Assessment of Transitional Airfoil Flows through the Lattice-Boltzmann Method Part II: Finite Wing Effects

Autor(es)

Ribeiro, Bernardo Luiz R. ; Dantas, Cayan A. ; Wolf, William R.

• Tipo de documento: Artigo Científico
• Fonte: AIAA AVIATION FORUM AND ASCEND 2024; v. N/A, p. 11-pg., 2024-01-01.

Resumo

This study is the second in a two-part series, evaluating the ability of a lattice-Boltzmann high-fidelity simulation tool to resolve transitional flows with intermittent events. Here, the lattice-Boltzmann method (LBM) is employed to investigate the flow over a NACA0012 airfoil at an angle of attack of alpha = 3 degrees, freestream Mach number M-infinity = 0.3, and Reynolds number Re = 5 x 10(4). This flow configuration is typically found in the development of quiet air vehicles, making the study of noise generation mechanisms particularly relevant. For this case, a laminar separation bubble forms on the airfoil's suction side, leading to complex dynamics that include the shedding of coherent structures and the generation of trailing-edge tonal noise. For this second part, finite wing effects on the coherent structures are investigated and compared to the flow fields of a wing with periodic boundary conditions, as presented in the first part. The results indicate that the laminar separation bubble (LSB) on the suction side is significantly influenced by wing tip effects, forming much closer to the trailing edge than in the infinite wing. Additionally, an analysis of the vortex dynamics reveals distinct patterns of vortex shedding from the LSB, differing markedly from those observed in the spanwise homogeneous case. Overall, the finite wing impacts the pressure gradient along the wing, delaying the bubble formation and its subsequent vortex shedding and, hence, changing the acoustic noise generation. (AU)

• Processo FAPESP: 21/06448-0 - Simulações numéricas de alta fidelidade aplicadas em aerodinâmica não-estacionária, turbulência e aeroacústica
• Beneficiário: William Roberto Wolf
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores - Fase 2
• Processo FAPESP: 23/08768-7 - Simulações de alta fidelidade de configurações de rotores: Análise da aerodinâmica não-estacionária e aeroacústica
• Beneficiário: Bernardo Luiz Rocha Ribeiro
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado