Rotation and confinement in turbulent Rayleigh-Bénard convection

Robert Hartmann

Research output: ThesisPhD 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 languageEnglish
QualificationDoctor of Philosophy
Awarding Institution
  • University of Twente
Supervisors/Advisors
  • Lohse, Detlef, Supervisor
  • Verzicco, Roberto, Co-Supervisor
  • Stevens, Richard J.A.M., Co-Supervisor
Award date6 Oct 2023
Place of PublicationEnschede
Publisher
Print ISBNs978-90-365-5825-9
Electronic ISBNs978-90-365-5826-6
DOIs
Publication statusPublished - 6 Oct 2023

Keywords

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

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