Application of local optical flow methods to high-velocity free-surface flows: Validation and application to stepped chutes

摘要

Graphical abstractExperimental setup of ultra-high-speed video camera setup alongside the stepped spillway model and comparative experimental results in terms of interfacial velocity.Display OmittedHighlights?Tests of two local optical flow techniques (Lucas-Kanade and Farneback).?Application to high-velocity air-water skimming flows above a stepped chute.?Simultaneous comparison with phase-detection probe measurements.?Close agreement in terms of flow patterns and void fraction.?Underestimation of bubble count rate and longitudinal velocity.Abstra