PIV measurements of flow around an arbitrarily moving free surface

Park, Jinsoo; Im, Sunghyuk; Sung, Hyung Jin; Park, Jun-Sang

doi:10.1007/s00348-015-1920-z

Cited by 27 publications

(13 citation statements)

References 32 publications

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“…Typically, one or more cylindrical lenses are used to adjust field angle and thickness of the laser light sheet. The light sheet thickness in the measurement area is usually about 1 -3 mm but can be even thinner [73]- [76]. However, using such a thin light sheet as the illumination method also brings about a challenge for measuring a strong three-dimensional flow field.…”

Section: Illumination Systemmentioning

confidence: 99%

A Review of Particle Image Velocimetry for Fish Migration

Sayeed-Bin-Asad¹,

Lundström²,

Andersson³

et al. 2016

WJM

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Understanding the flow characteristic in fishways is crucial for efficient fish migration. Flow characteristic measurements can generally provide quantitative information of velocity distributions in such passages; Particle Image Velocimetry (PIV) has become one of the most versatile techniques to disclose flow fields in general and in fishways, in particular. This paper firstly gives an overview of fish migration along with fish ladders and then the application of PIV measurements on the fish migration process. The overview shows that the quantitative and detailed turbulent flow information in fish ladders obtained by PIV is critical for analyzing turbulent properties and validating numerical results.

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Section: Illumination Systemmentioning

confidence: 99%

A Review of Particle Image Velocimetry for Fish Migration

Sayeed-Bin-Asad¹,

Lundström²,

Andersson³

et al. 2016

WJM

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“…Using a simplified experimental procedure, the proposed modeling of a coupled pendulum-slosh problem by an equivalent mechanical model was validated by experimental results and analytical solutions. In the literature, experimental investigations [3,[27][28][29][30][31][32][33][34][35] use intricate and costly techniques with lasers, video capture and/or capacitive wave sensors to acquire wave motion. For an analytical comparison, Love and Tait [34,35] compared a 2D pendulum-slosh system using an equivalent mechanical technique with experimental results.…”

Section: Introductionmentioning

confidence: 99%

Equivalent mechanical model of rectangular container attached to a pendulum compared to experimental data and analytical solution

Morais

Lopez

Martins

et al. 2020

J Braz. Soc. Mech. Sci. Eng.

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A tuned liquid damper (TLD) is a passive control device that transfers kinetic energy from the main structure to a liquid sloshing in a tank. The mechanical description of a sloshing liquid contained in a tank requires an intricate mathematical formulation. An alternative technique describes the TLD dynamic behavior as an equivalent mechanical model comprising a series of pendulums or mass-spring systems attached to the tank walls. To validate this approach, this paper compares the discrete model to experimental results and an analytical solution for a rectangular container attached to a pendulum (pendulum-slosh problem). At first, the fundamental oscillation period of the discrete model, representing a rectangular tank, is compared to experimental data and a classic analytical solution. Finally, we compare the pendulum-slosh problem modeled as a discrete model with the analytical solution and experimental results.

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“…In that case, a horizontal laser sheet is observed by up to three cameras and this requires optical access from the bottom of the tank. Similarly, vertical laser sheets used for particle image velocimetry (PIV) can be applied to measure the velocities as well as to detect free surfaces [35][36][37][38][39][40]. Belden and Techet [41] combined this method for air and water to detect the surface.…”

Section: Introductionmentioning

confidence: 99%

Capturing the Motion of the Free Surface of a Fluid Stored within a Floating Structure

Gabl

Steynor

Forehand

et al. 2018

Water

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Large floating structures, such as liquefied natural gas (LNG) ships, are subject to both internal and external fluid forces. The internal fluid forces may also be detrimental to a vessel’s stability and cause excessive loading regimes when sloshing occurs. Whilst it is relatively easy to measure the motion of external free surface with conventional measurement techniques, the sloshing of the internal free surface is more difficult to capture. The location of the internal free surface is normally extrapolated from measuring the pressure acting on the internal walls of the vessel. In order to understand better the loading mechanisms of sloshing internal fluids, a method of capturing the transient inner free surface motion with negligible affect on the response of the fluid or structure is required. In this paper two methods will be demonstrated for this purpose. The first approach uses resistive wave gauges made of copper tape to quantify the water run-up height on the walls of the structure. The second approach extends the conventional use of optical motion tracking to report the position of randomly distributed free floating markers on the internal water surface. The methods simultaneously report the position of the internal free surface with good agreement under static conditions, with absolute variation in the measured water level of around 4 mm. This new combined approach provides a map of the free surface elevation under transient conditions. The experimental error is shown to be acceptable (low mm-range), proving that these experimental techniques are robust free surface tracking methods in a range of situations.

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PIV measurements of flow around an arbitrarily moving free surface

Cited by 27 publications

References 32 publications

A Review of Particle Image Velocimetry for Fish Migration

A Review of Particle Image Velocimetry for Fish Migration

Equivalent mechanical model of rectangular container attached to a pendulum compared to experimental data and analytical solution

Capturing the Motion of the Free Surface of a Fluid Stored within a Floating Structure

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