Simulating Costa Concordia

Discussion in 'Boat Design' started by APP, Jan 17, 2012.

  1. APP
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    APP Junior Member

    Yes. How many meters GM would be a satisfactory number for you. For example what could be the GM of the Nimitz of your picture?

    Regards
    APP
     
  2. IEWinkle
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    IEWinkle Retired Naval Architect

    A much simpler answer is in my post no 20 above
     
  3. SheetWise
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    SheetWise All Beach -- No Water.

    I have read several "short" papers and book chapters about stability calculations -- is there any accessible literature dedicated to the subject?

    Edit: By accessible, I mean that it starts in the beginning -- and doesn't assume the reader is a Naval Architect simply using it for reference ;)
     
    Last edited: Jan 28, 2012
  4. IEWinkle
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    IEWinkle Retired Naval Architect

    I sympathise with the problem of getting to grips with all aspects of intact and damage stability of surface ships. The best starting point is to look for texts preparing the professional mariner for his certification examinations which are generally written in a slightly more straightfoward way than the typical naval architecture text book.

    If you can find it, I would also recommend 'Naval Architecture' by Brian Baxter (now long out of print) in the 'Teach Yourself Books' series (publisher English Universities Press) but sometimes available second hand. This book was written in a very straightforward style and reflects the notes given to 1st year Naval Architecture students at the University of Newcastle upon Tyne in the 1960's.

    Hope this helps.
     
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  5. IEWinkle
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    IEWinkle Retired Naval Architect

  6. SheetWise
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    SheetWise All Beach -- No Water.

    Thank you! Under $50 on Amazon (4 left).

    Amazing that books published in the 60's are loooong out of print. It seems so recent ;)
     
  7. APP
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    APP Junior Member

    Stability is an exciting subject. Look first in the Stability Section of this Forum.
    Then start searching Stability matters with Google, search also PDFs to download. Read and discard difficult paragraphs/subjects for later. It will take a while to find what you need.

    Another way, if you have time:

    1) Download Hydromax (Demo Maxsurf software). There you will find the Hydromax Help Manual PDF. Read it, it explains also few points, when you do not understand something, stop and search it with google. Maybe there could be also another stability software with nice help and explaining files.

    2) Do the same with Stability Rules of a classification Society (e.g. BV, GL, etc.). Google to find explanations on obscure points. Do it with two different Societies, these say the same things but one may explain something in more detail.

    Once you have done 1) and 2) above, I think you shall be almost a professional in Stability.

    Best Regards
    APP
     
  8. IEWinkle
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    IEWinkle Retired Naval Architect

    Not as worth watching as I thought it should have been. It did confirm the blackout as 10 minutes after the impact which would correspond to both engine rooms having been heavily flooded by then. It showed a number of watertight doors in what appeared to be the crew accommodation under the passenger decks left open in the early stages of the crisis and it seems that there was no organised attempt to clear these spaces and seal the bulkheads. The biggest technical mistake was showing a distribution of only 6 transverse bulkheads along the ship's length with 3 flooded - there should have been about 15 with 3 or possibly 4 flooded!
     
  9. APP
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    APP Junior Member

    A little question please: Where did you see a distribution of only 6 bulkheads. You found a drawing? Thanks.
    Regards
    APP

    PS: From Lloyds List: "......... Clearly at some point, however, the vessel listed permanently to starboard. Experts are already suggesting this was because the water ingress from the damaged port side went over to the starboard side, or because once the vessel approached the land it encountered further rocks giving it in effect a nudge to starboard. ....."
     
  10. mat8iou
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    mat8iou Junior Member

    On the Channel 4 programme, http://www.channel4.com/programmes/terror-at-sea-the-sinking-of-the-concordia/4od
    Just before 12 minutes in, it says that modern ships are typically 7 compartments & shows a diagram of this. It then states that 3 of these were breached.

    I know for a fact though (from reliable sources) that the ship had 12 compartments.
     
  11. IEWinkle
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    IEWinkle Retired Naval Architect

    Is there any chance your reliable source has a diagram that could be passed on showing the distribution of these bulkheads?
     
  12. IEWinkle
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    IEWinkle Retired Naval Architect

    I think you will find that the list to starboard was earlier a list to port - as indicated in the passenger testimony. At some point the vessel flipped from port to starboard - possibly as it grounded. This clearly indicated the presence of metacentric instability which implies that the list was in fact a 'loll'. This would be allowable within the SOLAS regs as long as its damaged stability range and GZ characterstics were adequate. It has nothing to do with water moving about inside the vessel and is to be anticipated in any vessel of this type with a very large extent of flooding.
     
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  13. mat8iou
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    mat8iou Junior Member

    They definitely have drawings, but I doubt that they would be able to share them due to NDAs that they are signed up to etc unfortunately.
     
  14. SheetWise
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    SheetWise All Beach -- No Water.

    Sounds a bit like a Black Art ...

    Thanks for the direction.
     

  15. seewolfbarney
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    seewolfbarney Junior Member

    Simulating a Fatal Turn - "Estonia"

    There is a very interesting publication:

    http://www.spiegel.de/international/europe/0,1518,527875,00.html

    I am highly impressed by this message to regulators and NAs:

    Quote
    "The simulation illustrates why hundreds of desperate people never made it. For the first time, the Hamburg team, aided by the developers of Advanced evacuation simulation software, was able to take into account the effects of an increasing list on the ability of passengers and crew members to get out of the ship.

    According to the researchers, the data they obtained diverged "substantially" from the IMO standards. The calculations for the virtual Estonia show that when a ship lists, its evacuation routes become almost impassable. In the simulation, only 278 of the 989 people on board the ship managed to reach the open decks. The ferry became a coffin for the rest.
    Unquote
     
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