Motivated by the need to characterize power fluctuations in wind farms, we study spatio-temporal correlations of a neutral atmospheric boundary layer in terms of the joint wavenumber-frequency spectrum of the streamwise velocity fluctuations. To this end, we perform a theoretical analysis of a simple advection model featuring the advection of small- scale velocity fluctuations by the mean flow and large-scale velocity fluctuations. The model is compared to data from large-eddy simulations (LES). We find that the model captures the trends observed in LES, specifically a Doppler shift of frequencies due to the mean flow as well as a Doppler broadening due to random sweeping effects.
|Journal||Journal of physics: Conference series|
|Publication status||Published - 2014|
|Event||The Science of Making Torque from Wind, TORQUE 2014 - Copenhagen, Denmark|
Duration: 18 Jun 2014 → 20 Jun 2014