Reynolds number effects on the unsteady aerodynamics and aeroacoustics of static and rotating blades

• Grant number: 24/12707-6
• Support Opportunities: Scholarships abroad - Research Internship - Post-doctor
• Start date: October 01, 2024
• End date: December 31, 2024
• Field of knowledge: Engineering - Aerospace Engineering - Aerodynamics
• Principal Investigator: William Roberto Wolf
• Grantee: Bernardo Luiz Rocha Ribeiro
• Supervisor: Francesco Avallone
• Host Institution: Faculdade de Engenharia Mecânica (FEM). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
• Institution abroad: Politecnico di Torino, Italy
• Associated to the scholarship: 23/08768-7 - High-fidelity simulations of rotor configurations: Analysis of unsteady aerodynamics and aeroacoustics, BP.PD

Abstract

The main objective of this work consists in the investigation of the unsteady aerodynamics and aeroacoustics of static airfoils and rotor configurations. Hence, the present work finds applications in the design, optimization and control of noise generated by helicopters, wind turbines, industrial fans, and cooling systems, besides novel concepts of urban air mobility. High-fidelity numerical simulations will be performed using the lattice Boltzmann method (LBM) since it allows the aerodynamic and aeroacoustic investigation of complex rotor configurations at reduced costs when compared with standard Navier-Stokes CFD solvers. We will investigate flows at different Reynolds numbers where laminar separation bubbles are present. These bubbles are responsible for frequency and amplitude modulations of shear-layer instabilities that scatter at the trailing-edge of the blades, leading to intense noise radiation. Several Reynolds numbers will be investigated for which the boundary layers depict transition and turbulence. In such cases, intermittency plays an important role and post-processing techniques of flow modal decomposition will be employed to provide information on the energetic flow coherent structures responsible for noise generation, including their frequency content and spatial support.