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On the applicability of Taylor's hypothesis, including small sampling velocities

Published online by Cambridge University Press:  03 December 2021

Hans L. Pécseli Open the ORCID record for Hans L. Pécseli [Opens in a new window]  and
Jan K. Trulsen Open the ORCID record for Jan K. Trulsen [Opens in a new window]
Hans L. Pécseli*
Affiliation:
Physics Department, University of Oslo, N-0316Oslo, Norway Department of Physics and Technology, Arctic University of Norway, N-9037Tromsø, Norway
Jan K. Trulsen
Affiliation:
Institute for Theoretical Astrophysics, University of Oslo, N-0315Oslo, Norway
*
†Email address for correspondence: [email protected]
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Abstract

Taylor's hypothesis, or the frozen turbulence approximation, can be used to estimate also the specific energy dissipation rate $\epsilon$ by comparing experimental results with the Kolmogorov–Obukhov expression. The hypothesis assumes that a frequency detected by an instrument moving with a constant large velocity $V$ can be related to a wavenumber by $\omega = k V$. It is, however, not obvious how large the translational velocity has to be in order to make the hypothesis valid, or at least applicable with some acceptable uncertainty. Using the space–time-varying structure function for homogeneous and isotropic conditions, this question is addressed in the present study with emphasis on small velocities $V$. The structure function is obtained using results from numerical solutions of the Navier–Stokes equation. Particular attention is given to the $V$ variation of the estimated specific energy dissipation, $\epsilon _{est}$, compared with the actual value, $\epsilon$, used in the numerical calculations. In contrast to previous studies, the results emphasize velocities $V$ less than or comparable to the one-component root-mean-square velocity, $u_{rms}$. We find that $\epsilon$ can be determined to an acceptable accuracy for $V \geq 0.3\,u_{rms}$. A simple analytical model is suggested to explain the main features of the observations, both Eulerian and Lagrangian. The model assumes that the observed time variations are solely due to eddies moving past the observer, thus ignoring eddy deformation and intermittency effects. In spite of these simplifications, the analysis accounts for most of the numerical results when also eddy-size-dependent velocities are accounted for.

JFM classification

Turbulent Flows: Turbulence simulation Turbulent Flows: Turbulence modelling
Type
JFM Papers
Information
Journal of Fluid Mechanics , Volume 932 , 10 February 2022 , A22
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Copyright
© The Author(s), 2021. Published by Cambridge University Press

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