Richard J.A.M. Stevens

Physics of Fluids · University of Twente

Publication 27 · Atmospheric turbulence

A wavenumber-frequency spectral model for atmospheric boundary layers

M. Wilczek, R.J.A.M. Stevens, Y. Narita, C. Meneveau, J. Phys.: Conf. Ser. 524, 012104 (2014).

Main finding

This paper establishes an economical leading-order ABL spectral representation and documents its failure modes. It does not establish a complete dynamical model, quantitative prediction error, or wind-farm transfer.

Wavenumber-frequency spectra from simulation and from the model side by side
How to read the figure. The wavenumber-frequency spectrum of streamwise velocity in a neutral boundary layer, from large-eddy simulation and from the model, side by side. The model reproduces the ridge that marks structures being advected past a point, but renders it narrower and straighter than the simulation does. That broadening is large eddies varying the speed at which smaller structures are carried past. The figure shows a leading-order representation and its failure mode at once; it is not a complete dynamical model or a quantified prediction error. Open the full-resolution figure. Figure 2. M. Wilczek et al. (2014). No separate licence is stated here; consult the original publication and credited source before reuse.

Why this matters

Large eddies vary the speed at which smaller structures pass a point.

Research context

This work builds on The analytical result is adapted from Wilczek and Narita (2012; Ref. 3), while the wall and spectral laws are imported from external foundational literature.

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