Amirkabir University of Technology Amirkabir Journal of Mechanical Engineering 2008-6032 56 2 2024 04 20 Numerical study of bubble growth and collapse dynamics, near the rigid wall Numerical study of bubble growth and collapse dynamics, near the rigid wall 213 240 5462 10.22060/mej.2024.23052.7715 FA Mohammadreza Najafigamasaei Faculty of Mechanical Engineering, Tarbiat Modares University Sajad Khodadadi Faculty of Mechanical Engineering, Tarbiat Modares University Reza Maddahian Faculty of Mechanical Engineering, Tarbiat Modares University, Tehran, Iran Journal Article 2024 03 18 In this study, the dynamics of bubble growth and collapse near a rigid wall is investigated using the modified volume of fluid method and the improved compressible interfoam solver in the OpenFoam open-source code. The research results indicate that the dimensionless gamma number has the most significant impact on the growth and collapse of the bubble near the wall. This study examined two gamma numbers 0.8 and 1.3. It was found that with a 60% increase in the gamma number, the maximum shear stress on the wall decreased by 37%, while the maximum absolute temperature inside the bubble increased by 12%. Additionally, as the gamma number increases, the area affected by the jet impact due to the bubble collapse increases. Within the scope of the present research, the initial pressure parameter of the bubble has the most significant impact on the maximum temperature inside the bubble. In the range of considered initial pressures, a 50% increase in the initial pressure results in a 6% decrease in the maximum temperature of the bubble. However, the values of other studied parameters, such as shear stress, change by less than one percent. In this study, the dynamics of bubble growth and collapse near a rigid wall is investigated using the modified volume of fluid method and the improved compressible interfoam solver in the OpenFoam open-source code. The research results indicate that the dimensionless gamma number has the most significant impact on the growth and collapse of the bubble near the wall. This study examined two gamma numbers 0.8 and 1.3. It was found that with a 60% increase in the gamma number, the maximum shear stress on the wall decreased by 37%, while the maximum absolute temperature inside the bubble increased by 12%. Additionally, as the gamma number increases, the area affected by the jet impact due to the bubble collapse increases. Within the scope of the present research, the initial pressure parameter of the bubble has the most significant impact on the maximum temperature inside the bubble. In the range of considered initial pressures, a 50% increase in the initial pressure results in a 6% decrease in the maximum temperature of the bubble. However, the values of other studied parameters, such as shear stress, change by less than one percent.

https://mej.aut.ac.ir/article_5462_dc187a42c307fcb28b29ea7d4db83a17.pdf