Whaleback forecastle for reducing green water loading on high-speed container vessels

Varyani, K.S.; Pham, X.P.

doi:10.1080/17445300802057407

Cited by 5 publications

(3 citation statements)

References 7 publications

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“…The first example of a link between experimental and numerical wave modelling concerns green water impact loads on a breakwater of a sailing containership. Similar problems were studied in the past using for instance a dam-break model on a stationary ship [49], with modifications to account for forward speed [50,51] leading to reasonably good results for impact loads in regular waves. Since then, many publications describing CFD methods to analyse extreme wave loading on stationary or moving structures in both regular and irregular waves can be found; see, e.g., [42,[52][53][54][55].…”

Section: Example 1: Reproducing a Single Experimental Wave Event On Amentioning

confidence: 98%

Linking Experimental and Numerical Wave Modelling

Essen

Scharnke

Bunnik

et al. 2020

JMSE

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Experimental or numerical analysis of the response of ships and other floating structures starts with correct environmental modelling. The capabilities of numerical tools are rapidly expanding, but presently the evaluation of extreme events in waves (such as slamming, green water, air-gap exceedance) still requires a combination of experiments and different levels of numerical tools. The present paper describes recent efforts within the Maritime Research Institute Netherlands (MARIN) to improve experimental and numerical wave modelling and especially their combination. The ultimate objective is to be able to reproduce any wave condition from a basin or from sea in numerical tools and vice versa, including a sound treatment of basin effects, numerical effects and statistical variability. The aspects that are of importance in both types of wave modelling are first introduced, after which a number of examples of recent projects is discussed. It can be concluded that important steps were made towards linking experimental and numerical wave modelling, but there are some challenges common to all wave reproductions. Some future planned studies focussing on how to deal with them are discussed as well.

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Section: Example 1: Reproducing a Single Experimental Wave Event On Amentioning

confidence: 98%

Linking Experimental and Numerical Wave Modelling

Essen

Scharnke

Bunnik

et al. 2020

JMSE

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“…The velocity fields of bubbly flow on the deck were compared with the results of dam breaking solution. Varyani and Pham [7] applied a green water protector that had the shape of a whaleback forecastle to reduce the effect of green water effect on the deck of a high-speed container ship. They suggested what the appropriate slope of the whaleback forecastle-type green water protector should be to decrease the green water loading.…”

Section: Introductionmentioning

confidence: 99%

Experimental and Numerical Study of the Behaviour and Flow Kinematics of the Formation of Green Water on a Rectangular Structure

Lee

Jung

Chae

et al. 2016

Brod

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SummaryIn this study, the behaviour of green water impacting on a fixed rectangular structure is studied, and the flow kinematics is investigated with a series of experiments and computational fluid dynamic simulations. The experiments are conducted in a two-dimensional wave flume with the structure under regular wave conditions that are scaled down by the ratio of 1:125 from the BW Pioneer FPSO (Floating production storage and offloading) operated in the Gulf of Mexico. The mean values of the horizontal and vertical velocity profiles are provided for the water and bubbly flow induced by the interaction between the rectangular structure and regular waves. CFD simulations are also performed by STAR-CCM+ using the volume-of-fluid (VOF) method based on the finite-volume method (FVM) and all of CFD results are compared with the experimental data.

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“…Because its optimum structural design requires analysis of the characteristics of green water impact loads and nonlinear breakwater behaviour, these loads have been investigated extensively on the basis of experimental and numerical methods such as computational fluid dynamics (CFD) (Hamoudi and Varyani, 1998;Nielsen and Mayer, 2004;Pham and Varyani, 2005;Ryu, Chang and Mercier, 2007;Varyani and Pham, 2008;Chen and Yu, 2009). Moreover, the structural behaviour with respect to green water impact loads has been studied on the basis of nonlinear structural mechanics, including finite element methods (FEM) (Varyani, Pham and Olsen, 2005;Pham and Varyani, 2006;Pham, 2008). These works incurporate a separated approach involving fluid or structural mechanics; very few studies analyse green water impact loads and structural behaviour with respect to breakwaters.…”

Section: Introductionmentioning

confidence: 99%

Investigation of structural responses of breakwaters for green water based on fluid-structure interaction analysis

Lee¹,

Heo²,

Kim³

et al. 2012

International Journal of Naval Architecture and Ocean Engineeri

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In the present study, the structural response of breakwaters installed on container carriers against green water impact loads was numerically investigated on the basis of the fluid-structure interaction analysis. A series of numerical studies is carried out to induce breakwater collapse under such conditions, whereby a widely accepted fluidstructure interaction analysis technique is adopted to realistically consider the phenomenon of green water impact loads. In addition, the structural behaviour of these breakwaters under green water impact loads is investigated simultaneously throughout the transient analysis. A verification study of the numerical results is performed using data from actual collapse incidents of breakwaters on container carriers. On the basis of the results of a series of numericalanalyses, the pressure distribution of green water was accurately predicted with respect to wave mass and velocity. It is expected that the proposed analytical methodology and predicted pressure distribution could be used as a practical guideline for the design of breakwaters on container carriers.

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Whaleback forecastle for reducing green water loading on high-speed container vessels

Cited by 5 publications

References 7 publications

Linking Experimental and Numerical Wave Modelling

Linking Experimental and Numerical Wave Modelling

Experimental and Numerical Study of the Behaviour and Flow Kinematics of the Formation of Green Water on a Rectangular Structure

Investigation of structural responses of breakwaters for green water based on fluid-structure interaction analysis

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