In this paper, a method for the digital simulation of wind velocity fields by Fractional Spectral Moment function is proposed. It is shown that by constructing a digital filter whose coefficients are the fractional spectral moments, it is possible to simulate samples of the target process as superposition of Riesz fractional derivatives of a Gaussian white noise processes. The key of this simul...

It is increasingly understood that the assumption of stationarity unrealistic for many spatial processes. In this article, we combine dimension expansion with a spectral method to model big non-stationary fields in computationally efficient manner. Specifically, use Mejía and Rodríguez-Iturbe’s (1974) simulation approach simulate process covariogram at locations have an expanded dimension. We i...

The mean flow and turbulence statistics of the through a simplified urban environment, which is an active research area in order to improve knowledge turbulent cities, investigated. This useful for civil engineering, pedestrian comfort health concerns caused by pollutant spreading. In this work, we provide analysis obtained from well-resolved large-eddy simulations (LES). A detailed database re...