Direct numerical simulations of Taylor-Couette turbulence: dynamics of the fully rough regime

ORAL

Abstract

Due to its abundance in nature and industry, the study of turbulent flows over rough surfaces is of paramount importance. The key question is how any rough geometry maps to its fluid dynamic behavior. However, the study of open systems is hampered by accurate measurements of the skin-friction drag and the presence of very long spatial structures. In this research, we employ Direct Numerical Simulations (DNSs) of a closed system, Taylor-Couette flow. Whereas before we have focused on transitionally rough surfaces, here we focus on the local and global fluid flow response over fully rough surfaces. In particular we study the azimuthal (streamwise) velocity and angular velocity profiles for varying friction Reynolds number and constant viscous roughness heights.

–

Presenters

  • Pieter Berghout

    Univ of Twente

Authors

  • Pieter Berghout

    Univ of Twente

  • Xiaojue Zhu

    University of Twente , Harvard University, Univ of Twente, University of Twente

  • Daniel Chung

    Univ of Melbourne, The University of Melbourne, University of Melbourne

  • Roberto Verzicco

    Univ of Roma, University of Rome, Università di Roma Tor Vergata, PoF University of Twente, Univ of Roma Tor Vergata, Univ. of Twente, University of Roma, Univ of Roma "Tor Vergata", University of Roma, University of Twente, Univ of Twente, Univ of Rome 'Tor Vergata'

  • Richard Stevens

    University of Twente, Univ of Twente

  • Detlef Lohse

    University of Twente, Physics of Fluids and Max Planck Center for Complex Fluids Dynamics, University of Twente, Enschede, The Netherlands, Univ of Twente, Univ of Twente, Max Plank Institute for Dynamics and Self-Organization, Twente Tech Univ, University of Twente, Max Planck Center for complex fluid dynamics