Loading...

Numerical Simulation of Bubble Cluster Dynamics, Using Lattice Boltzmann Method

Daemi, Mahdi | 2015

770 Viewed
  1. Type of Document: Ph.D. Dissertation
  2. Language: Farsi
  3. Document No: 48136 (45)
  4. University: Sharif University of Technology
  5. Department: Aerospace Engineering
  6. Advisor(s): Tayyebi Rahni, Mohammad; Massah, Hamid Reza
  7. Abstract:
  8. Bubble cluster has attracted the interests of many researches since the early twentieth century. Despite its easy generation and numerous occurrences, its study is extremely complex. Describing the dynamical behavior of bubble clusters is possible when quite a few simplifying assumptions are utilized. In other words, one can observe that with current approaches, the relevant theoretical researches are not very valuable. In this research, however, lattice Boltzmann method, a rather recent mesoscopic approach, was used to study the behavior of bubbles in a bubble cluster. Of course, this is only the beginning and there is a long way before getting close to experimental results. However, there are so many efforts all around the world to reach this goal and thus there exists a promising horizon, as far as mesoscopic approaches are concerned. In this study, in order to numerically simulate the dynamical behavior of a bubble cluster in the presence of an ultrasound field, a 121-velocity 3-dimentional lattice Boltzmann method in conjunction with pseudo-potential model was utilized. Due to heavy computing processes, in order to achieve a cost effective computer code, we were forced to use parallel computing, based on GPU. At first, homogeneous and heterogeneous cavitation and the growth and collapse of a single bubble were simulated. In our simulation of dynamical behavior of bubble cluster in an ultrasound field, specific features were studied, namely; collapse, coalescence, acoustic screening and interaction of bubbles. The results show high capacity of LBM in resolving the above mentioned features
  9. Keywords:
  10. Cavitation ; Shan and Chen Model ; Bubble Cluster ; 121 Velocity Lattice Boltzmann Method ; Graphics Procssing Unit (GPU) ; Two Phase Pseudopotential Model

 Digital Object List

 Bookmark

No TOC