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Measuring the Full Velocity Gradient and Dissipation Rate Tensor in Homogeneous Turbulence using Shake-The-Box and FlowFit

Schröder, Andreas and Schanz, Daniel and Gesemann, Sebastian and Huhn, Florian and Paz, Daniel Garaboa and Perez-Munuzuri, Vicente and Bodenschatz, Eberhard (2019) Measuring the Full Velocity Gradient and Dissipation Rate Tensor in Homogeneous Turbulence using Shake-The-Box and FlowFit. In: 17th European Turbulence Conference 2019 (418), p. 1. 17th European Turbulence Conference, 03.-06.09.2019, Turin, Italy.

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Official URL: http://www.symposium.it/en/events/2019/etc-2019


We present measurements of the full velocity gradient and dissipation rate tensor based on dense fields of fluid particle trajectories in homogeneous turbulence at Rel~270 and ~350 in a von Kármán flow between two counter-rotating propellers. Applying the Shake-The-Box (STB) particle tracking algorithm, we are able to instantaneously track up to ~100.000 particles in a measurement volume of 50 x 50 x 15 mm³. The mean inter-particle distance is lower than 7 Kolmogorov lengths. 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 (locally) the smallest flow scales. In the presentation, we show Lagrangian velocity, acceleration and jolt statistics, as well as the Eulerian counterparts on velocity and pressure gradients with respective Q-R-diagrams, compute the energy dissipation rate directly by using local velocity gradient information gained by FlowFit at midpoints of particle tetrahedra in close proximity of a few Kolmogorov lengths and compare it to known indirect approaches.

Item URL in elib:https://elib.dlr.de/129728/
Document Type:Conference or Workshop Item (Speech)
Additional Information:INTERMITTENCY AND SCALING • Session 3
Title:Measuring the Full Velocity Gradient and Dissipation Rate Tensor in Homogeneous Turbulence using Shake-The-Box and FlowFit
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Schröder, Andreasandreas.schroeder (at) dlr.dehttps://orcid.org/0000-0002-6971-9262
Schanz, Danieldaniel.schanz (at) dlr.deUNSPECIFIED
Gesemann, Sebastiansebastian.gesemann (at) dlr.deUNSPECIFIED
Huhn, Florianflorian.huhn (at) gmx.deUNSPECIFIED
Paz, Daniel Garaboaangeldaniel.garaboa (at) usc.esUNSPECIFIED
Perez-Munuzuri, Vicentevicente.perez.munuzuri (at) usc.esUNSPECIFIED
Bodenschatz, Eberhardeberhard.bodenschatz (at) ds.mpg.deUNSPECIFIED
Date:September 2019
Journal or Publication Title:17th European Turbulence Conference 2019
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:No
Page Range:p. 1
Bofetta, GuidoUniverstà di Torino
Tordella, DanielaPolitecnico di Torino
Series Name:Conference Proceedings online
Keywords:Three-dimensional Lagrangian Particle Tracking (LPT), Shake-The-Box (STB), Turbulence
Event Title:17th European Turbulence Conference
Event Location:Turin, Italy
Event Type:international Conference
Event Dates:03.-06.09.2019
Institution:Deutsches Zentrum für Luft- und Raumfahrt e.V.
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:23 Oct 2019 15:55
Last Modified:23 Oct 2019 15:55

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