Statistical analysis of wind-induced pressure fields: A methodological perspective

Identification of meaningful coherent structures in the wind-induced pressure on a prismatic body

“…All the sensorsq j ðtÞ ðj ¼ 1,. . .,7Þ on the LLF have similar super-Gaussian pdf with thicker tail on the suction side, likewise it has been observed on both the lateral faces for the case a¼01 (Carassale and Marr e-Brunenghi, 2011). On the WLF the pdf ofq j ðtÞ ðj ¼ 15,. .…”

“…Different ICA modes on the WLF are almost statistically independent for zero time lag, but are well correlated for time lags compatible with the propagation velocity of pressure fluctuations advected by the mean flow. This suggests that ICA modes on the WLF represent subsequent snapshots of a dynamical phenomenon, like in the cases discussed in Carassale and Marr e-Brunenghi (2011) and Carassale (2012). 5.…”

“…(4)), with the difference that the columns a k of the matrix A are, in general, non-orthogonal and that the ICs s k are now statistically independent (instead of simply uncorrelated like the PCs x k ). Due to this analogy, ICA can be used as tool to estimate CSs from experimental datasets (Carassale and Marr e-Brunenghi, 2011;Carassale, 2012). When ICA is applied for this purpose, the situation becomes more complicated since the ICs are usually not explicitly present in the observed physical system and the concept of virtual source (Zhou and Chelidze, 2007) must be invoked.…”

“…To overcome this constraint, the use of non-orthogonal modal expansions based on the Independent Component Analysis (ICA, e.g. Hyvärinen et al, 2001) have been adopted (Gilliam et al, 2004;He et al, 2007;Carassale and Marr e-Brunenghi, 2011;Carassale, 2012) demonstrating that, at least in the applications discussed in these references, the requirements from 1 to 3 of the above list are well fulfilled. The forth requirement has never been addressed and is here discussed in Section 3.…”

Mode Interpretation of Aerodynamic Characteristics of Tall Buildings Subject to Twisted Winds

“…mechanics and wind engineering to capture coherent structures and pressure patterns contained in the flow field and the associated pressure field [16][17][18][19]. However, almost all previous studies have only addressed the topic regarding modal identification of the aerodynamic characteristics of tall buildings exposed to conventional wind profiles, Barely no study to date examines that under TWP [20,21].…”