Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
Laminar Separation Bubbles Analysis of Giesekus Fluid Flow
Submission Author:
Beatriz Liara Carreira , SP
Co-Authors:
Beatriz Liara Carreira, Daniel Rodriguez, Elmer Gennaro, Analice Costacurta Brandi, Leandro Franco de Souza
Presenter: Beatriz Liara Carreira
doi://10.26678/ABCM.COBEM2023.COB2023-1636
Abstract
Laminar separation bubbles arise due to the combined effect of airfoil curvature and angle of attack when an adverse pressure gradient appears after peak suction. If this pressure gradient is strong enough, the laminar boundary layer is separated. This creates the recirculation zone, where the fluid moves more slowly and in the opposite direction. This region is unstable, so the laminar flow will eventually transition to a turbulent regime. Therefore, a complete understanding of the transition phenomenon is essential. The hydrodynamic stability analysis is carried out to predict these changes. There are studies in this direction considering Newtonian fluids, but this is still an open question in the case of non-Newtonian fluids. Thus, this work aims to investigate the base flow that simulates a two-dimensional laminar separation bubble in an incompressible flow considering a non-Newtonian fluid using the Giesekus model, analyzing how some characteristics behave when non-Newtonian parameters are varied. In the future, the global linear stability theory will be used to investigate these separation bubbles non-Newtonian, using a bi-global technique.
Keywords
Separation bubble, Giesekus fluid, Bi-global Stability Analysis, Laminar-turbulent transition
