Transition due to isolated roughness in a swept wing boundary layer

The present work is dedicated to the investigation of effect an isolated roughness element on a swept wing boundary layer. In particular, flow modifications incurred by single cylindrical applied model are measured, toward describing nature perturbations introduced in field, their development near and far wake region, as well eventual breakdown. measurements performed using infrared thermography, achieve general overview origin spatial spreading. Local quantitative characterization stationary unsteady disturbances evolving instead acquired through hot wire anemometry. When undisturbed laminar layer, elements found introduce disturbances, which lead formation turbulent wedge. As it develops downstream, wedge undergoes rapid spanwise expansion, affecting adjacent regions. mostly associated with instabilities shedding process initiated wake, comparably dominant features characterizing transition two-dimensional layers conditioned element. Nonetheless, presence crossflow velocity component layer baseflow notably affects overall development, introducing asymmetric evolution main features.