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How long is long enough when measuring fluxes and other turbulence statistics
Abstract It is determined how long a time series must be to estimate covariances and moments up to fourth order with a specified statistical significance. For a given averaging time T there is a
The spatial structure of neutral atmospheric surface-layer turbulence
  • J. Mann
  • Environmental Science, Physics
    Journal of Fluid Mechanics
  • 25 August 1994
Modelling of the complete second-order structure of homogeneous, neutrally stratified atmospheric boundary-layer turbulence, including spectra of all velocity components and cross-spectra of any
Wind field simulation
  • J. Mann
  • Environmental Science
  • 1 October 1998
An experimental investigation of the relative diffusion of particle pairs in three-dimensional turbulent flow
The particle tracking (PT) technique is used to study turbulent diffusion of particle pairs in a three-dimensional turbulent flow generated by two oscillating grids. The experimental data show a
The Bolund Experiment, Part II: Blind Comparison of Microscale Flow Models
Bolund measurements were used for a blind comparison of microscale flow models. Fifty-seven models ranging from numerical to physical were used, including large-eddy simulation (LES) models,
Errors in airborne flux measurements
We present a general approach for estimating systematic and random errors in eddy correlation fluxes and flux gradients measured by aircraft in the convective boundary layer as a function of the
The Bolund Experiment, Part I: Flow Over a Steep, Three-Dimensional Hill
We present an analysis of data from a measurement campaign performed at the Bolund peninsula in Denmark in the winter of 2007–2008. Bolund is a small isolated hill exhibiting a significantly steep
Backwards and forwards relative dispersion in turbulent flow: an experimental investigation.
From particle tracking velocimetry, an experimental measure of the ratio between backwards and forwards relative dispersion in an intermediate Reynolds number turbulent flow is presented and discussed in the context of the characteristics of the rate of strain tensor s(ij).
Influence of atmospheric stability on wind turbine loads
Simulations of wind turbine loads for the NREL 5 MW reference wind turbine under diabatic conditions are performed. The diabatic conditions are incorporated in the input wind field in the form of