engleski

Free-Outflow Modelling in the Linearised Progressive Flooding Simulation Methodology

In linearised progressive flooding simulations, special attention shall be given to the damage and internal openings modelling. The steady Bernoulli equation, which is usually employed in quasistatic progressive flooding simulations, applies to the deeply-submerged case only. However, during progressive flooding of a damaged ship, free-outflow often occurs. In a linearised simulation tool, the integration of the different hydraulic behaviour related to free-outflow is not straightforward, since affects the linearisation process of the governing equations. Nevertheless, to assure the reliability and accuracy of the simulation technique, it is mandatory to consider the free-outflow case too. In this work, a methodology is presented to extend the linearised progressive flooding simulation technique to cope with free-outflow. The object is achieved through the introduction of a correction coefficient on the free-outflow area of the opening that is computed at each time step during differential equations integration. The proposed method is validated with a model scale flooding test highlighting also the errors that arise by discarding the free-outflow modelling.

progressive flooding ; fast simulation ; linearisation ; free-outflow

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