Validation of buoyancy driven spectral tensor model using HATS data

The Science of Making Torque from Wind

Chougule, A.^1 ; Mann, J.^2 ; Kelly, M.^2 ; Larsen, G.C.^2

Department of Engineering Sciences, University of Agder, Grimstad

4879, Norway^1

DTU Wind Energy, Technical University of Denmark, Roskilde

4000, Denmark^2

关键词: Atmospheric stability;    Energy-containing eddies;    Horizontal array turbulence study field programs;    Temperature fluctuation;    Temperature spectra;    Temperature variance;    Turbulence anisotropy;    Two point statistics;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/753/3/032038/pdf
DOI  :  10.1088/1742-6596/753/3/032038

来源: IOP

【 摘 要 】

We present a homogeneous spectral tensor model for wind velocity and temperature fluctuations, driven by mean vertical shear and mean temperature gradient. Results from the model, including one-dimensional velocity and temperature spectra and the associated co-spectra, are shown in this paper. The model also reproduces two-point statistics, such as coherence and phases, via cross-spectra between two points separated in space. Model results are compared with observations from the Horizontal Array Turbulence Study (HATS) field program (Horst et al. 2004). The spectral velocity tensor in the model is described via five parameters: the dissipation rate (∈), length scale of energy-containing eddies (L), a turbulence anisotropy parameter (Γ), gradient Richardson number (Ri) representing the atmospheric stability and the rate of destruction of temperature variance (ηθ).