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A New Application of the Digital Synthetic Schlieren in Lab Experiments of the Internal Waves
Earth Sciences
Volume 7, Issue 6, December 2018, Pages: 283-288
Received: Dec. 9, 2018; Published: Dec. 11, 2018
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Qingjun Meng, College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao, China
Yanzhen Gu, College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao, China
Peiliang Li, Ocean College, ZheJiang University, Zhoushan, China
Xinzhu Wu, School of Hydraulic Engineering, Dalian University of Technology, Dalian, China
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Laboratory experiment is an important method in the study of ocean internal waves, and the schlieren technique is an effective way to observe the internal waves in the laboratory. The digital synthetic schlieren technique is mostly applied to two-dimensional density-stratified flows. The technique is improved by setting up the Charge Coupled Device (CCD) vertically to shoot the reference images in this research. Then the three-dimensional density-stratified flows can be detected in this way. The authors attempt a set of lab experiments to verify the rationality of this technique. There is a horizontally moving spherule with constant velocity at the interface of the two-layer stratified water in the experiment. The moving spherule generates internal waves between the two-layer fluids. The authors successfully capture the three-dimensional structure of the internal waves generated by the horizontally moving spherule. It is obvious that the internal waves have characteristics of the Kelvin Internal Wake and the quantitative parameters agree well with the previous studies. The experimental results reveal that the improved digital schlieren technique is rational and feasible in the lab internal waves observations. The detailed three-dimensional structure of the internal waves, the internal wave energy distribution and propagation in the whole field and the nonlinear interactions between the internal waves can be further studied through this method in the future.
Internal Waves, Synthetic Schlieren, Kelvin Internal Wake
To cite this article
Qingjun Meng, Yanzhen Gu, Peiliang Li, Xinzhu Wu, A New Application of the Digital Synthetic Schlieren in Lab Experiments of the Internal Waves, Earth Sciences. Vol. 7, No. 6, 2018, pp. 283-288. doi: 10.11648/
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