Study of the wall pressure variations on the stall inception of a thick cambered profile at high Reynolds number
Caroline Braud, Bérengère Podvin, Julien Deparday
Abstract
Understanding the flow physics near stall at high chord-based Reynolds numbers (> ${10}^{6}$) remains a challenge for both experimental and numerical approaches. Generally statistical bi-dimensionality of the flow is assumed $a$ $p\phantom{\rule{0}{0ex}}r\phantom{\rule{0}{0ex}}i\phantom{\rule{0}{0ex}}o\phantom{\rule{0}{0ex}}r\phantom{\rule{0}{0ex}}i$. In the present study, the wall pressure at two chords provides a description of the flow evolution with the angle of incidence. Our results indicate that flow separation at high Reynolds numbers is an inherently local, three-dimensional and unsteady process that occurs in a continuous manner. However, as it can be represented with mainly two proper orthogonal decomposition modes, our results also suggest that a low-order approach may offer a viable modeling route.