Measurements of the static pressure near the surface in the atmospheric boundary layer

Research output: Contribution to journalArticlepeer-review

Authors

External organisations

  • University of Auckland
  • University of Reading

Abstract

Measurements have been made of the three components of velocity and of the static pressure in the lowest 10 m of the atmospheric boundary layer. The measurements reported here were made on two occasions: the first with a single 10 m mast and the second with four 6 m masts. One-hour duration measurements at a sampling rate of 10 samples s−1 were processed for statistical properties including an assessment of the mean static pressure, and the time series processed for spectral properties. The mean velocity profile followed the expected boundary-layer log-region. An estimate of the mean static pressure compared to that above the boundary layer has been made and shows a dependency on the RMS (Root Mean Square) of dynamic pressure. The spectra of wind velocity and wind dynamic pressure follow the expected n−5/3 power-law decay rate in the inertial subrange, whereas static pressure spectra followed a decay rate close to n−4/3 - a result that was not predicted by published theory. Limited comparisons have been made with measurements from wind-tunnel boundary-layer flows, and with one other full-scale experiment. There is evidence from these comparisons that the static pressure spectra has a decay rate close to n−4/3 but there is also evidence of Reynolds-number sensitive. These measurements were made as part of a study of wind effects on buildings. The distinct spectral pattern of static pressure compared to that of dynamic pressure is a potential aid to identifying their separate contribution to wind loading and natural ventilation.

Bibliographic note

Funding Information: Figs. 12 and 13 have been reproduced from Albertson, JD, Kata, GG, Pariange, MB, Eichinger, WE. Spectral scaling of static pressure fluctuations in the atmospheric surface layer: The interaction between large and small scales. Physics of Fluids, Vol 10, No 7, July 1998 with the permission of AIP Publishing. The measurements in 2000 were part of the science programme conducted at Silsoe Research Institute, and funded by the BBSRC. The measurements in 2015/16 followed full-scale measurements made on the Silsoe site as part of the EPSRC funded Refresh Programme (Ref EP/K031893/1), and formed part of the contribution to the Programme by the University of Birmingham. Publisher Copyright: © 2020 Elsevier Ltd

Details

Original languageEnglish
Article number104487
Number of pages13
JournalJournal of Wind Engineering and Industrial Aerodynamics
Volume209
Early online date26 Dec 2020
Publication statusPublished - Feb 2021

Keywords

  • Boundary layer flow, Spectra, Static pressure, Turbulence