ORCID Profile
0000-0003-4364-0211
Current Organisation
University of California, San Diego
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Publisher: Informa UK Limited
Date: 10-2006
Publisher: Elsevier BV
Date: 05-2017
Publisher: American Meteorological Society
Date: 09-2004
Publisher: Elsevier BV
Date: 03-2019
Publisher: Springer Science and Business Media LLC
Date: 2005
Publisher: Elsevier BV
Date: 06-2017
Publisher: Springer Science and Business Media LLC
Date: 07-03-2018
Publisher: Springer Science and Business Media LLC
Date: 14-10-2018
Publisher: Elsevier BV
Date: 08-2023
Publisher: American Meteorological Society
Date: 08-2007
DOI: 10.1175/JAS3989.1
Abstract: Particle image velocimetry (PIV) measurements just within and above a mature corn canopy have been performed to clarify the small-scale spatial structure of the turbulence. The smallest resolved scales are about 15 times the Kolmogorov length scale (η ≈ 0.4 mm), the Taylor microscales are about 100η, and the Taylor scale Reynolds numbers range between R λ = 2000 and 3000. The vertical profiles of mean flow and turbulence parameters match those found in previous studies. Frequency spectra, obtained using the data as time series, are combined with instantaneous spatial spectra to resolve more than five orders of magnitude of length scales. They display an inertial range spanning three decades. However, the small-scale turbulence in the dissipation range exhibits anisotropy at all measurement heights, in spite of apparent agreement with conditions for reaching local isotropy, following a high-Reynolds-number wind tunnel study. Directly calculated subgrid-scale (SGS) energy flux, determined by spatially filtering the PIV data, increases significantly with decreasing filter size, providing support for the existence of a spectral shortcut that bypasses the cascading process and injects energy directly into small scales. The highest measured SGS flux is about 40% of the estimated energy cascading rate as determined from a −5/3 fit to the spectra. Terms appearing in the turbulent kinetic energy budget that can be calculated from the PIV data are in agreement with previous results. Evidence of a very strong correlation between dissipation rate and out-of-plane component of the vorticity is demonstrated by a striking similarity between their time series.
Publisher: American Meteorological Society
Date: 07-2004
Publisher: American Geophysical Union (AGU)
Date: 06-2006
DOI: 10.1029/2005WR004685
Publisher: Elsevier BV
Date: 11-2020
Publisher: American Geophysical Union (AGU)
Date: 06-2006
DOI: 10.1029/2005WR004651
Publisher: American Meteorological Society
Date: 10-2003
Location: United States of America
No related grants have been discovered for Jan Kleissl.