Banca de DEFESA: EMANUEL JOAQUIM DANIEL JÚNIOR

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : EMANUEL JOAQUIM DANIEL JÚNIOR
DATE: 22/02/2024
TIME: 09:00
LOCAL: Pós-Graduação Engenharia Civil
TITLE:

Impacts of Roughness Variation on Velocity Profiles in Low-Gradient Fluvial Channels Using CFD

KEY WORDS:

Isotactic curves; urban drainage; lining of river channels.

PAGES: 137
BIG AREA: Engenharias
AREA: Engenharia Naval e Oceânica
SUMMARY:

Until the end of the 20th century, the concept of urban drainage was limited to the simple management of precipitation, seeking only to reduce locally the impacts generated by floods. In the 21st century, this management started to encompass several areas, adopting a position that evolved from being merely corrective but began to encompass the premises of sustainability and coexistence in tune with nature, understanding that the Projects must reconcile with water ecosystems. In this sense, channel designs can still evolve and better incorporate such concepts, especially in terms of understanding the impact of the roughness coefficient in a three-dimensional view of the flow. At the same time, it was found that computational numerical calculation techniques that involve the use of CFD are very common in the literature for analyzing phenomena of hydraulic structures and free surfaces. Within this perspective, this work aims to deepen knowledge regarding the formation of velocity profiles, for different roughness, in an open channel with a small slope, using as a basis the prototype channel existing in the Hydraulics, Computational Hydraulics and Hydrology Laboratory at UFPE. An experimental test was carried out to obtain the boundary conditions of the modeled computational domain, as well as a CFD simulation project under the most current best practices in the literature. To do the verification, mesh and time step tests were carried out, in addition to observing excellent behavior of the scalars as expected from the assigned equational models. The results found were satisfactory, observing qualitatively, that the isotactic profiles behaved as expected, mainly when correlating the different materials with the graph that represents the relationship between Manning’s coefficient and Nikuradse’s sand equivalent roughness. It was verified that acrylic and concrete coatings have similar behavior, which differ exponentially when changing to a laterite coating, but which once again presents a certain homogeneity compared to gabion or natural soil coatings. Quantitatively, it was observed that the variation in velocity is only significant up to the point 0.0833 m on the Z axis and 0.0544 m on the Y axis, observing, for the Z axis, a variation in the center of the flow of 0.0045 m/s of velocity, and, for the Y axis, of 0.0033 m/s. Therefore, it is concluded that CFD techniques were justified as a good tool to assist in the studies of hydraulic phenomena, obtaining results within a physics coherent with the defined equational models, as well as being harmonious with other studies carried out in the same area.

COMMITTEE MEMBERS:
Externa à Instituição - EDNA MARIA DE FARIA VIANA - UFMG
Presidente - 2130612 - JOSE ROBERTO GONCALVES DE AZEVEDO
Externa à Instituição - ROBERTA DE MELO GUEDES ALCOFORADO - UPE