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Nonlinear eddy-viscosity model coupled to laminar-turbulent transition model

Grant number: 23/09177-2
Support Opportunities:Scholarships in Brazil - Doctorate
Effective date (Start): August 01, 2023
Effective date (End): November 30, 2026
Field of knowledge:Engineering - Aerospace Engineering - Aerodynamics
Principal Investigator:João Luiz Filgueiras de Azevedo
Grantee:Thamires das Chagas Silva
Host Institution: Pró-Reitoria de Pós-Graduação e Pesquisa. Instituto Tecnológico de Aeronáutica (ITA). Ministério da Defesa (Brasil). São José dos Campos , SP, Brazil
Host Company:Ministério da Defesa (Brasil). Instituto Tecnológico de Aeronáutica (ITA). Divisão de Engenharia Mecânica (IEM)
Associated research grant:21/11258-5 - Engineering Research Center for the Aerial Mobility of the Future (ERC-AMF), AP.PCPE

Abstract

The doctoral research work here proposed aims at developing a more advanced laminar-turbulent transition model to perform simulations of turbulent flows that include the phenomenon of laminar-turbulent transition. The laminar-turbulent transition process is important for the design of aerodynamic configurations for aeronautical applications, such as wings, high-lift devices, nacelles, and horizontal and vertical stabilizers, for example. The optimization of these components depends on an accurate investigation of the laminar-turbulent transition process of the flow over these configurations. With appropriate studies, it is possible to achieve laminar flow along significant portions of the surfaces of these components, providing improved aerodynamic performance. For the research proposal presented here, the main goal is to obtain a more advanced laminar-turbulent transition model. Initially, the work will investigate the effect of the anisotropy of the Reynolds stress tensor on fully turbulent flows. For this, a study of nonlinear turbulence models will be carried out, since such models should be able to deal with anisotropic effects present in the flow. Afterwards, one of these nonlinear turbulence models will be coupled to the ³-Re¸ transition model. Originally, the ³-Re¸ transition model was coupled to a linear turbulence model, the SST model. The research is expected to achieve a laminar-turbulent transition model which can deal with more complex physical phenomena by coupling of the ³-Re¸ transition model to a nonlinear turbulence model. The validation of the resulting model will include simulations of flows over realistic configurations of interest to the aeronautical industry. Afterwards, correlations which consider crossflow instabilities on the transition process will also be included in the new transition model obtained by the present research. The contributions of this research proposal will be implemented in the in-house code in continuous development and improvement by the research group of the Computational Aerodynamics Laboratory of DCTA/IAE. The results obtained will be compared with experimental and numerical data available in the literature. (AU)

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