Technical gazette, Vol. 28 No. 4, 2021.
Original scientific paper
https://doi.org/10.17559/TV-20210401114628
Computation of Wind Wave Flow Field with Moving Boundary Based on Image Processing
Yajun Fang*
; School of Economics and Management, Beijing Jiaotong University, Beijing, Beijing Tongzhou District Water Bureau, China
Chuanqi Yu
; Beijing Tongzhou District Water Bureau, Beijing, China
Xihua Wang
; Tsinghua Sichuan Energy Internet Research Institute, Chengdu, Sichuan, China
Jun Zheng
; Tsinghua Sichuan Energy Internet Research Institute, Chengdu, Sichuan, China
Abstract
Based on image processing technology, a solution to the interference of moving boundary in wind wave flow field calculation is proposed. Invariant background is extracted from image sequence by means of the minimum method, and the differences between image sequence and invariant background image are used to remove the invariant background of image sequence. The image segmentation threshold is determined based on maximum interclass variance method, and the scatter interference is removed by image filtering and morphological technology, to obtain the target image. Then the flow field is calculated by PIV technology and the results of the flow field before and after the boundary treatment are compared. The experimental results show that the accuracy and speed of flow field calculation are greatly improved after removal of moving boundary disturbance, and the results of wind wave flow field calculation accord with the motion mechanism of hydraulic wind wave.
Keywords
flow field; image filtering; invariant background; moving boundary; morphology
Hrčak ID:
260732
URI
Publication date:
22.7.2021.
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