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A hybrid model of flooding of the ro-ro ships in damaged conditions

Gerigk M. K., Jachowski J., Sargun J.

TransNav : International Journal on Marine Navigation and Safety of Sea Transportation

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2019

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Vol. 13, no. 2

347--354

EN

The paper presents some results on investigations concerning development of a hybrid model for assessment of performance of the ro-ro ships in damaged conditions. The model is devoted towards assessing the performance of the damaged ro-ro ships at the preliminary stage of design. The key problems associated with preparing of such the model are associated with working out a method of assessment of the damaged ro-ro ships performance, investigating all the phenomena which associated with the flooding process of the damaged ro-ro ships and preparing the model itself. Introducing the method of assessment of the damaged ro-ro ships performance it has been assumed that there is a dependence between the arrangement of internal spaces of a ro-ro ship and flooding process. The major phenomena which have been decided to take into account when considering flooding of the ro-ro ships are the flooding understood as the flow of external water into the data damaged compartment, impact of the flooding water on the ship structure and damaged ro-ro ship motion. Knowing the damaged ro-ro ship motion characteristics in time domain it is relatively easy to assess the damaged ro-ro ship performance according to the heeling angle and assess the ro-ro ship design according to the data arrangement of internal spaces. The last research issue is to investigate if the proposed model may be appropriate tool for assessing the performance of the ro-ro ships in damaged conditions at the preliminary stage of design. The aim of this paper is to show how to incorporate the dynamics of the damaged ro-ro ships when assessing the ship performance and safety at the preliminary stage of design. The basic information on the model for estimation of the damaged ro-ro ship behavior during the flooding process is presented. The complexity of this model is shown depending on the approach applied to consider the flooding process itself. The model is devoted towards assessment of performance of the damaged ro-ro ships and it is still under the development according to a Ph.D. research at the Faculty of Mechanical Engineering Gdańsk University of Technology.

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The CFD method-based research on damaged ship’s flooding process in time-domain

Hu Li-Fen, Qi Huibo, Li Yuemeng, Li Wubin, Chen Shude

Polish Maritime Research

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2019

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nr 1

72--81

EN

The flooding process is one of the main concerns of damaged ship stability. This paper combines the volume of fluid (VOF) method incorporated in the Navier-Stokes (NS) solver with dynamic mesh techniques to simulate the flooding of a damaged ship. The VOF method is used to capture the fluid interface, while the dynamic mesh techniques are applied to update the mesh as a result of transient ship motions. The time-domain flooding processes of a damaged barge and a rectangular cabin model are carried out based on the abovementioned method, and the computational results appear compatible with the experimental data. During the flooding process, the motion of the flooding flow at different stages is observed and compared with that observed in real conditions. The time-domain research of the flooding process is the starting point for subsequent establishment of damaged ship’s roll movement and capsizing the mechanism of dead ship condition in wave.

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Prinatie resenij po regulirobaniu vodnogo vozdejstvia na zalez’

Salavatov T. Sh., Sulejmanov A. A.

Prace Instytutu Nafty i Gazu

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2008

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nr 150 wydanie konferencyjne

741--744

EN

The choice of strategy and tactics in oil and gas fields' development demands a complex analysis to diagnose the current layer condition. The complex analysis makes it possible to define the tendencies of oil and gas production process's development and to make timely decisions in regulating the regimes of producing and injecting wells' performances. The principles of the dynamic approach to regulate and control the development of a field have been developed. The principles are based on cybernetic approach to the analysis and interpretation of the geological and field information, which is acquired while developing oi1 and gas fields. The suggested approach to making decisions in regulating the development processes, which is based on the principles of the dynamic analysis and which considers the unequilibrium processes of oil production and self organization of the layer system, allows to make well-grounded decisions in regulation and choice of strategy of oil and gas fields development.