Bulletin of the American Physical Society
70th Annual Meeting of the APS Division of Fluid Dynamics
Volume 62, Number 14
Sunday–Tuesday, November 19–21, 2017; Denver, Colorado
Session B40: Awards Session: Presentation of Awards and DFD Fellowships (Otto LaPorte Lecture, Stanley Corrsin Award, Francois Frenkiel Award, Andreas Acrivos Dissertation Award) |
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Chair: Robert Moser, University of Texas; Alexander Smits, Princeton University; Karen Flack, US Naval Academy Room: Bellco Theatre |
Sunday, November 19, 2017 10:20AM - 10:55AM |
B40.00001: PRESENTATION OF AWARDS AND FELLOWSHIPS |
Sunday, November 19, 2017 10:55AM - 11:40AM |
B40.00002: Otto LaPorte Lecture: Ultimate Rayleigh-B\'enard and Taylor-Couette turbulence Invited Speaker: Detlef Lohse Rayleigh-B\'enard flow {\text ---} the flow in a box heated from below and cooled from above {\text ---} and Taylor-Couette flow {-}{-} the flow between two coaxial co- or counter-rotating cylinders {-}{-} are the two paradigmatic systems in physics of fluids and many new concepts have been tested with them. They are mathematically well defined, namely by the Navier-Stokes equations and the respective boundary conditions, and share many features.\\ \\While the low Reynolds number regime (i.e., weakly driven systems) has been very well explored in the '80s and '90s of the last century, in the fully turbulent regime major research activity only developed in the last two decades. In this talk we will first briefly review this recent progress in our understanding of fully developed Rayleigh-B\'enard (RB) and Taylor-Couette (TC) turbulence, from the experimental, theoretical, and numerical point of view. We will explain the parameter dependences of the global transport properties of the flow and the local flow organisation, including velocity profiles and boundary layers, which are closely connected to the global properties. Next, we will discuss transitions between different (turbulent) flow states. We will in particular focus on the so-called ultimate regime, in which the boundary layer has become turbulent, and which therefore has enhanced transport properties. In the mechanical driven TC flow this ultimate regime can also be achieved in our high-performance numerical simulations, showing excellent agreement with our experiments on the Twente Turbulent Taylor-Couette $(T^3C)$ facility. \\ \\In the last part of the talk we will discuss RB and TC turbulence with rough walls. There the results can be expressed in terms of the skin-friction factor, revealing analogy to turbulent flow in rough pipes. Finally, we will present our results on RB and TC flow with bubbles, focusing on bubbly drag reduction and its origin.\\ \\This is joint work with many colleagues over the years, and I in particular would like to name Chao Sun, Roberto Verzicco, Siegfried Grossmann, Richard Stevens, Erwin van der Poel, Rodolfo Ostilla-Monico, Xiaojue Zhu, Dennis van Gils, Sander Huisman, Ruben Verschoof, and Gert-Wim Bruggert. [Preview Abstract] |
Sunday, November 19, 2017 11:40AM - 12:25PM |
B40.00003: Stanley Corrsin Award Talk: The role of singularities in hydrodynamics Invited Speaker: Jens Eggers If a tap is opened slowly, a drop will form. The separation of the drop is described by a singularity of the Navier-Stokes equation with a free surface. Shock waves are singular solutions of the equations of ideal, compressible hydrodynamics. These examples show that singularities are characteristic for the tendency of the hydrodynamic equations to develop small scale features spontaneously, starting from smooth initial conditions. As a result, new structures are created, which form the building blocks of more complicated flows. The mathematical structure of singularities is self-similar, and their characteristics are fixed by universal properties. This will be illustrated by physical examples, as well as by applications to engineering problems such as printing, coating, or air entrainment. Finally, more recent developments will be discussed: the increasing complexity underlying the self-similar behavior of some singularities, and the spatial structure of shock waves. [Preview Abstract] |
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