Reconstruction of 3D surface waves generated by moving submerged sphere based on stereo imaging principle
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A sailing ship can give rise to significant disturbances at the water surface, but the perturbation generated by a moving submerged source is much smaller due to the physical property of free surface, as represented by the rigid-lid assumption, whose geometric displacement can sometimes barely be observed or measured. Based on the stereo imaging principle, an experimental system for the three-dimensional measurement of surface perturbation was established by assembling two CCD sensors, through which the surface waves generated by a small submerged sphere were measured, and the small-scale vertical displacements and flow field at the water surface were obtained experimentally. The obtained results were consistent with the theoretical analysis, and the measurement accuracy for the vertical displacements was improved by 50% compared to that of the direct optical method with image grey levels. Additionally, the present measurement technique can be efficiently and precisely applied to other measurements of small-scale disturbances at a free surface.
Key wordsSurface wake stereo imaging geometric reconstruction PIV
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This work was supported by the National Natural Science Foundation of China (Grant No. 11472307).
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