Dynamic mode decomposition for analyzing two-phase flows video data

Abstract

Dynamic mode decomposition (DMD) has been used for numerical and video data analysis in fluid flows. Despite of its advantages, we have noticed some issues in the DMD methodology: (a) Although the number N of snapshots used to compute the dynamic modes is a fundamental parameter, there is not a systematic procedure to set it; (b) The number N may vary along the simulation; (c) In the case of two-phase flows the investigation of the phase interface preservation in the dynamic modes has not been considered in previous works. In this paper, we address these issues using two-phase flow videos (slug and stratified) recorded as a case study.