Turbulent boundary layer perturbed by a hill

• Grant number: 15/15001-8
• Support type: Scholarships in Brazil - Master
• Effective date (Start): August 01, 2015
• Effective date (End): January 31, 2017
• Field of knowledge: Engineering - Mechanical Engineering - Transport Phenomena
• Principal researcher: Erick de Moraes Franklin
• Grantee: Gabriel Victor Gomes de Oliveira
• Home Institution: Faculdade de Engenharia Mecânica (FEM). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
• Associated research grant: 12/19562-6 - The transport of grains as bed-load and the instabilities of a granular bed, AP.JP

Abstract

Turbulent boundary layers over flat walls in the presence of a hill are frequently found in nature and industry. Some examples are the air and water flows over hills and dunes in deserts and in rivers, respectively, but also water flows over aquatic ripples inside closed conduits. The perturbation of a two-dimensional boundary layer by a hill introduces new scales in the problem, changing the way in which velocities and stresses are distributed along the flow. When in the presence of sediment transport, the stress distribution along the hill is strongly related to bed instabilities. This MSc thesis will consist of an experimental study on the perturbation of a fully-developed turbulent boundary layer by a two-dimensional hill. For the experiments, water flows will be imposed over a hill fixed on the bottom wall of a closed conduit and the flow field will be measured by PIV - Particle Image Velocimetry. From the flow measurements, mean and fluctuation fields will be computed. The velocities and stresses fields will be compared with analytical expressions and the surface shear stress will be analyzed in terms of instabilities of a granular bed. This project is related to the FAPESP Projeto Jovem Pesquisador No. 2012/19562-6.

Scientific publications

(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)

CUNEZ, FERNANDO DAVID; GOMES DE OLIVEIRA, GABRIEL VICTOR; FRANKLIN, ERICK DE MORAES. Turbulent channel flow perturbed by triangular ripples. Journal of the Brazilian Society of Mechanical Sciences and Engineering, v. 40, n. 3 MAR 2018. Web of Science Citations: 2.