Morphological Analysis for Thermodynamic of Cavitation Collapse Near Fractal Solid Wall

Abstract

Abstract In this paper, a fractal geometric boundary with natural wall features is introduced into a hybrid LBM multiphase model. The physical model of cavitation bubble collapse near the irregular geometric wall is established to study the thermodynamic characteristics of the bubble collapse. Due to the lack of periodicity, symmetry, spatial uniformity and obvious correlation in the LBM simulation of the bubble collapse near the fractal wall, the morphological analysis based on Minkowski functional is introduced into the thermodynamic investigation of cavitation bubble for the first time in order to analyze and obtain the effective information. The results show that the Minkowski functional method can study the temperature information in complex physical fields hierarchically and quantitatively. The high/low temperature region of the cavitation flow is explored and thermal effect between irregular and fractal geometric wall and cavitation bubble can be revealed. It illustrates that LBM and morphological analysis complement each other, and morphological analysis can also be used as an optional and potential tool in the research field of complex multiphase flow.