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Session: Vortex Dynamics 1
Session starts: Tuesday 25 August, 10:30
Presentation starts: 11:00
Room: Room A

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Anastasiya Kolchynska (Department of Mechanical Engineering, Technische Universität Ilmenau, Ilmenau, Germany)
Vinodh Bandaru (Department of Mechanical Engineering, Technische Universität Ilmenau, Ilmenau, Germany)
Janet Scheel (Department of Physics, Occidental College Los Angeles, Los Angeles, USA)
Jörg Schumacher (Department of Mechanical Engineering, Technische Universität Ilmenau, Ilmenau, Germany)

Abstract:
The dynamics of the boundary layers of temperature and velocity are the key to deeper understanding of turbulent transport of heat and momentum in thermal convection. Here, the structure of the skin friction field at the bottom and top plates of a Rayleigh-B\'{e}nard convection setup is investigated. We therefore analyze data obtained in direct numerical simulations of Rayleigh-B\'{e}nard convection in a cylindrical cell of aspect ratio $\Gamma = 1$. Our analysis is focused to critical points of the two-dimensional skin friction field at the walls. We analyze the statistics of the critical points and relate them to the thermal plumes which detach from the wall and move up into bulk.