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Capturing Velocity Gradients and Particle Rotation Rates in Turbulence

Title data

Leppin, Leonhard A. ; Wilczek, Michael:
Capturing Velocity Gradients and Particle Rotation Rates in Turbulence.
In: Physical Review Letters. Vol. 125 (2020) Issue 22 . - No. 224501.
ISSN 1079-7114
DOI: https://doi.org/10.1103/PhysRevLett.125.224501

Abstract in another language

Turbulent fluid flows exhibit a complex small-scale structure with frequently occurring extreme velocity gradients. Particles probing such swirling and straining regions respond with an intricate, shape-dependent orientational dynamics, which sensitively depends on the particle history. Here, we systematically develop a reduced-order model for the small-scale dynamics of turbulence, which captures the velocity gradient statistics along particle paths. An analysis of the resulting stochastic dynamical system allows pinpointing the emergence of non-Gaussian statistics and non-trivial temporal correlations of vorticity and strain, as previously reported from experiments and simulations. Based on these insights, we use our model to predict the orientational statistics of anisotropic particles in turbulence, enabling a host of modeling applications for complex particulate flows.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics > Chair Theoretical Physics I > Chair Theoretical Physics I - Univ.-Prof. Dr. Michael Wilczek
Profile Fields > Advanced Fields > Nonlinear Dynamics
Result of work at the UBT: No
DDC Subjects: 500 Science > 530 Physics
Date Deposited: 18 Feb 2022 12:22
Last Modified: 18 Feb 2022 12:22
URI: https://eref.uni-bayreuth.de/id/eprint/67607