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Turbulent flow over bedforms: experiments

Grant number: 20/15624-3
Support type:Scholarships in Brazil - Master
Effective date (Start): September 01, 2021
Effective date (End): August 31, 2023
Field of knowledge:Engineering - Mechanical Engineering - Transport Phenomena
Principal researcher:Erick de Moraes Franklin
Grantee:Jimmy Gabriel Alvarez Zambrano
Home Institution: Faculdade de Engenharia Mecânica (FEM). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
Associated research grant:18/14981-7 - Modeling of dense granular flows: experiments, numerical simulations and stability analyses, AP.JP2

Abstract

Boundary layers over plane walls disturbed by ripples are frequently found in both nature and industry. Some examples are air flows over ripples and dunes in deserts and water flows over subaqueous dunes in pipes. The perturbation of the boundary layer by a wavy bed introduces new scales in the problem, changing the way in which velocities and stresses are distributed in the flow field. When in the presence of sediment transport, the stress distribution is highly associated with bed instabilities. This MSc Thesis is devoted to study experimentally a turbulent flow over a granular bed with bedforms. In the experiments, different water flows will be imposed over wavy granular beds in a closed conduit, and the velocity fields will be measured by using PIV (Particle Image Velocimetry). From the instantaneous fields, mean and fluctuations will be computed. Velocity and stress fields will be compared with analytical expressions existing in the literature and the shear stress on the bed will be analyzed in terms of bed instability. (AU)

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