale model for large eddy simulation (LES) of turbulent thermal convection. For LES, we add $\nu_\mathrm{ren} \propto \Pi_u^{1/3} (\pi/\Delta)^{-1/3}$ to t
Externí odkaz:
http://arxiv.org/abs/1806.05916
Publikováno v:
BHATTACHARYA, S., PANDEY, A.,KUMAR, A., AND VERMA, M. K., "Complexity of viscous dissipation in turbulent thermal convection". Physics of Fluids 30, 3 (2018), 031702
Using direct numerical simulations of turbulent thermal convection for Rayleigh number ($\mathrm{Ra}$) between $10^6$ and $10^8$ and unit Prandtl number, we derive scaling relations for viscous dissipation in the bulk and in the boundary layers. We s
Externí odkaz:
http://arxiv.org/abs/1801.01701