Numerical study on role of foot of a flue organ pipe: relative phases in oscillations among pipe, foot and jetShiryu Ikoga, Tatsuki Onomata, Ryoya Tabata, Sho Iwagami, Taizo Kobayashi and Kin’ya TakahashiActa Acust., 8 (2024) 50DOI: https://doi.org/10.1051/aacus/2024060