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Particle-resolved study of the onset of turbulence

Joshi, Eshita and Thoma, Markus H. and Schwabe, Mierk (2024) Particle-resolved study of the onset of turbulence. Physical Review Research, 6, L012013. American Physical Society. doi: 10.1103/PhysRevResearch.6.L012013. ISSN 2643-1564.

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Official URL: https://doi.org/10.1103/PhysRevResearch.6.L012013


The transition from laminar to turbulent flow is an immensely important topic that is still being studied. Here we show that complex plasmas, i.e., microparticles immersed in a low temperature plasma, make it possible to study the particle-resolved onset of turbulence under the influence of damping, a feat not possible with conventional systems. We performed three-dimensional (3D) molecular dynamics (MD) simulations of complex plasmas flowing past an obstacle and observed 3D turbulence in the wake and fore-wake region of this obstacle. We found that we could reliably trigger the onset of turbulence by changing key parameters such as the flow speed and particle charge, which can be controlled in experiments, and show that the transition to turbulence follows the conventional pathway involving the intermittent emergence of turbulent puffs. The power spectra for fully developed turbulence in our simulations followed the -5/3 power law of Kolmogorovian turbulence in both time and space. We demonstrate that turbulence in simulations with damping occurs after the formation of shock fronts, such as bow shocks and Mach cones. By reducing the strength of damping in the simulations, we could trigger a transition to turbulence in an undamped system. This work opens the pathway to detailed experimental and simulation studies of the onset of turbulence on the level of the carriers of the turbulent interactions, i.e., the microparticles.

Item URL in elib:https://elib.dlr.de/202219/
Document Type:Article
Additional Information:We acknowledge funding of this work in the framework of the Nachwuchsgruppenprogramm im DLR Geschäftsbereich Raumfahrt.
Title:Particle-resolved study of the onset of turbulence
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Thoma, Markus H.Justus-Liebig-Universität Gießen, Gießen, Germanyhttps://orcid.org/0000-0002-8816-9120UNSPECIFIED
Schwabe, MierkDLR, IPAhttps://orcid.org/0000-0001-6565-5890UNSPECIFIED
Date:18 January 2024
Journal or Publication Title:Physical Review Research
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In ISI Web of Science:Yes
Page Range:L012013
Publisher:American Physical Society
Keywords:onset of turbulence, particle-resolved turbulence, molecular-dynamics simulations
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:other
DLR - Research area:Raumfahrt
DLR - Program:R - no assignment
DLR - Research theme (Project):R - no assignment
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Materials Physics in Space
Institute of Atmospheric Physics > Earth System Model Evaluation and Analysis
Deposited By: Schwabe, Dr. Mierk
Deposited On:22 Jan 2024 07:42
Last Modified:22 Jan 2024 07:42

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