Free surface measurement by stereo-refraction

Free surface measurement by stereo-refraction An optical method for the measurement of the surface topography, height and normal, and the velocity in free surface flows is presented. This method of surface reconstruction is based on the analysis of the apparent displacement between a reference and refracted images of a laser sheet through an interface viewed from two viewpoints. First, the validation of the method is performed in a wave tank by comparison with resistive wave probe measurements. This technique is then applied in a towing tank to measure the flow in the wake of a ship model. The results highlight correspondences between the free surface shape and the 2D velocity field beneath surface in the wake of the ship model. The instantaneous measurement of free surface allows a reconstruction of the global wave field pattern behind the ship. These results, obtained with a non-intrusive technique and with a high spatial resolution, allow an accurate analysis of the flow behind the ship. Tests were conducted for different Froude numbers in a range between 0.24 and 0.52. The results highlight the effect of the Froude number on established waves system. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Experiments in Fluids Springer Journals

Free surface measurement by stereo-refraction

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Publisher
Springer Berlin Heidelberg
Copyright
Copyright © 2013 by Springer-Verlag Berlin Heidelberg
Subject
Engineering; Engineering Fluid Dynamics; Fluid- and Aerodynamics; Engineering Thermodynamics, Heat and Mass Transfer
ISSN
0723-4864
eISSN
1432-1114
D.O.I.
10.1007/s00348-013-1540-4
Publisher site
See Article on Publisher Site

Abstract

An optical method for the measurement of the surface topography, height and normal, and the velocity in free surface flows is presented. This method of surface reconstruction is based on the analysis of the apparent displacement between a reference and refracted images of a laser sheet through an interface viewed from two viewpoints. First, the validation of the method is performed in a wave tank by comparison with resistive wave probe measurements. This technique is then applied in a towing tank to measure the flow in the wake of a ship model. The results highlight correspondences between the free surface shape and the 2D velocity field beneath surface in the wake of the ship model. The instantaneous measurement of free surface allows a reconstruction of the global wave field pattern behind the ship. These results, obtained with a non-intrusive technique and with a high spatial resolution, allow an accurate analysis of the flow behind the ship. Tests were conducted for different Froude numbers in a range between 0.24 and 0.52. The results highlight the effect of the Froude number on established waves system.

Journal

Experiments in FluidsSpringer Journals

Published: May 26, 2013

References

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