The mixing length, l, derived from the wind speed profile, is found to be linearly proportional to the length-scale of turbulence, derived either from the peak of the vertical velocity spectrum, (λm)w, or from a three-dimensional turbulence spectral model, for a range of atmospheric ...
Turbulent length scaleIn the present study, the spatial correlation coefficients of wind speeds at different heights in the atmospheric boundary layer under near-neutral conditions are calculated based on field measurements taken by Doppler SODARs. To guarantee near-neutral stability, only measurements ...
N denotes the total length of the wind speed sequence. The raw wind speed data and its CEEMD decomposition results are shown in Fig. 3, and a total of 6 IMF components and 1 residual component are decomposed. From Fig. 3, it is obvious that the temporal characteristic scale of the IMF...
The airflow field around wind fences with different porosities, which are important in determining the efficiency of fences as a windbreak, is typically studied via scaled wind tunnel experiments and numerical simulations. However, the scale problem in w
A comprehensive full-scale measurement campaign to study wind loading on circular cylinders is described.The effect of wind turbulence on the transition from the sub-critical to the critical Reynolds number range is highlighted.The effect of wind turbulence on the vortex shedding off circular cylinders...
Impact of large scale wind power on power system stability This paper presents a detailed analysis of the impact of large scale wind power generation on both the dynamic voltage stability and the transient stabilit... M El-Shimy,MAL Badr,OM Rassem - IEEE 被引量: 154发表: 2008年 Investigatio...
A rectangular-shaped building with its length equal to twice its height and width was oriented with the long side perpendicular to the approaching wind. The stack was placed midway along the lee side of the building. In all phases of the study, each smoke or tracer release from the stack ...
In recent decades, full-scale monitoring has proven to be a powerful tool for closing the gap between design predictions and actual as-built performance, particularly in seismic zones and for a growing portfolio of bridges. Why then has the wind engineering community not achieved similar large-sca...
To explicitly simulate the motion on the dissipative length scale, scientists used the Navier–Stokes equations to model the energy cascade18,19. Additionally, a top-hat filter of Smagorinsky was introduced to separate the flow field from the small-eddy field20. The LES method was proved ...
2, ARs are synoptic-scale filaments representing the 4 or 5 largest water vapour fluxes that occur between the midlatitudes and the tropics on any given day, and the length of an AR is generally five times its width. ARs often linked to extratropical cyclones and fronts4,5, the key ...