Eventos Anais de eventos
COBEM 2023
27th International Congress of Mechanical Engineering
INFLUENCE OF CARREAU-YASUDA MODEL PARAMETERS ON NAJAFI-GOLESTANIAN MICROSWIMMER SWIMMING IN GENERALIZED NEWTONIAN FLUID
Submission Author:
Gustavo Alves Lima , ES , Brazil
Co-Authors:
Gustavo Alves Lima, Roberto Ausas , Jose Alberto Cuminato, Gustavo Buscaglia, Stevens Paz Sánchez
Presenter: Gustavo Alves Lima
doi://10.26678/ABCM.COBEM2023.COB2023-1758
Abstract
Microswimmers can be defined as self-propelled organisms capable of independent locomotion. The study of microswimmers has contributed significantly to advancements in various fields, including biology and biomedicine. Given the diverse range of fluids in which microswimmers may operate during practical applications, there is a growing need for computational analyses of their swimming performance in complex scenarios that closely mimic real-world fluid behavior. This includes non-Newtonian fluids, which can be characterized using the Carreau-Yasuda model. This study aims to investigate the impact of viscous parameters within the Carreau-Yasuda model on the swimming behavior of Najafi-Golestanian microswimmers, applying the optimal swimming policy. Numerical experiments were conducted, demonstrating the method's convergence with mesh refinement and time step reduction. The analysis of the Carreau-Yasuda model's coefficient 'n' and characteristic time 'λ' showed that, for 'n'<1, the average swimming velocity increases (for 'n'≥0.2, it is up to 17.8% greater than the swimming velocity in a Newtonian fluid), while it decreases for 'n'<1.
Keywords
Microswimmers, Non-Newtonian fluid, Najafi-Golestanian swimmer
