The Experts below are selected from a list of 51 Experts worldwide ranked by ideXlab platform

Teemu Manderbacka - One of the best experts on this subject based on the ideXlab platform.

  • The impact of the inflow momentum on the transient roll response of a damaged ship
    Ocean Engineering, 2016
    Co-Authors: Teemu Manderbacka, Pekka Ruponen
    Abstract:

    Dynamics of an abrupt flooding case are studied by comparing fully dynamic and quasi-static flooding simulation methods. Transient asymmetric flooding is traditionally modelled by dividing the Compartment into smaller parts with bulkheads representing different obstructions in the Flooded Compartment. The implications of this assumption are studied by varying the size of the opening on the dividing bulkhead. The importance of the inflooding jet to the response is shown. The jet i.e. the inflooding momentum flux is modelled as force acting on the lumped mass. When the Flooded Compartment does not have significant obstructions it is important to account for the inflooding momentum flux.

  • Model experiments of the transient response to flooding of the box shaped barge
    Journal of Fluids and Structures, 2015
    Co-Authors: Teemu Manderbacka, Pekka Ruponen, Jakke Kulovesi, Jerzy Matusiak
    Abstract:

    Coupling of the Flooded water and ship motions was studied experimentally.Roll decay tests for one Flooded Compartment and transient abrupt floodingtests were performed for the box shaped barge model. The tests were conductedto obtain information on the flooding process for the developmentof numerical tools and to provide validation data. Quantitative values onthe effect of Flooded water on the roll damping were obtained. Flooded waterbehaves in a different manner in undivided and divided Compartments.Flooded water in divided Compartment increases roll damping significantly.In undivided Compartment roll damping was high at low amount of Floodedwater. For higher amounts damping was of the same order as for the intactmodel. Initial flooding is a complex process where the ship and Floodedwater motions are coupled. Propagation of the flooding water inside theCompartment, at a dam-break type abrupt flooding, was studied by trackingthe surface of the Flooded water. Image processing algorithm was used to obtain the tracked surface. Flooded water volume and its center of gravity were estimated from the tracked surface. Different internal layouts of theFlooded Compartment can lead to a totally different roll response. The infloodingjet plays an important role on the response in case of the undividedCompartment. While, for a divided Compartment, asymmetric flooding dueto the obstructions, causes high heel angle on the damage side.Peer reviewe

Jerzy Matusiak - One of the best experts on this subject based on the ideXlab platform.

  • Model experiments of the transient response to flooding of the box shaped barge
    Journal of Fluids and Structures, 2015
    Co-Authors: Teemu Manderbacka, Pekka Ruponen, Jakke Kulovesi, Jerzy Matusiak
    Abstract:

    Coupling of the Flooded water and ship motions was studied experimentally.Roll decay tests for one Flooded Compartment and transient abrupt floodingtests were performed for the box shaped barge model. The tests were conductedto obtain information on the flooding process for the developmentof numerical tools and to provide validation data. Quantitative values onthe effect of Flooded water on the roll damping were obtained. Flooded waterbehaves in a different manner in undivided and divided Compartments.Flooded water in divided Compartment increases roll damping significantly.In undivided Compartment roll damping was high at low amount of Floodedwater. For higher amounts damping was of the same order as for the intactmodel. Initial flooding is a complex process where the ship and Floodedwater motions are coupled. Propagation of the flooding water inside theCompartment, at a dam-break type abrupt flooding, was studied by trackingthe surface of the Flooded water. Image processing algorithm was used to obtain the tracked surface. Flooded water volume and its center of gravity were estimated from the tracked surface. Different internal layouts of theFlooded Compartment can lead to a totally different roll response. The infloodingjet plays an important role on the response in case of the undividedCompartment. While, for a divided Compartment, asymmetric flooding dueto the obstructions, causes high heel angle on the damage side.Peer reviewe

Maria Acanfora - One of the best experts on this subject based on the ideXlab platform.

  • An Experimental Investigation on the Dynamic Response of a Damaged Ship with a realistic arrangement of the Flooded Compartment
    Applied Ocean Research, 2017
    Co-Authors: Maria Acanfora, F. De Luca
    Abstract:

    Abstract The dynamics of a damaged ship in waves is a complex phenomenon regarding fluid and structure interactions. Flooded water motions in the damaged Compartment could be influenced by decks, obstructions and obstacles in the Compartment. This becomes particularly relevant in case of flooding in the engine room that is usually characterized by the presence of large objects such as engines and machineries. In such cases the possibility to better understand the behavior of a damaged ship, influenced by the fluid and structure interactions, could provide novel outcomes and thus enhance the damaged ship safety. In this paper an experimental campaign is conducted on a passenger ferry hull. The effects of obstacles in the engine room Compartment, such as decks and engines, on ship roll responses, are studied. Roll decay in still water and steady roll responses in beam regular waves at zero speed are measured for the empty Compartment and for the Compartment with obstructions, as defined above. The main outcomes from the conducted experiments disclose a mitigation of the resonant behavior of the coupled system, ship with damaged Compartment, by having engine shapes occupying the Flooded engine room. Moreover it is possible to observe how the resonant frequency of the ship modifies having a more realistic arrangement of damaged Compartment and how motion RAOs and roll decay characteristics modify accordingly.

  • A simulation model for ship response in flooding scenario
    Proceedings of the Institution of Mechanical Engineers Part M: Journal of Engineering for the Maritime Environment, 2016
    Co-Authors: Maria Acanfora, Antonio Cirillo
    Abstract:

    Recent ship damages underline the importance of an accurate intact and damage stability analysis. The stability of ships is presently determined by applying quasi-static methods, neglecting dynamic effects; for flooding scenarios, flow calculations are not carried out either. In general, for damage cases, water dynamics inside the Compartment affect ship motions. It has been observed that some kind of vessels could experience large roll motions due to the sudden water ingress after damage. In this article, a non-linear tool for damage stability evaluation is presented, including water dynamics in a Flooded Compartment. In particular the transient stage of flooding is investigated. The Flooded water has been treated using the lumped mass approach. A new method has been developed and applied in this article in order to model the water motions: the freesurface is assumed to be no more horizontal but dependent on ship and Flooded water accelerations. The developed method is intended to be an intermediate appr...

Pekka Ruponen - One of the best experts on this subject based on the ideXlab platform.

  • The impact of the inflow momentum on the transient roll response of a damaged ship
    Ocean Engineering, 2016
    Co-Authors: Teemu Manderbacka, Pekka Ruponen
    Abstract:

    Dynamics of an abrupt flooding case are studied by comparing fully dynamic and quasi-static flooding simulation methods. Transient asymmetric flooding is traditionally modelled by dividing the Compartment into smaller parts with bulkheads representing different obstructions in the Flooded Compartment. The implications of this assumption are studied by varying the size of the opening on the dividing bulkhead. The importance of the inflooding jet to the response is shown. The jet i.e. the inflooding momentum flux is modelled as force acting on the lumped mass. When the Flooded Compartment does not have significant obstructions it is important to account for the inflooding momentum flux.

  • Model experiments of the transient response to flooding of the box shaped barge
    Journal of Fluids and Structures, 2015
    Co-Authors: Teemu Manderbacka, Pekka Ruponen, Jakke Kulovesi, Jerzy Matusiak
    Abstract:

    Coupling of the Flooded water and ship motions was studied experimentally.Roll decay tests for one Flooded Compartment and transient abrupt floodingtests were performed for the box shaped barge model. The tests were conductedto obtain information on the flooding process for the developmentof numerical tools and to provide validation data. Quantitative values onthe effect of Flooded water on the roll damping were obtained. Flooded waterbehaves in a different manner in undivided and divided Compartments.Flooded water in divided Compartment increases roll damping significantly.In undivided Compartment roll damping was high at low amount of Floodedwater. For higher amounts damping was of the same order as for the intactmodel. Initial flooding is a complex process where the ship and Floodedwater motions are coupled. Propagation of the flooding water inside theCompartment, at a dam-break type abrupt flooding, was studied by trackingthe surface of the Flooded water. Image processing algorithm was used to obtain the tracked surface. Flooded water volume and its center of gravity were estimated from the tracked surface. Different internal layouts of theFlooded Compartment can lead to a totally different roll response. The infloodingjet plays an important role on the response in case of the undividedCompartment. While, for a divided Compartment, asymmetric flooding dueto the obstructions, causes high heel angle on the damage side.Peer reviewe

Francescutto A. - One of the best experts on this subject based on the ideXlab platform.

  • Stability after Damage in a Seaway for a RO-RO Passenger Ship
    place:London, 1991
    Co-Authors: Contento G., Francescutto A.
    Abstract:

    In this paper, the existing criteria of stability for ships both intact and with damage are reviewed from a critical point of view. It is found desirable to develop a time domain simulation procedure that allows a deeper analysis of the dynamic transient phases of the motion, especially in damaged conditions. At the same time, the action of a regular train of waves from arbitrary direction and the sloshing in the Flooded Compartment is considered explicitly. The possible consequences for the case of a RoRo passenger ship are indicated