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Analysis of the Energy Budget of the Largest Scales in Turbulent Pipe Flow

Bauer, Christian and Wagner, Claus (2018) Analysis of the Energy Budget of the Largest Scales in Turbulent Pipe Flow. Interdisciplinary Turbulence Initiative (iTi 2018), 05.-07. Sep. 2018, Bertinoro, Italien.

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Official URL: https://www.fdy.tu-darmstadt.de/iti

Abstract

Very-large-scale motions (VLSM) become increasingly energetic with higher Reynolds numbers in turbulent pipe flow and contribute to the turbulent kinetic energy. Although several investigations regarding energy mechanisms in wall-bounded turbulence were carried out in the past, the origin of the energy at the largest wavelengths has not been studied rigorously, yet. Consequently, the aim of this work is to identify sources and sinks in the energy budget of the largest scales in turbulent pipe flow. Moreover, the energy transport mechanisms from and towards the largest scales of turbulent motion are to be elucidated. We carried out a direct numerical simulation (DNS) of turbulent pipe flow at friction Reynolds number of $Re_\tau = 1500$, based on the friction velocity $u_\tau$ , the pipe radius R and the kinematic viscosity $\nu$. The analyis focusses on the streamwise Reynolds stress budget of the low-pass filtered velocity, since VLSM appear first in the streamwise velocity component and they are much less energetic than the near-wall motions. At the conference the production, transfer and dissipation of turbulent energy at the largest scales will be presented by means of one- and two-point statistics as well as instantaneous flow field realisations.

Item URL in elib:https://elib.dlr.de/120906/
Document Type:Conference or Workshop Item (Speech)
Title:Analysis of the Energy Budget of the Largest Scales in Turbulent Pipe Flow
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bauer, ChristianChristian.Bauer (at) dlr.dehttps://orcid.org/0000-0003-1838-6194
Wagner, Clausclaus.wagner (at) dlr.deUNSPECIFIED
Date:7 September 2018
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Turbulent Pipe Flow, Direct Numerical Simulation
Event Title:Interdisciplinary Turbulence Initiative (iTi 2018)
Event Location:Bertinoro, Italien
Event Type:international Conference
Event Dates:05.-07. Sep. 2018
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles (old)
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - Next Generation Train III (old)
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Fluid Systems, GO
Deposited By: Bauer, Christian
Deposited On:19 Sep 2018 09:11
Last Modified:19 Sep 2018 09:11

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