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Mittwoch, 13.07.2016, 17:15 Uhr, Raum SR 032, Arnimallee 6:

Dr. Tirtha Banerjee, Karlsruhe Institute of Technology (KIT), Institute of Meteorology and Climate Research (IMK-IFU), Garmisch-Partenkirchen,
Titel:
"Can a spectral theory explain the bulk properties of turbulent boundary layers?".
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Wednesday, 13th july, 2016, room  032, Arnimallee 6:

Dr. Tirtha Banerjee, Karlsruhe Institute of Technology (KIT), Institute of Meteorology and Climate Research (IMK-IFU), Garmisch-Partenkirchen

Title:
"Can a spectral theory explain the bulk properties of turbulent boundary layers?"

Abstract:
Logarithmic scaling of the mean longitudinal velocity in the equilibrium region of wall-bounded turbulence is a well-established result in the literature which has been verified by a plethora of experiments over decades. Recent high Reynolds number experiments have also suggested quasi-universal logarithmic scaling of the longitudinal turbulent velocity variance. However, there was a lack of theoretical justifications of the aforementioned bulk scaling laws which have been used time and again in various meteorological studies where parametrization of bulk turbulent statistics are necessary. A spectral budget model has been developed which explains the emergence of these scaling laws based on the distribution of turbulent kinetic energy across scales, i.e. spectral properties. Moreover, in presence of thermal stratification, applicability of standard similarity theories such as Monin Obukhov Similarity Theory (MOST) over the longitudinal velocity variance is a thorny issue. The proposed framework is shown to extend MOST for the turbulent velocity variance in presence of unstable and stable atmospheric stratification. The phenomenological theory also provides a unified theoretical framework by connecting seemingly separate theories in turbulence such as Townsend's attached eddy hypothesis, Kolmogorov's hypothesis, Heisenberg's eddy viscosity, MOST etc. as well as providing physical basis to a number of associated constants.

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Zielgruppe

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Termine / Orte
Datum Vortragende/r
27.04.2016 Gualtiero Badin, Institute of Oceanography, University of Hamburg
13.07.2016 Dr. Tirtha Banerjee, KIT Karlsruhe, Institute of Meteorology and Climate Research (IMK-IFU), Garmisch-Partenkirchen

Das Seminar findet an der FU-Berlin in der Arnimallee 6 im Raum SR 032 von 17:15 bis 18:45 Uhr statt.


Kontakt
Rupert Klein Arnimallee 6, Raum 135
Sekretariat: Ulrike Eickers, Arnimallee 6, Raum 134
Sprechstunde: nach Vereinbarung
e-mail: rupert.klein{at}math.fu-berlin.de