EPTT 2022

13th Spring School on Transition and Turbulence

Stability Analysis of Viscoelastic Fluid Flows in Boundary Layer

Submission Author: Beatriz Liara Carreira , SP
Co-Authors: Beatriz Liara Carreira, Leandro Franco de Souza, Analice Brandi
Presenter: Beatriz Liara Carreira

doi://10.26678/ABCM.EPTT2022.EPT22-0009

 

Abstract

A laminar flow is always subject to small disturbances that can occur due to several factors, such as structural vibration, surface roughness, noise, external turbulence, etc. If these disturbances are not dampened, the laminar flow evolves into a more complex state but not necessarily a turbulent state. This process, known as the laminar-turbulent transition, is extremely complex and not completely understood, especially for non-Newtonian fluid flows. A complete understanding of the transition process, with consequent ability to control, would open up great perspectives in science and industry. Hydrodynamic stability analysis is carried out with this objective. In the boundary layer, the transition can occur due to the convection of Tolmien-Schlichting waves. Thus, the objective of this work is to investigate the hydrodynamic stability in a two-dimensional, incompressible and isothermal flow of a Giesekus viscoelastic fluid over a flat plate through the analysis of Tollmien-Schlichting wave convection using the Linear Stability Theory.

Keywords

Giesekus fluid, Linear stability theory, Bounday Layer, Laminar-turbulent transition

 

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