A number of studies have been conducted at the SLTEST site both prior to and during the development of the on-site infrastructure. Many of these have focused on the structure of the turbulence in the atmospheric surface layer, and/or the near-wall structure of boundary layer turbulence at high Reynolds number.Results shown here are for hot-wire based statistics of velocity and velocity gradients, cup and vane anemometer traces of wind direction and speed at 2m from the surface, and the surface layer mean profile (up to 200m) as derived from minisodar measurements.
Data Graphs and explanations:
One hour averaged surface layer mean profile as derived from Aerovironment minisodar. Data were acquired under near-neutral conditions.
Typical wind speed and direction time series as derived from a cup and vane anemometer under near-neutral conditions.
Inner normalized near-wall mean velocity profiles as compared to low Reynolds number data.
Inner normalized near-wall axial velocity fluctuation rms profiles as compared to low Reynolds number data.
Reynolds number dependence of peak inner normalized axial velocity fluctuation rms.
Two point correlation's of axial velocity fluctuations for wall-normal probe separations and the reference probe near the edge of the viscous sublayer. Present results are compared to results from low Reynolds number studies.
Near-wall inner normalized rms du/dy profiles, as compared to results from low Reynolds number studies.
Two point correlation's of du/dy (or spanwise vorticity) fluctuations for wall-normal probe separations and the reference probe near the edge of the viscous sublayer. Present results are compared to results from low Reynolds number studies.
Inner normalized velocity gradient data as derive from the 12-wire probe study of Folz (1997) (Ph.D dissertation University of Maryland, Department of Mechanical Engineering).
Inner normalized Reynolds stress profile as derive from the 12-wire probe study of Folz (1997) (Ph.D dissertation University of Maryland, Department of Mechanical Engineering).
Sublayer streak and pocket visualizations at the SLTEST site.
Measured sublayer low speed streak spacing in the atmospheric boundary layer as compared to existing low Reynolds number results.
