Vertical cross-spectral phases in atmospheric flow

The Science of Making Torque from Wind 2012

Chougule, A.^1 ; Mann, J.^1 ; Kelly, M.^1

DTU Wind Energy, Risø Campus, Roskilde

4000, Denmark^1

关键词: Atmospheric flows;    Atmospheric stability;    Neutral conditions;    Rapid distortion theory;    Velocity components;    Vertical component;    Vertical separation;    Vertical velocity;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/555/1/012017/pdf
DOI  :  10.1088/1742-6596/555/1/012017

来源: IOP

【 摘 要 】

The cross-spectral phases between velocity components at two heights are analyzed from observations at the Høvsøre test site under diabatic conditions. These phases represent the degree to which turbulence sensed at one height leads (or lags) in time the turbulence sensed at the other height. The phase angle of the cross-wind component is observed to be significantly greater than the phase for the along-wind component, which in turn is greater than the phase for the vertical component. The cross-wind and along-wind phases increase with stream-wise wavenumber and vertical separation distance, but there is no significant change in the phase angle of vertical velocity. The phase angles for all atmospheric stabilities show similar order in phasing. The phase angles from the H0vs0re observations under neutral condition are compared with a rapid distortion theory model which show similar order in phase shift.