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Main Title: Lagrangian Statistics of Heat Transfer in Homogeneous Turbulence Driven by Boussinesq Convection
Author(s): Pratt, Jane
Busse, Angela
Müller, Wolf-Christian
Type: Article
Language Code: en
Abstract: The movement of heat in a convecting system is typically described by the nondimensional Nusselt number, which involves an average over both space and time. In direct numerical simulations of turbulent flows, there is considerable variation in the contributions to the Nusselt number, both because of local spatial variations due to plumes and because of intermittency in time. We develop a statistical approach to more completely describe the structure of heat transfer, using an exit-distance extracted from Lagrangian tracer particles, which we call the Lagrangian heat structure. In a comparison between simulations of homogeneous turbulence driven by Boussinesq convection, the Lagrangian heat structure reveals significant non-Gaussian character, as well as a clear trend with Prandtl number and Rayleigh number. This has encouraging implications for simulations performed with the goal of understanding turbulent convection in natural settings such as Earth’s atmosphere and oceans, as well as planetary and stellar dynamos.
Issue Date: 3-Aug-2020
Date Available: 9-Dec-2020
DDC Class: 530 Physik
Subject(s): Lagrangian transport
geophysical fluid flows
statistical methods
Journal Title: Fluids
Publisher: MDPI
Publisher Place: Basel
Volume: 5
Issue: 3
Article Number: 127
Publisher DOI: 10.3390/fluids5030127
EISSN: 2311-5521
Appears in Collections:Zentrum für Astronomie und Astrophysik » Publications

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