Criteria for decision making regarding response to accidentally spilled chemicals in packaged form: Hydrodynamic aspects

Cabioc'h, Fanch; Aoustin, Yannick

doi:10.1016/s1353-2561(97)00029-7

Cited by 6 publications

(3 citation statements)

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“…By plotting the leeway rate as a function of the wind-current angle as illustrated in Figure 6, we can note that there appears to be a dependency between these two parameters. This dependency was also found experimentally by Cabioc'h and Aoustin [13] although they did not give an explanation for it.…”

Section: Variation Of the Leeway As A Function Of The Wind-current Anglesupporting

confidence: 49%

“…A second phenomenon reported in the literature is the variation of the leeway as a function of the immersion rate which has been discussed in several articles [12,13]. The formula (29) based on mechanical considerations has been proposed by Daniel et al [12] with r the density ratio of This formula can then be compared with the results hailing from our model as illustrated in Figure 7.…”

Section: Variation Of the Leeway As A Function Of The Immersion Ratementioning

confidence: 78%

“…The forces exerted on the object are its weight P , the buoyant force B , the Coriolis force and the forces generated by the action of the wind on the emerged part, by the current on the immersed part, and by the waves [13].…”

Section: Forces Involvedmentioning

confidence: 99%

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Development of a polar-based method for the calculation of the leeway of floating objects drifting at sea

Ackermann¹,

Kaidi²,

Sergent³

et al. 2022

Comptes Rendus. Mécanique

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Localisation of drifting objects and lost at sea persons is an integral part of search and rescue (SAR) missions. It is thus important to possess effective tools to determine the trajectory of such objects. The method currently used presents some limitations and may prove imprecise in certain cases. The development of a new method based on CFD-generated drag and lift polars is therefore investigated as an alternative. This approach is implemented in a simplified manner for a 40-feet container, and the results compared to the method currently in use. These results, though improvable, appear promising and prove the potential of this approach.Résumé. La localisation des objets flottants et des personnes à la dérive est une part importante des missions de sauvetage en mer, il est dès lors important de disposer d'outils efficaces pour déterminer la trajectoire de tels objets. La méthode actuellement employée présente certaines limitations et peut s'avérer imprécise. Le développement d'une nouvelle méthode basée sur l'utilisation de polaires de coefficients aérodynamiques calculés à l'aide d'outils de mécanique des fluides numérique est considéré en tant qu'alternative. Cette approche est mise en oeuvre pour un conteneur standard. Ces premiers résultats bien que perfectibles semblent prometteurs et témoignent du potentiel de cette approche.

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Section: Variation Of the Leeway As A Function Of The Wind-current Anglesupporting

confidence: 49%

Section: Variation Of the Leeway As A Function Of The Immersion Ratementioning

confidence: 78%

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Development of a polar-based method for the calculation of the leeway of floating objects drifting at sea

Ackermann¹,

Kaidi²,

Sergent³

et al. 2022

Comptes Rendus. Mécanique

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The leeway of shipping containers at different immersion levels

et al. 2012

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The leeway of 20-ft containers in typical distress conditions is established through field experiments in a Norwegian fjord and in open-ocean conditions off the coast of France with a wind speed ranging from calm to 14 ms −1 . The experimental setup is described in detail, and certain recommendations were given for experiments on objects of this size. The results are compared with the leeway of a scaled-down container before the full set of measured leeway characteristics are compared with a semianalytical model of immersed containers. Our results are broadly consistent with the semianalytical model, but the model is found to be sensitive to choice of drag coefficient and makes no estimate of the crosswind leeway of containers. We extend the results from the semianalytical immersion model by extrapolating the observed leeway divergence and estimates of the experimental uncertainty to various realistic immersion levels. The sensitivity of these leeway estimates at different immersion levels are tested using a stochastic trajectory model. Search areas are found to be sensitive to the exact immersion levels, the choice of drag coefficient, and somewhat less sensitive to the inclusion of leeway divergence. We further compare the search areas, thus, found with a range of trajectories estimated using the semianalytical model with only perturbations to the immersion level. We find that the search areas calculated without estimates of crosswind leeway and its uncertainty will grossly underestimate the rate of expansion of the search areas. We recommend that stochastic trajectory models of container drift should account for these uncertainties by generating search areas for different immersion levels and with the uncertainties in crosswind and downwind leeway reported from our field experiments.

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Voyage across Ligeia Mare: Mechanics of sailing on the hydrocarbon seas of Saturn׳s Moon, Titan

Lorenz

2015

Ocean Engineering

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Criteria for decision making regarding response to accidentally spilled chemicals in packaged form: Hydrodynamic aspects

Cited by 6 publications

References 0 publications

Development of a polar-based method for the calculation of the leeway of floating objects drifting at sea

Development of a polar-based method for the calculation of the leeway of floating objects drifting at sea

The leeway of shipping containers at different immersion levels

Voyage across Ligeia Mare: Mechanics of sailing on the hydrocarbon seas of Saturn׳s Moon, Titan

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