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Dense lagrangian particle tracking of turbulent rayleigh bénard convection in a cylindrical sample using Shake-The-Box

Bosbach, Johannes and Schanz, Daniel and Godbersen, Philipp and Schröder, Andreas (2019) Dense lagrangian particle tracking of turbulent rayleigh bénard convection in a cylindrical sample using Shake-The-Box. In: 17th European Turbulence Conference (ETC 2019) (631), p. 1. 17th European Turbulence Conference (ETC 2019), 3.-6. Sept. 2019, Torino, Italy.

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Official URL: http://www.etc17.it/

Abstract

We present spatially and temporally resolved velocity and acceleration measurements of turbulent Rayleigh-Bénard convection covering the complete volume of a cylindrical sample with aspect ratio one. Using the Shake-The-Box Lagrangian particle tracking algorithm, we are able to instantaneously track up to ~ 600,000 particles in the complete sample volume (~ 1 m³). The data assimilation scheme FlowFit with continuity and Navier-Stokes-constraints is used to interpolate the scattered velocity and acceleration data by continuous 3D B-Splines in a cubic grid, enabling to recover the smallest flow scales. The frame rate was chosen to be at least 7 times faster than the Kolmogorov time scale. In the presentation, we show Lagrangian and Eulerian visualizations of the large scale circulation (LSC) as well as small scale structures, such as thermal plumes and turbulent background fluctuations and unveil the dynamics of their complex interplay. Rare dynamic events, such as cessations and reo rientations of the LSC will be presented in addition to combined and conditioned Lagrangian and Eulerian statistics of turbulent quantities.

Item URL in elib:https://elib.dlr.de/129519/
Document Type:Conference or Workshop Item (Speech)
Additional Information:Session 3: TURBULENT CONVECTION
Title:Dense lagrangian particle tracking of turbulent rayleigh bénard convection in a cylindrical sample using Shake-The-Box
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bosbach, JohannesJohannes.Bosbach (at) dlr.dehttps://orcid.org/0000-0002-1531-127X
Schanz, Danieldaniel.schanz (at) dlr.deUNSPECIFIED
Godbersen, Philippphilipp.godbersen (at) dlr.deUNSPECIFIED
Schröder, Andreasandreas.schroeder (at) dlr.dehttps://orcid.org/0000-0002-6971-9262
Date:3 September 2019
Journal or Publication Title:17th European Turbulence Conference (ETC 2019)
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Page Range:p. 1
Editors:
EditorsEmail
Bofetta, GuidoUniversità di Torino
Tordella, DanielaPolitecnico di Torino
Series Name:Conference Proceedings on USB stick
Status:Published
Keywords:Rayleigh-Bénard Convection, Shake-The-Box, Lagrangian Particle Tracking, Helium Filled Soap Bubbles
Event Title:17th European Turbulence Conference (ETC 2019)
Event Location:Torino, Italy
Event Type:international Conference
Event Dates:3.-6. Sept. 2019
Organizer:Politecnico di Torino / Universita degli studi di Torino
Institution:Deutsches Zentrum für Luft- und Raumfahrt e.V.
Department:AS-EXV
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:fixed-wing aircraft
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Simulation and Validation
Location: Göttingen
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Experimental Methods, GO
Deposited By: Micknaus, Ilka
Deposited On:11 Oct 2019 15:44
Last Modified:11 Oct 2019 15:44

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