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- W2577418359 abstract "Stepped spillway flows are characterised by strong turbulence and air entrainment. The overflows are typically investigated in laboratory, albeit large-size physical models must be used to minimise potential scale effects. The present study examines the feasibility of two local optical flow techniques – the Lucas-Kanade method and the Farneback method – applied to high-velocity airwater skimming flows above several types of stepped roughness. Despite their long prevalence in the computer vision industry, these methods are not yet widely known to the air-water flow community. Experimental studies were undertaken in a large-size physical model with three different types of stepped roughness. The physical meaning of the optical signal was elucidated and the optical flow results were validated with a synchronised setup consisting of an ultra-high speed video camera and a phase-detection probe with a time delay shorter than 1 ms. Sensitivity analysis results found that the optical flow accuracy was sensitive to the sampling rate selection and to high velocity gradients. The optical velocity, vorticity, rate-of-strain, turbulence intensity and turbulent kinetic energy maps were deduced. The results highlighted some effect of cavity shape on the mainstream spillway flow and the findings were comparable to those obtained in an earlier PIV study of clear water skimming flow. The present study demonstrated that the local optical flow algorithms are efficient and robust tools for providing qualitative and quantitative information to complement existing studies on aerated skimming flows. Importantly, however, the optical flow method characterises the air-water flow properties next to the sidewall, where the bubble count rate and interfacial velocity were found to be underestimated, compared to the channel centreline interfacial properties." @default.
- W2577418359 created "2017-01-26" @default.
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- W2577418359 date "2017-01-01" @default.
- W2577418359 modified "2023-09-23" @default.
- W2577418359 title "Application of local optical flow methods to high-velocity air-water flows: validation and application to skimming flows on stepped chutes" @default.
- W2577418359 doi "https://doi.org/10.14264/417351" @default.
- W2577418359 hasPublicationYear "2017" @default.
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