SPIV measurements around the DELFT 372 catamaran in steady drift

Falchi, Massimo; Felli, Mario; Grizzi, Silvano; Aloisio, Giovanni; Broglia, Riccardo; Stern, Frederick

doi:10.1007/s00348-014-1844-z

Cited by 28 publications

(15 citation statements)

References 34 publications

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“…where the index i =1, 2, 3 indicates the velocity components u, v, and w in the x, y and z direction, In the paper, the uncertainty and convergence analysis was basically the same with that in the reference [10]. The root-mean-square of the velocity as well as Reynolds stresses are second-order small quantities compared to the average velocity which means that the uncertainty and convergence of the root-mean-square of the velocity and Reynolds stresses require more instantaneous velocity samples.…”

Section: Time-averaged Velocity Fieldsmentioning

confidence: 99%

“…This is demonstrated in a previous paper [2]. The method of convergence analysis has referred to Falchi et al [10] and Bendat and Piersol [19,20]. The distribution of the measurement errors is used to determine a 95% confidence interval that contains the true displacement.…”

Section: Time-averaged Velocity Fieldsmentioning

confidence: 99%

“…For bulk carriers, the ballast condition accounts for almost 50% of the total operation time [4]. Our previous paper [2] described in detail the measurement of the wake fields based on the PIV under the design-loading condition, and most of the literature focuses on the flow characteristics around the hulls under the design conditions [5][6][7][8][9][10][11][12][13]. The flow characteristics around the ship under the ballast condition is different from that under the design condition with the change in the draft, inclination angle, and the float status.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Stereo Particle Image Velocimetry Measurements of the Wake Fields Behind A Panamax Bulker Ship Model Under the Ballast Condition

Luo

Jiang

et al. 2020

JMSE

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Particle image velocimetry is applied in this study to measure the wake flow field of a Panamax Bulker ship model under the ballast condition. This investigation revealed that the Froude number is 0.167. The time-averaged velocity, turbulent fluctuations, turbulent kinetic energy (TKE), Reynolds stresses, and vorticity information were measured to perform a comparison with the design condition. The time-averaged velocity contours indicated that the ballast and design conditions have distinct hook-like axial velocity contours; however, they appeared at different positions. The big difference under the ballast condition is that the top of the propeller disk area is near the free surface and a region with strong root mean square velocity fluctuation is formed near the free surface. The TKE, the Reynolds stresses, and the hub cap vortex (Hcv) are all affected by the turbulent velocity fluctuation region under the ballast condition. A strong bilge vortex (Bv) is produced when the water flows through the U-shaped stern for the design and ballast conditions.

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Section: Time-averaged Velocity Fieldsmentioning

confidence: 99%

Section: Time-averaged Velocity Fieldsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Stereo Particle Image Velocimetry Measurements of the Wake Fields Behind A Panamax Bulker Ship Model Under the Ballast Condition

Luo

Jiang

et al. 2020

JMSE

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show abstract

“…The uncertainty analysis in this paper is also the uncertainty of the PIV measurement system. The analysis method that is used in this paper can be referred to reference [18].…”

Section: Piv Measurement Designmentioning

confidence: 99%

“…Guo and Gong [16,17] used PIV to test the fine flow field of bulk carrier and waterjet-propeller ship in the towing tank, and the uncertainty of measurement was analyzed. Aiming at the uncertainty factors of PIV in towing tank, Falchi and Felli [18,19] generally analyze and explain the uncertainty of PIV measurement system itself.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic Interactions between Bracket and Propeller of Podded Propulsor Based on Particle Image Velocimetry Test

Zhao

Guo

et al. 2019

Water

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In this study, particle image velocimetry was used to measure the fine flow-field characteristics of an L-type podded propulsor in various working conditions. The flow-field details at different cross-sections between the propeller and the inclined bracket were compared and analyzed, allowing for more intuitive comparison of the flow-field characteristics of L-type podded propulsors. The interference mechanisms among the propeller, pod, and bracket of the L-type podded propulsors at different advance coefficients, deflection angles, and deflection directions were investigated in depth. The results of this study can serve as reference material and provide technical support for the design and practical shipbuilding application of L-type podded propulsors. Therefore, the results have theoretical significance and practical engineering value.

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Flow Around Ships and Underwater Vehicles

Iafrati

2017

Encyclopedia of Maritime and Offshore Engineering

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In this contribution, some aspects of the flow generated by surface or underwater vehicles are discussed. The content is a synthetic review of the literature in the field. The basic features, which are already well established, are briefly recalled, whereas attention is mainly devoted to the most recent research advances on those hydrodynamic phenomena that are not yet fully understood or are at the research frontier of the field. These are the breaking of the bow wave and the subsequent vorticity generation, the separated turbulent flow at the stern, the effect of the scale on the flow characteristics, the flow about propellers and the mutual interaction of the propeller with ship hull and rudders, and the flow about ships in maneuver or in unsteady motion. For underwater vehicles, the discussion concerns the flow generated by a submarine in steady motion in open water or close to the free surface, the flow about the propeller and the interaction with hull, sail, and rudder. Finally, some considerations are given for supercavitating vehicles.

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SPIV measurements around the DELFT 372 catamaran in steady drift

Cited by 28 publications

References 34 publications

Stereo Particle Image Velocimetry Measurements of the Wake Fields Behind A Panamax Bulker Ship Model Under the Ballast Condition

Stereo Particle Image Velocimetry Measurements of the Wake Fields Behind A Panamax Bulker Ship Model Under the Ballast Condition

Hydrodynamic Interactions between Bracket and Propeller of Podded Propulsor Based on Particle Image Velocimetry Test

Flow Around Ships and Underwater Vehicles

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