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Height-dependence of spatio-temporal spectra of wall-bounded turbulence : LES results and model predictions

Title data

Wilczek, Michael ; Stevens, Richard J. A. M. ; Meneveau, Charles:
Height-dependence of spatio-temporal spectra of wall-bounded turbulence : LES results and model predictions.
In: Journal of Turbulence. Vol. 16 (2015) Issue 10 . - pp. 937-949.
ISSN 1468-5248
DOI: https://doi.org/10.1080/14685248.2015.1047497

Abstract in another language

Wavenumber–frequency spectra of the streamwise velocity component obtained from large-eddy simulations (LES) are presented. Following recent work we show that the main features, a Doppler shift and a Doppler broadening of frequencies, are captured by an advection model based on the Tennekes–Kraichnan random-sweeping hypothesis with additional mean flow. In this paper, we focus on the height-dependence of the spectra within the logarithmic layer of the flow. We furthermore benchmark an analytical model spectrum that takes the predictions of the random-sweeping model as a starting point and find good agreement with the LES data. We also quantify the influence of the LES grid resolution on the wavenumber–frequency spectra.

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 12:45
Last Modified: 18 Feb 2022 12:45
URI: https://eref.uni-bayreuth.de/id/eprint/67615