Bulbous Bow Modelling- Maxsurf Modeler

Discussion in 'Software' started by Suhas, Apr 4, 2020.

  1. Suhas
    Joined: Apr 2020
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    Location: Kochi, India

    Suhas Junior Member

    Hi,
    I am trying to model a container ship hull form based on an existing lines plan. As you may notice from the attached image, Im having issues at the bulbous bow and skeg end while generating trimeshes and NURB surfaces. Please advice how I can fix these issues.
    Thanks in advance.
     

    Attached Files:

  2. TANSL
    Joined: Sep 2011
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    TANSL Senior Member

    Try to define the bulb as a surface, independent of the rest of the hull.
     
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  3. Suhas
    Joined: Apr 2020
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    Location: Kochi, India

    Suhas Junior Member

    Hi TANSL,
    Im quite new to Maxsurf Modeler. I have 2 section data and a longitudinal profile for the bow that I want to model. Once I have modeled the Hull, what are the steps to follow inorder to add a bulbous bow to it as a separate surface. I dont quite understand the steps to be followed. Is there any tutorial videos that I can refer?
     
  4. TANSL
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    TANSL Senior Member

    Do as many people do, create the model with other software and export it to Maxsurf.
     
  5. Alexander Peter Bromley
    Joined: Apr 2020
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    Location: South Africa

    Alexander Peter Bromley Junior Member

    What i do is split the hull up completely into two seperate sections, under geometry start an aft and a foreward section file and join them through bonding. It end up simplifying your view in the body plan.

    For the hull have three seperate surfaces for the bottom, turn of the bilge and then top sides.
     
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  6. Alexander Peter Bromley
    Joined: Apr 2020
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    Alexander Peter Bromley Junior Member



    Take a look at this, this helped me a lot.
     
  7. Alexanov
    Joined: Feb 2003
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    Location: Norway Sola

    Alexanov Senior Member

    So, to make bulbous bow in Maxsurf we have to use another software?
     
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  8. Alexanov
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    Alexanov Senior Member

    Yes. It can be a solution, but if we are talking about hight quality lines, such splitting can make unwanted changes of curvature where patches connected to each other.
     
  9. TANSL
    Joined: Sep 2011
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    TANSL Senior Member

    No, of course not, with Maxsurf you can create bow bulbs and everything you want. The problem is that doing it, with sufficient accuracy, may take more time than doing all the naval architecture calculations. Thanks to Maxsurf, many Rhino licenses have been sold for the naval sector.
    Let me tell you an anecdote. The first project I tried to do with Maxsurf, a 24-meter fishing boat, was so difficult for me that I asked the dealer in Madrid for help. After several days they told me they had sent it to New Zealand, to the central office. Two days later they sent me the model, perfectly well done, with which I got out of trouble, and I greatly appreciated it. Speaking to the representative about the difficulties with the modeling module, he advised me to make the models with Rhino because they could be easily exported to MaxSurf. Take the consequences you want.
     
  10. TANSL
    Joined: Sep 2011
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    TANSL Senior Member

    That is precisely what some softwares do not take into account. In the union of two patches, not only the first derivative (the tangents) but also the second derivatives (the curvatures) must coincide.
     
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  11. Alexanov
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    Alexanov Senior Member

    Even if everything take into account, position and shape of common boundary line is very important. Usually first you make one patch, than connect another one with tangency and curvature, but most optimal is balance tangents and curvature from both sides of this boundary. Very often it is not easy task.
     

  12. Alexanov
    Joined: Feb 2003
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    Location: Norway Sola

    Alexanov Senior Member

    Nice! That is probably why is so difficult to find video demonstration of hull modeling from scratch. Usually it’s start from existing model with some small changes of from hull taken from library.)))
     
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