Numerical Simulation of Bubble Growth and Collapse Dynamics and Investigation of the Effect of Bubble Collapse on Shear Stress on a Rigid Wall Using OpenFoam

This study presents a numerical investigation of the dynamics of bubble growth and collapse near a rigid wall using the OpenFOAM software. The main objective of this research is to gain a better understanding of the cavitation phenomenon of bubbles and its effect on wall shear stress. In this regard, a numerical model has been developed that includes energy equations and compressible two-phase flow. The Lafaurie filter is also used for accurate tracking of the bubble interface. This model has been validated against experimental data and has demonstrated the ability to accurately predict bubble behavior. results indicate that the initial pressure difference between the inside of the bubble and the surrounding environment plays a critical role in bubble dynamics.The moment of bubble collapse is associated with maximum temperature, velocity, and pressure, and the energy generated in this process can be released as a shock wave. During the bubble growth phase, the interface velocity is very high, and at the moment of maximum volume, this velocity is almost negligible. In addition, the shear stress on the wall at various distances from the bubble has been examined.By changing the gamma number (the ratio of the distance from the bubble center to the solid surface to the maximum bubble radius), the amount of shear stress changes.The highest shear stress has been observed at a gamma number equal to 2, indicating a stronger jet caused by bubble collapse at this distance. These findings can be useful in applications such as particle removal from surfaces.