scholarly journals ‘Competitors in the surf-riding contest’: battle as theme in the first three surf novels

TEXT ◽  
2021 ◽  
Author(s):  
Jake Sandtner ◽  
Nigel Krauth
Keyword(s):  
Surf Riding

Dynamic Instability in Quartering Seas—Part II: Analysis of Ship Roll and Capsize for Broaching

1996 ◽  
Vol 40 (04) ◽  
pp. 326-336
Author(s):  
K. J. Spyrou
Keyword(s):  
Design Methodology ◽  
Dynamic Instability ◽  
Global Analysis ◽  
Theoretical Background ◽  
Dynamic Effects ◽  
Arbitrary Initial Condition ◽  
Forced Turn ◽  
Surf Riding ◽  
Ship Roll ◽  
Ship Capsize

In earlier studies we have analyzed the phenomena which can generate loss of ship controllability in astern seas. In this paper we examine how the yaw instability associated with broaching can lead to roll instability and ship capsize. The dynamic effects responsible for capsize during the forced turn of broaching do not have their origin in the customary roll equation but are the result of interactions with other motions of the ship. Stability studies based solely on the roll equation are thus clearly inappropriate for this case where a multidimensional approach is deemed necessary. After presenting the theoretical background we set out a multi-degree method of global analysis which is based on transient maps. We apply this method to clarify how capsize occurs during the escape from surf-riding and also during transients from arbitrary initial condition of the ship. Our study establishes the connection between speed, heading, automatic control parameters and capsize. The proposed method can be useful in the context of a design methodology for minimizing the risk of ship capsize in astern seas.

scholarly journals OPTIMUM CONDITIONS FOR SURF-RIDING AND INVESTIGATION OF DISAPPEARANCE OF PAST SURF SPOT AT MAEBARA BEACH

2000 ◽  
Vol 16 ◽  
pp. 553-558
Author(s):  
Shu-suke WATANABE ◽  
Satoquo SEINO ◽  
Takaaki UDA ◽  
Masumi SERIZAWA ◽  
Toshiro SAN-NAMI ◽  
...  
Keyword(s):  
Optimum Conditions ◽  
Surf Riding

Improved prediction of the threshold of surf-riding of a ship in steep following seas

2010 ◽  
Vol 37 (13) ◽  
pp. 1103-1110 ◽  
Author(s):  
Wan Wu ◽  
Kostas J. Spyrou ◽  
Leigh S. McCue
Keyword(s):  
Following Seas ◽  
Surf Riding

scholarly journals Surging of Large Amplitude and Surf-riding of Ships in Following Seas

1987 ◽  
Vol 1987 (162) ◽  
pp. 152-162 ◽  
Author(s):  
Makoto Kan ◽  
Toshihiko Saruta ◽  
Mikio Yasuno ◽  
Yasuyuki Yamakoshi ◽  
Shiro Suzuki
Keyword(s):  
Large Amplitude ◽  
Following Seas ◽  
Surf Riding

Dynamic Instability in Quartering Seas: The Behavior of a Ship During Broaching

1996 ◽  
Vol 40 (01) ◽  
pp. 46-59 ◽  
Author(s):  
K. J. Spyrou
Keyword(s):  
Steady State ◽  
Transient Analysis ◽  
Dynamic Instability ◽  
Dynamical Analysis ◽  
Wave Excitation ◽  
Periodic Motions ◽  
Regular Waves ◽  
Limit Sets ◽  
Diffraction Wave ◽  
Surf Riding

The dynamic stability of ships encountering large regular waves from astern is analyzed, with focus on delineating the specific conditions leading to the uncontrolled turn identified as broaching. The problem's formulation takes into account motions of the actively steered or controls-fixed vessel in surge-sway-yaw-roll with consideration of Froude-Krylov and diffraction wave excitation. Dynamical analysis of surf-riding is carried out for the general case of quartering waves, exploring the route periodic motions—surf riding, loss of stationary stability, turn, capsize. Steady-state and transient analysis is carried out in the system's multidimensional state-space in order to identify all existing limit sets and locate attracting domains. Broaching from periodic motions is also a part of the investigation.

Experimental Research on the Surf-Riding Region for High Speed Vessels

2015 ◽  
Author(s):  
Atsuo Maki ◽  
Yoshiki Miyauchi
Keyword(s):  
Experimental Research ◽  
High Speed ◽  
Safety Assessment ◽  
Estimation Methods ◽  
Model Experiments ◽  
Size Limitation ◽  
Analytical Estimation ◽  
Free Running ◽  
Surface Combatant ◽  
Surf Riding

It is well known that surf-riding phenomenon is the prerequisite of the broaching-to in following and quartering conditions. For the safety assessment of the fast vessel such as surface combatant sand patrol crafts, the estimation of the surf-riding condition is important. Therefore, so far several experimental efforts have been made. However, in these previous researches, the free running model experiments in high speed region, i.e.up to Froude number of 0.6 or 0.7, have not been conducted because of tank size limitation. As shown in this paper, there are occurrence and disappearance boundaries of surf-riding in lower and faster region, respectively. In our study, free running model experiments are carried out in high speed region, and then both boundaries are experimentally obtained. By using obtained results, the analytical estimation methods proposed by the authors can be well validated. Furthermore, the free running model experiments in irregular seas are also conducted. Then, surf-riding phenomenon in irregular seas is also discussed.

Hydrodynamic Aspects on Vulnerability Criteria for Surf-Riding of Ships

2014 ◽  
Vol 66 (2) ◽  
Author(s):  
Yuto Ito ◽  
Naoya Umeda ◽  
Hisako Kubo
Keyword(s):  
Empirical Formula ◽  
Global Bifurcation ◽  
Quantitative Agreement ◽  
Hydrodynamic Theory ◽  
Safety Level ◽  
Slender Body Theory ◽  
Model Experiments ◽  
Intact Stability ◽  
Surf Riding ◽  
Wave Induced

For developing the International Maritime Organization (IMO) second-generation intact stability criteria regarding broaching, draft vulnerability criteria for surf-riding were agreed at the IMO in 2012. This paper describes their hydrodynamic backgrounds with captive model experiments for seven ships, a hydrodynamic theory and a random process theory. In the first level vulnerability criteria, a ship is required to reduce her Froude number of less than 0.3 in case of severe following waves. For predicting the surf-riding threshold in a global bifurcation theory, it is necessary to precisely estimate wave-induced surge force. Thus, the authors execute captive model experiments for three ships in model basins. As a result, we confirmed that the Froude-Krylov calculation overestimates the amplitude of wave-induced surge force so that an empirical formula for regulatory application is presented. For investigating the reason of this discrepancy, a slender body theory assuming low encounter frequency is applied to the situation where a ship runs with a wave. This theory suggests that change of wave-making resistance due to incident wave could reduce the amplitude of the wave-induced surge force and quantitative agreement with model experiment requires the use of CFD or an empirical formula. Thus, the authors can recommend the use of experimental correction formula for the vulnerability criteria. Based on sample calculation results of surf-riding probability of six ships in the North Atlantic, the safety level to be required in the criteria is proposed.

Numerical Simulation and Experimental Validation on the Surf-Riding and Broaching of a Fishing Vessel

2016 ◽  
Author(s):  
Liwei Yu ◽  
Ning Ma ◽  
Sheming Fan ◽  
Peiyuan Feng ◽  
Xiechong Gu
Keyword(s):  
Numerical Simulation ◽  
Numerical Simulations ◽  
Model Test ◽  
Periodic Motion ◽  
Following Seas ◽  
Weakly Nonlinear ◽  
Model Experiments ◽  
Time Histories ◽  
Wave Heights ◽  
Surf Riding

Model experiments and numerical simulations on the surf-riding and broaching in following seas of a 42.5m long purse seiner are conducted. Firstly, the free running model experiments with various ship speeds and wave heights are performed in the towing tank to reproduce the phenomena of surf-riding and broaching. Then, the 6-DOF weakly nonlinear unified model is applied to simulate the motions of the purse seiner with the same cases as the model experiments. Through the comparison between results of model test and numerical simulation, the occurrence conditions of periodic motion, surf-riding and broaching are roughly determined. Finally, it is found that although it is difficult for the numerical simulations to get the same time histories as model tests, the modes of motion (periodic motion, surf-riding or broaching) obtained from the numerical simulations agree well qualitatively and quantitatively in part with the model test results.

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