Banca de DEFESA: Rodolfo Alves Carvalho

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : Rodolfo Alves Carvalho
DATE: 31/08/2022
TIME: 14:00
LOCAL: Plataforma Teams UnB
TITLE:

Flow Past a Square Prism:  A Numerical Study of Turbulence Models

KEY WORDS:

CFD, Turbulence Models, Numerical Methods, Square Prism.

PAGES: 155
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Estruturas
SPECIALTY: Mecânica das Estruturas
SUMMARY:

 

The advancement of technical-scientific knowledge in the field of engineering makes it possible to design increasingly slender structures with less specific weight. Metallic structures with tensioned membranes, for example, in addition to presenting bold non-Platonic shapes, have low self-weight, therefore, they are extremely sensitive to the action of the wind. Slender structures with high heights are subject to high wind loads that can induce unbearable limit states and even collapse of these structures. The actions caused by flow in a structure depend, among other factors, on its shape. Considering the practical relevance of square-shaped structures, this study aims to reduce the gap in studies for square cylinders through two-dimensional numerical modeling of turbulent external flow through computational fluid dynamics (CFD) in ANSYS Fluent® software. The same flow presented by Bosch and Rodi (1998) was simulated, with 𝑅𝑒=22×103. The relevant parameters for model validation were compared to the data presented by Lyn and Rodi (1994). For this flow, the performance of the RANS turbulence models 𝑅𝑆𝑀,𝑆𝐴 𝑒 𝑆𝑆𝑇 𝑘−𝜔 was evaluated. The 𝑆𝐴 model, with lower computational cost, presented the worst overall performance, overestimating the fluctuating quantities analyzed. The model 𝑆𝑆𝑇 𝑘−𝜔 performed well in the wall region, where the main quantities of interest to engineering are evaluated. In turn, the 𝑅𝑆𝑀 model, with higher computational cost, had an overall performance very close to that of the 𝑆𝑆𝑇 𝑘−𝜔 model in the region of the walls, but with greater accuracy in the measurements performed in the flow. An important gap was found to be filled through the development of a turbulence model that presents adequate performance, both in the flow and in the wall region, has a reasonable computational cost and is capable of overcoming the limitations of existing turbulent viscosity models.

BANKING MEMBERS:
Presidente - 404485 - LINEU JOSE PEDROSO
Interno - 1825564 - RAUL DARIO DURAND FARFAN
Externo à Instituição - FERNANDO AKIRA KUROKAWA - USP