Michlet 8.06 Released

Discussion in 'Software' started by Leo Lazauskas, Oct 18, 2005.

  1. Leo Lazauskas
    Joined: Jan 2002
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    Location: Adelaide, South Australia

    Leo Lazauskas Senior Member

    Michlet 8.06 is now available for free from:
    http://www.cyberiad.net/michlet.htm.

    Some minor modifications have been made in preparation for better
    communication with Martijn van Engeland's program FREE!Ship.

    * Maximum ship displacement has been increased to million tonnes.

    * Maximum speed has been increased to 52.0 m/sec for no particular
    reason, except that "Optimal, 100-knot, million tonne cat" sounds
    cool.

    * The method of calculating Michell P,Q functions in infinite
    depth water has been improved. These functions are now exact for
    hulls with piece-wise quadratic waterlines and piece-wise
    quadratic sections, for example, parabolic struts and Wigley
    hulls. For some optimisation problems that involve wave-making but
    not skin friction, very few stations and waterlines are required
    to represent the hull. The tet6.mlt tetrahull example that comes
    with Michlet runs about 10 to 15 times faster with this
    improvement.

    * Updated skin friction line based on Grigson's Method. Changes
    are fairly minor and will be only be apparent at low Reynolds
    numbers, typically below about 2 million.

    * Uncrippled the "Ship ID" objective function. GODZILLA can search
    for a hull or arrangement of hulls that makes a user-specified
    wave pattern. The program is limited to two longitudinal wave
    cuts at present.

    * Bottom pressure signature calculations uncrippled but still need
    validation and checking.

    Have fun!
    Leo.
     
  2. member 10795
    Joined: Sep 2005
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    Location: milky way

    member 10795 Sensei

    As of 8.04, Michlet had four variants: Demo, Basic, Pro, and ProSig - since I didn't see any reference to them on the website, have all but one been dropped?
     
  3. Leo Lazauskas
    Joined: Jan 2002
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    Location: Adelaide, South Australia

    Leo Lazauskas Senior Member

    Yes, there is just one version now. I gave up maintaining different versions and made it free. My life immediately became simpler.

    Leo.
     
  4. yipster
    Joined: Oct 2002
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    Location: netherlands

    yipster designer

    SUPERCOOL
     
  5. jam007
    Joined: Sep 2005
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    Location: Sweden

    jam007 Junior Member

    What a program!!

    The "Mostly minor modifications ... for better communication with ... FREE!Ship" sounds great for one that just has spent hours editing offset exports from FREE!Ship and turning them into Michlet input.
    I would love to know more about the FREE!Ship - Michlet communication plans.

    Anders M
     
  6. CGN
    Joined: Jan 2003
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    Location: MX

    CGN Senior Member

    You can model you hull in Freeship and export to michlet from Freeship, Freeship will create the in.mtl file so Michlet reads directly from it.

    cheers
     
  7. Leo Lazauskas
    Joined: Jan 2002
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    Location: Adelaide, South Australia

    Leo Lazauskas Senior Member

    It's a game of ping-pong at the moment. Martijn has coded up an export function that (as CGN mentioned in another post) creates an in.mlt file that Michlet can use. Once that version of Free!Ship is released I'll have a look at what more I can do to make the interaction easier. For example, I'm still trying to figure out how to build in a "design draft" parameter suggested many years ago by Tom Speer. The concept itself is not difficult, but it makes the optimisation routines a bit of a pain to program.

    Also, the in.mlt file created by Free!Ship doesn't yet support GODZILLA. The first part of a GODZILLA file is just the standard in.mlt file but I still need to work out how to add the tail end part of the file, or at least make it easy for users themselves to include the optimisation section of the file.

    Regards,
    Leo.
     

  8. jam007
    Joined: Sep 2005
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    Location: Sweden

    jam007 Junior Member

    Thanks!

    Anders M
     
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