Stability analysis of viscoelastic Oldroyd-B and Giesekus fluids in a Poiseuille flow - Brandi, Analice C.; Furlan, Laison J. S.; Silva, Arianne Alves da; Araujo, Matheus Tozo de; Souza, Leandro Franco de (Workshop, Progress in Flow Instability, Transition and Control - ERCOFTAC SIG 33, 2018)