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Direct Numerical Simulation of Very-Large-Scale Motions in Turbulent Pipe Flow

Bauer, Christian (2021) Direct Numerical Simulation of Very-Large-Scale Motions in Turbulent Pipe Flow. Dissertation, Technische Universität Ilmenau.

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Official URL: https://cuvillier.de/de/shop/publications/8386-direct-numerical-simulation-of-very-large-scale-motions-in-turbulent-pipe-flow

Abstract

Turbulent pipe flow is not only of importance to engineering applications but also of fundamental interest to the study of wall-bounded turbulence. In the present work, the interaction of the so-called very-large-scale motions (VLSMs) with the near-wall, small-scale turbulence is explored by means of direct numerical simulation for friction Reynolds numbers up to Reτ = 2880 and pipe lengths up to L = 42R. Besides, the convergence and the scaling of different order moments of the velocity distribution are studied and also discussed with regard to VLSMs. The subsequent analysis of the streamwise energy budget equation of the filtered velocity field reveals that VLSMs obtain their energy from the mean velocity field via a production mechanism similar to the one known from the near-wall cycle. Moreover, the different energy budget terms are investigated by means of statistical averages, instantaneous flow field visualisations, and three-dimensional correlations, wherein the backscattering phenomenon is also dealt with. In brief, the research sheds new light on our understanding of the interaction between VLSMs and the near-wall cycle and leads to a better grasp of turbulent pipe flow in general.

Item URL in elib:https://elib.dlr.de/141019/
Document Type:Thesis (Dissertation)
Additional Information:ISBN-13 (Printausgabe) 9783736973695 ISBN-13 (E-Book) 9783736963696
Title:Direct Numerical Simulation of Very-Large-Scale Motions in Turbulent Pipe Flow
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Bauer, ChristianChristian.Bauer (at) dlr.dehttps://orcid.org/0000-0003-1838-6194
Date:8 February 2021
Journal or Publication Title:Cuvillier Verlag
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Number of Pages:244
Status:Published
Keywords:direct numerical simulation, turbulent pipe flow, very-large-scale motions, wall-bounded turbulence, coherent structures, high-order statistics, energy flux
Institution:Technische Universität Ilmenau
Department:Institute of Thermodynamics and Fluid Mechanics
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Rail Transport
DLR - Research area:Transport
DLR - Program:V SC Schienenverkehr
DLR - Research theme (Project):V - NGT BIT
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Ground Vehicles
Deposited By: Bauer, Christian
Deposited On:23 Feb 2021 17:22
Last Modified:23 Feb 2021 17:22

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