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

Printausgabe
EUR 69,90

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EUR 49,90

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

Christian Bauer (Autor)

Vorschau

Leseprobe, PDF (290 KB)
Inhaltsverzeichnis, PDF (29 KB)

ISBN-13 (Printausgabe) 9783736973695
ISBN-13 (E-Book) 9783736963696
Sprache Englisch
Seitenanzahl 244
Umschlagkaschierung glänzend
Auflage 1
Erscheinungsort Göttingen
Promotionsort Ilmenau
Erscheinungsdatum 01.02.2021
Allgemeine Einordnung Dissertation
Fachbereiche Ingenieurwissenschaften
Technische Mechanik, Strömungsmechanik, Thermodynamik
Schlagwörter direct numerical simulation, turbulent pipe flow, small-scale motions, very-large-scale motions, turbulence, wall-bounded turbulence, boundary layer, coherent structures, velocity spikes, velocity streaks, high-order statistics, velocity correlation, one-point statistics, two-point statistics, convergence, scaling, Reynolds stresses, skewness, flatness, scale interaction, turbulent kinetic energy, inter-scale energy flux, energy budget, production, dissipation, diffusion, cut-off filter, finite-volume scheme, Leapfrog-Euler scheme, cylindrical coordinates, Navier-Stokes equation, near-wall cycle, outer-flow region, inner-flow region, Reynolds number dependence, domain length, backscattering, energy cascade, sweeps, ejections, Direkte numerische Simulation, Turbulente Rohrströmung, kleinskalige Strukturen, Superstrukturen, Turbulenz, Wandnahe Turbulenz, Grenzschichtströmung, Kohärente Strukturen, velocity spikes, velocity streaks, Höhere Ordnung Statistik, Geschwindigkeitskorrelationen, Ein-Punkt Statistik, Zwei-Punkt Statistik, Konvergenz, Skalierung, Reynolds-Spannungen, Schiefe, Flachheit, Skaleninteraktion, Turbulente kinetische Energie, Interskalenenergiefluss, Energiebilanz, Produktion, Dissipation, Diffusion, Cut-off Filter, Finite-Volumen Methode, Leapfrog-Euler Methode, Zylinderkoordinaten, Navier-Stokes Gleichung, Wandnaher Zyklus, Äußere Region, Innere Region, Reynoldszahlabhängigkeit, Domänengröße, backscattering, Energiekaskade, sweeps, ejections, Fluidbewegung, Fluid Motion, Strömungsgeometrie
URL zu externer Homepage https://scart.dlr.de/site/research-projects/direct-numerical-simulation-and-large-eddy-simulation-of-turbulent-pipe-and-channel-flows/index.htm
Beschreibung

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.