Rotation and confinement in turbulent Rayleigh-Bénard convection

Robert Hartmann

doi:10.3990/1.9789036558266

Rotation and confinement in turbulent Rayleigh-Bénard convection

Robert Hartmann

Physics of Fluids

Research output: Thesis › PhD Thesis - Research UT, graduation UT

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Abstract

This dissertation investigates the heat transport and its enhancement in rotating Rayleigh-Bénard convection and confined Rayleigh-Bénard convection in various geometries by the use of direct numerical simulations. The geometries range from slender cuboid boxes and cylinders to wide periodic domains to spherical shells. The recurring finding in all geometries is the presence of vertically coherent structures in the bulk for the largest heat transport enhancement. Overall, this thesis shows that, by allowing for an efficient heat transport through the bulk, such vertically coherent flow structures are the second key factor to enhance the heat transport - besides the influence of the ratio of thermal and kinetic boundary layer thicknesses.

Original language	English
Qualification	Doctor of Philosophy
Awarding Institution	University of Twente
Supervisors/Advisors	Lohse, Detlef, Supervisor Verzicco, Roberto, Co-Supervisor Stevens, Richard J.A.M., Co-Supervisor
Award date	6 Oct 2023
Place of Publication	Enschede
Publisher	University of Twente
Print ISBNs	978-90-365-5825-9
Electronic ISBNs	978-90-365-5826-6
DOIs	https://doi.org/10.3990/1.9789036558266
Publication status	Published - 6 Oct 2023

Keywords

Thermal convection
Rotating flows
Heat transfer
Turbulence
Computational fluid dynamics (CFD)
Direct numerical simulations (DNS)

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PhDthesis_RobertHartmannFinal published version, 232 MB

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title = "Rotation and confinement in turbulent Rayleigh-B{\'e}nard convection",

abstract = "This dissertation investigates the heat transport and its enhancement in rotating Rayleigh-B{\'e}nard convection and confined Rayleigh-B{\'e}nard convection in various geometries by the use of direct numerical simulations. The geometries range from slender cuboid boxes and cylinders to wide periodic domains to spherical shells. The recurring finding in all geometries is the presence of vertically coherent structures in the bulk for the largest heat transport enhancement. Overall, this thesis shows that, by allowing for an efficient heat transport through the bulk, such vertically coherent flow structures are the second key factor to enhance the heat transport - besides the influence of the ratio of thermal and kinetic boundary layer thicknesses.",

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T1 - Rotation and confinement in turbulent Rayleigh-Bénard convection

AU - Hartmann, Robert

PY - 2023/10/6

Y1 - 2023/10/6

N2 - This dissertation investigates the heat transport and its enhancement in rotating Rayleigh-Bénard convection and confined Rayleigh-Bénard convection in various geometries by the use of direct numerical simulations. The geometries range from slender cuboid boxes and cylinders to wide periodic domains to spherical shells. The recurring finding in all geometries is the presence of vertically coherent structures in the bulk for the largest heat transport enhancement. Overall, this thesis shows that, by allowing for an efficient heat transport through the bulk, such vertically coherent flow structures are the second key factor to enhance the heat transport - besides the influence of the ratio of thermal and kinetic boundary layer thicknesses.

AB - This dissertation investigates the heat transport and its enhancement in rotating Rayleigh-Bénard convection and confined Rayleigh-Bénard convection in various geometries by the use of direct numerical simulations. The geometries range from slender cuboid boxes and cylinders to wide periodic domains to spherical shells. The recurring finding in all geometries is the presence of vertically coherent structures in the bulk for the largest heat transport enhancement. Overall, this thesis shows that, by allowing for an efficient heat transport through the bulk, such vertically coherent flow structures are the second key factor to enhance the heat transport - besides the influence of the ratio of thermal and kinetic boundary layer thicknesses.

KW - Thermal convection

KW - Rotating flows

KW - Heat transfer

KW - Turbulence

KW - Computational fluid dynamics (CFD)

KW - Direct numerical simulations (DNS)

U2 - 10.3990/1.9789036558266

DO - 10.3990/1.9789036558266

M3 - PhD Thesis - Research UT, graduation UT

SN - 978-90-365-5825-9

PB - University of Twente

CY - Enschede

ER -

Rotation and confinement in turbulent Rayleigh-Bénard convection

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Keywords

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