elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

Revisiting the Higher-order Statistical Moments in Turbulent Pipe Flow using Direct Numerical Simulations

Bauer, Christian and Feldmann, Daniel and Wagner, Claus (2016) Revisiting the Higher-order Statistical Moments in Turbulent Pipe Flow using Direct Numerical Simulations. 20. DGLR-Fachsymposium der STAB, 08. - 09. Nov. 2016, Braunschweig, Deutschland.

[img] PDF - Registered users only
2MB

Official URL: https://www.tu-braunschweig.de/stab2016

Abstract

Direct numerical simulations (DNS) of turbulent pipe flow within a flow domain of L = 42R involving a friction Reynolds number of Rer = 180 and two different wall normal grid refinements have been carried out and investigated in terms of turbulent high-order statistics. The phenomenology of !arge local wall-normal velocity fluctuations (velocity spikes), is discussed through time series and instantaneous flow field realizations. Due to their rare appearance both in space and time, statistical high-order moments take long time to converge. A convergence study is performed and for fully converged statistics the sensitivity of the wall-normal kurtosis value on the wall is investigated. The fourth order moment of wall-normal velocity needs to be integrated at least t:,. r + = 2.4 · 10"11 units of an averaging coordinate in time and space to obtain a fully converged flatness value in the very vicinity of the wall. Furthermore, a wall-near grid spacing of t:,. r+ = 0.11 was found to be insufficient to fully satisfy the no-slip boundary condition in terms of wall-normal flatness.

Item URL in elib:https://elib.dlr.de/110509/
Document Type:Conference or Workshop Item (Speech)
Title:Revisiting the Higher-order Statistical Moments in Turbulent Pipe Flow using Direct Numerical Simulations
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bauer, ChristianChristian.Bauer (at) dlr.deUNSPECIFIED
Feldmann, DanielDaniel.Feldmann (at) dlr.deUNSPECIFIED
Wagner, ClausClaus.Wagner (at) dlr.deUNSPECIFIED
Date:2016
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Turbulenz, DNS, Rohrströmung
Event Title:20. DGLR-Fachsymposium der STAB
Event Location:Braunschweig, Deutschland
Event Type:national Conference
Event Dates:08. - 09. Nov. 2016
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: Bachmann, Barbara
Deposited On:12 Jan 2017 16:19
Last Modified:12 Oct 2017 07:53

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.