Elucidating inhomogeneous scale-dependent flow statistics within regular obstacle arrays
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
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Original language | English |
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Article number | 105101 |
Journal / Publication | Physics of Fluids |
Volume | 33 |
Issue number | 10 |
Online published | 1 Oct 2021 |
Publication status | Published - Oct 2021 |
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DOI | DOI |
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Link to Scopus | https://www.scopus.com/record/display.uri?eid=2-s2.0-85116519361&origin=recordpage |
Permanent Link | https://scholars.cityu.edu.hk/en/publications/publication(22315d54-612a-4e0d-8244-25d3637a1526).html |
Abstract
Scale-dependent turbulence statistics are calculated for large-eddy simulations of flow over square and staggered obstacle arrays. Using two-dimensional wavelet spectra, kinetic energy and transfer spectra are obtained inside the canopy layer. Mean energy spectra show a -5/3 range that extends across the obstacle scale with a large-scale peak that depends on the array type. Mean transfer spectra indicate energy extraction at large scales for the square array, but extraction or injection for the staggered array. Averaging over fluid and obstacles does not introduce significant artifacts. Mean lengthscales show minimal dependence on the array type or horizontal position; however, spatial variability is large for both arrays, especially for the energy transfer. Probability distributions for different repeating units formed by the arrays reveal that outliers exert a disproportionate influence on the cumulative energy transfer.
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Elucidating inhomogeneous scale-dependent flow statistics within regular obstacle arrays. / Liu, W.; Lau, G. E.; Ngan, K.
In: Physics of Fluids, Vol. 33, No. 10, 105101, 10.2021.
In: Physics of Fluids, Vol. 33, No. 10, 105101, 10.2021.
Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review
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