Amirkabir University of Technology Amirkabir Journal of Mechanical Engineering 2008-6032 52 7 2019 04 06 Frequency Analysis and Parametric Estimation of Bubble Formation in Vertical Column Frequency Analysis and Parametric Estimation of Bubble Formation in Vertical Column 1829 1846 3364 10.22060/mej.2019.15110.6027 FA Ehsan Habibi Siyahpoosha Faculty of Mechanical Engineering, Tehran, Tarbiat Modares University Mohammad Reza Ansari Faculty of Mechanical Engineering Journal Article 2018 10 09 Frequency analysis is one of the most important methods to estimate parameters of bubble formation in a vertical liquid column. In the present article, the frequency of bubble formation was analysed. Three-dimensional transient two-phase flow was simulated based on the volume of fluid method. Hybrid Reynolds averaged Navier-Stokes/large eddy simulation turbulence methods were used to improve the ability of computational fluid dynamics to capture formation of bubble in the vertical column. The model used for frequency response prediction was modified by applying the compressibility effect that improved the results for the acoustic behaviour. Due to the importance of interface tracking for sound sources recognition in addition to the problems which occur during combining with the large eddy simulation model in the simulation, different interface reconstruction methods have been applied and high-resolution interface capturing scheme was selected. The results were verified by theoretical and empirical data. Furthermore, it was presented that the natural frequency of bubble reduced as the size of the bubbles increased. The compressibility effect improved the results more accurately and the model behaviour was acted more physically. Frequency analysis is one of the most important methods to estimate parameters of bubble formation in a vertical liquid column. In the present article, the frequency of bubble formation was analysed. Three-dimensional transient two-phase flow was simulated based on the volume of fluid method. Hybrid Reynolds averaged Navier-Stokes/large eddy simulation turbulence methods were used to improve the ability of computational fluid dynamics to capture formation of bubble in the vertical column. The model used for frequency response prediction was modified by applying the compressibility effect that improved the results for the acoustic behaviour. Due to the importance of interface tracking for sound sources recognition in addition to the problems which occur during combining with the large eddy simulation model in the simulation, different interface reconstruction methods have been applied and high-resolution interface capturing scheme was selected. The results were verified by theoretical and empirical data. Furthermore, it was presented that the natural frequency of bubble reduced as the size of the bubbles increased. The compressibility effect improved the results more accurately and the model behaviour was acted more physically. https://mej.aut.ac.ir/article_3364_8a1ee9f2b7abe6e88d1a479ab6a42c5e.pdf