Switch of tonal noise generation mechanisms in airfoil transitional flows

Autor(es)

Ricciardi, Tulio R. ; Wolf, William R.

• Tipo de documento: Artigo Científico
• Fonte: PHYSICAL REVIEW FLUIDS; v. 7, n. 8, p. 21-pg., 2022-08-03.

Resumo

Large eddy simulations are performed to study tonal noise generation by a NACA0012 airfoil at an angle of attack alpha = 3 deg. and freestream Mach number of M-infinity = 0.3. Different Reynolds numbers are analyzed spanning 0.5 x 10(5) <= Re <= 4 x 10(5). Results show that the flow patterns responsible for noise generation appear from different laminar separation bubbles, including one observed over the airfoil suction side and another near the trailing edge, on the pressure side. For lower Reynolds numbers, intermittent vortex dynamics on the suction side results in either coherent structures or turbulent packets advected towards the trailing edge. Such flow dynamics also affects the separation bubbles on the pressure side, which become intermittent. Despite the irregular occurrence of laminar-turbulent transition, the noise spectrum depicts a main tone with multiple equidistant secondary tones. Increasing the Reynolds number leads to a permanent turbulent regime on the suction side that reduces the coherence level causing only small scale turbulent eddies to be observed. Furthermore, the laminar separation bubble on the suction side almost vanishes while that on the pressure side becomes more pronounced and permanent. As a consequence, the dominant noise generation mechanism becomes the vortex shedding along the wake. (AU)

• Processo FAPESP: 18/11835-0 - Investigação numérica do ruído gerado por trens de pouso
• Beneficiário: Tulio Rodarte Ricciardi
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 13/08293-7 - CECC - Centro de Engenharia e Ciências Computacionais
• Beneficiário: Munir Salomao Skaf
• Modalidade de apoio: Auxílio à Pesquisa - Centros de Pesquisa, Inovação e Difusão - CEPIDs
• 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