A moving PIV system for ship model test in a towing tank

Chen, Jeng Horng; Chang, Che Chun

doi:10.1016/j.oceaneng.2005.09.011

Cited by 7 publications

(10 citation statements)

References 9 publications

(8 reference statements)

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“…A more detailed description of the PIV setup is provided by Schmidt et al (2017). Some examples for other PIV setups in a water towing tank include (Tukker et al 2007;Gui et al 2001;Chen and Chang 2006;Jacobi et al 2016;Corkery et al 2018;Wilhelmi et al 2018;Cleaver et al 2013). Recommended procedures and guidelines for PIV measurements carried out in water are provided by the ITTC (ITTC 7.5-01-03-03 2008; ITTC 7.5-01-03-04 2014).…”

Section: Test Rig Setup and Flat Plate Modelmentioning

confidence: 99%

“…Ensemble averaging is applied on periodic flows to increase the SNR. Stochastic noise decreases with √ N where N is the number of data sets for the averaging process (Wulff 2006). Therefore, an increase in data quality is linked to an increase in testing time.…”

Section: Data Qualitymentioning

confidence: 99%

“…Steel tubes are the superior choice to keep the speed of sound high. An example is given by Wulff (2006) based on Eq. 8, where E water is the volume modulus of water, E tube the volume modulus of the tube material, D the tube's inner diameter, and s the tube's wall thickness.…”

Section: Pressure Measurementsmentioning

confidence: 99%

“…Alternatively, silicon oil may be used to fill the sensor cavity because it is a good pressure transmitting fluid. Wulff (2006) utilizes silicon oil to prevent leaking of fluid in the recess in front of a surface mounted pressure sensor when changing configurations. In the present study, silicon oil (50 CST) is used to fill the pressure sensor cavity with a syringe as explained before.…”

Section: De-airing Of Pressure Sensorsmentioning

confidence: 99%

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Challenges and procedures for experiments with steady and unsteady model velocities in a water towing tank

et al. 2021

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Challenges for steady and unsteady model motion in a large water towing tank and procedures to overcome them are the focus of the presented work. Some challenges are attributed to experiments conducted in water, whereas others are uniquely ascribed to a towing tank facility. Data convergence and outlier detection are studied based on the phase averaged pressure in order to ensure proper data quality. Pressure measurements are performed with non-surface mounted sensors. Therefore, inertia effects are detrimental when the attached tubing is not fully de-aired. A procedure for de-airing the pressure sensor cavity and its tubing is described. An iterative approach is developed that compensates for nonlinear distortion of the model’s velocity profile. Further, vibration effects are examined by distinguishing mechanical and flow-induced frequencies that scale with the instantaneous model velocity. Sloshing waves are excited, which are a function of the water basin size. The first sloshing mode defines the required sensor offset time in between test cases when prevailing sloshing waves have not fully decayed. This appropriate selection of sensor offset time reduces data scatter and enables a reasonable waiting time in between test cases. A skim plate installed just below the water surface offers a potential solution to alleviate surface wave effects over the model.

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Section: Test Rig Setup and Flat Plate Modelmentioning

confidence: 99%

Section: Data Qualitymentioning

confidence: 99%

Section: Pressure Measurementsmentioning

confidence: 99%

Section: De-airing Of Pressure Sensorsmentioning

confidence: 99%

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Challenges and procedures for experiments with steady and unsteady model velocities in a water towing tank

et al. 2021

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“…Kim et al (2001) measured the forward resistance, waves and flow velocity (through Pitot tubes) around different models with bulb in a towing tank. Recently, numerous studies have focused on the characterization of the flow around ship hulls using Particle Image Velocimetry measurements in towing tanks [Chen et al (2006)], such as in circulating tanks [Lee et al (2003), ] and cavitation tunnels [Paik et al (2007)]. In particular, the area near the bow has been investigated by optical methods in order to characterize the deformation of the free surface [Gomit et al (2013), Gomit et al (2015)].…”

Section: Introductionmentioning

confidence: 99%

A 3D study of the bubble sweep-down phenomenon around a 1/30 scale ship model

Mallat

Germain

Billard

et al. 2018

European Journal of Mechanics - B/Fluids

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The bubble sweep-down phenomenon around oceanographic research vessels generates acoustic disturbances. A specific experimental protocol in a wave and current circulating tank is used to study this phenomenon around a 1/30 scale ship model in a configuration with current, waves and ship motions. 3D visualizations of the bubble clouds and Stereo-PIV (Particle Image Velocimetry) measurements results, both obtained in the bow vicinity of the ship model, are presented in this paper. The behaviour of the breaking wave with bubble generation is studied and the spatial evolution of the bubble clouds is investigated. It is demonstrated that the bubble cloud generation is mainly conditioned by the ascending vertical velocity of the flow near the bow. It is observed that the bubble clouds are propagated in the flow direction with a horizontal expansion which is non negligeable, reaching a close position to the hull. The overall results provide new elements for the study and the understanding of the phenomenon compared with previous 2D studies. Highlights ► Air entrainment is studied around a 1/30 Scale Ship Model. ► 3D bubble cloud characteristics are determined. ► PIV measurements and POD analysis allow to study the air bubble generation.

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