Added Resistance in Waves

Discussion in 'Hydrodynamics and Aerodynamics' started by quequen, Jan 30, 2014.

  1. quequen
    Joined: Jul 2009
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    Location: argentina

    quequen Senior Member

    Attached Files:

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  2. JotM
    Joined: Jan 2009
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    Location: Leiden, the Netherlands

    JotM Junior Member

    When you would register through http://dsyhs.tudelft.nl/dsyhs.php you would also gain access to a "library" section.
    In this library section the research group at TU Delft states that it will make all papers published on the Delft Systematic Yacht Hull Series since 1974 available on this website at some point in time.
    At the moment you will already be able to download “An Approximation Method for the Added Resistance in Waves of a Sailing Yacht” (MDY06 Madrid march 2006) by Keuning, Vermeulen & Ten Have, plus an Excel file with all the parameter values. No OCR involved here. :)
     
  3. quequen
    Joined: Jul 2009
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    Location: argentina

    quequen Senior Member

    JotM, if you have the files (both the .pdf and excell) and they are in the public domain, could you please upload them here? Thanks!
     
  4. JotM
    Joined: Jan 2009
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    Location: Leiden, the Netherlands

    JotM Junior Member

    RAW data and a description of the possibilities of the online DSYHS database

    I have the files available, so I checked the conditions under which they may be shared.
    The fact that it would become available was previously announced, both through the applicable Dutch channels and on the Chesapeake Sailing Yacht Symposium website:
    From the DSYHS-website:
    So here you are, together with the latest iteration of the DSYHS-based residual resistance formula as presented at Innovsail'08, conveyed directly from the DSYHS-website of the Delft University of Technology.

    2006 - MDY - Added Resistance in Waves
    (Keuning, JA (2006). An Approximation Method for the Added Resistance in Waves of a Sailing Yacht.)
    2006 - MDY - Added Resistance in Waves - CoefficientsRAW
    2008 - Innovsail08 - Bare Hull Resistance DSYHS
    (Keuning, JA & Katgert, M (2008). A bare hull resistance prediction method derived from the results of the delft systematic yacht hull series extended to higher speeds.)
    DSHYS database manual
    (Katgert M & Ouden J den (2013) Manual DSYHS.tudelft.nl - A User Manual for the Delft Systematic Yacht Hull Series Database website)
     

    Attached Files:

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  5. quequen
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    Location: argentina

    quequen Senior Member

    Many thanks JotM!
    -
     
  6. JotM
    Joined: Jan 2009
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    Location: Leiden, the Netherlands

    JotM Junior Member

    You're welcome, but I am only the messenger.
    Keuning, Katger and the grant they obtained from the Dutch ministry of economic affairs, agriculture and innovation made it possible. :)
     
  7. Pablo Sopelana
    Joined: Mar 2021
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    Location: Helsinki

    Pablo Sopelana Junior Member

    It seems I am posting in this thread 12 years later the last answer. Still, as I am starting to add to the software the calculation of the added resistance of sailing yachts, and I wondered whether there are more recent works in this area following the paper published by Keuning, Vermeulen, ten Haven, in 2006.

    Any idea?

    Thanks!
     
  8. JotM
    Joined: Jan 2009
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    Location: Leiden, the Netherlands

    JotM Junior Member

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  9. Pablo Sopelana
    Joined: Mar 2021
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    Location: Helsinki

    Pablo Sopelana Junior Member

    Many thanks, JotM!
    It is refreshing to see how even after 7 years, you are still taking care of this thread.
    I will look at Chalmers directory, and I will post here if I found something interesting.
    As said, I am working now on a calculation template for added resistance of sailing yachts. I have started modeling the sailing yacht transfer functions (response amplitude operator), and I will soon be modeling the sea state through the energy spectral density. I will make the template available at Navalapp's website at:
    https://navalapp.com/calculations/all/
     
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  10. Pablo Sopelana
    Joined: Mar 2021
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    Location: Helsinki

    Pablo Sopelana Junior Member

    By the way, going through the excel file "2006 - MDY - Added Resistance in Waves", I came across the following:

    => Coefficients for kyy = 0.25L, Fn = 0.25, a = 120 are exactly the same to that of Coefficients for kyy = 0.25L, Fn = 0.25, a = 180 (same kyy and Fn but different angle).

    This must be an error: while those coeffs for a = 180 seems to be correct, those of a = 120 are most probably wrong.

    Had anybody spot this point before? Are the correct coeffs for a = 120 available somewhere?

    Thanks again!

    PS. I have also sent a message to DSYHS Database administrators about this
     
  11. Pablo Sopelana
    Joined: Mar 2021
    Posts: 18
    Likes: 4, Points: 3
    Location: Helsinki

    Pablo Sopelana Junior Member

  12. Pablo Sopelana
    Joined: Mar 2021
    Posts: 18
    Likes: 4, Points: 3
    Location: Helsinki

    Pablo Sopelana Junior Member

    I wanted to post an update regarding the error in the RAO coefficients provided in the excel file (2006 - MDY - Added Resistance in Waves - CoefficientsRAW.xls) that can be obtained from the online DSYHS Database (DSYHS Database http://dsyhs.tudelft.nl/dsyhs.php).

    As mentioned above, I contacted the DSYHS Database administrator and I have received the following answer: "unfortunately the men who made the polynomials and coefficients do not work at the university anymore. I will do my very best to find them and to ask whether they have the original list of coefficients for me."

    Waiting for more information to come, has anybody used these coefficients to carry out calculations in the past or may have the original ones or access to them?

    Thank you!
     
  13. Pablo Sopelana
    Joined: Mar 2021
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    Location: Helsinki

    Pablo Sopelana Junior Member

    I just wanted to post some updates.

    Besides the error where the coefficients kyy = 0.25L, Fn = 0.25, a = 120 are exactly the same to that for kyy = 0.25L, Fn = 0.25, a = 180, there is yet a second error: coefficients for kyy = 0.25 L, Fn = 0.30, a = 100 are equal to coefficients for kyy = 0.25 L, Fn = 0.35, a = 100.

    I have made some visual analysis of the results, and what I found is that:
    - Coefficients kyy = 0.25 L, Fn = 0.25, a = 180 and coefficients kyy = 0.25 L, Fn = 0.30, a = 100 seems to be right, while
    - Coefficients kyy = 0.25 L, Fn = 0.25, a = 120 and coefficients kyy = 0.25 L, Fn = 0.35, a = 100 are definitely wrong

    I attach a pdf document with the results that show what I was pointing above.

    I have also received another email from tudfelft. They found the person that worked on the paper (they didn’t mention the name) but unfortunately, this person sent back a file with the coefficients which contains the same errors. They also confirmed that the code that was used for calculating the coeffs is not available anymore but they will still try to find the correct coefficients.

    While waiting for the right coefficients to be found, what I am planning to do is to make:
    - the results for kyy = 0.25 L, Fn = 0.25, a = 120 a function of those for a = 100 and a = 140, and
    - the results for kyy = 0.25 L, Fn = 0.35, a = 100 a function of those for Fn = 0.30 and Fn = 0.40
     

    Attached Files:

  14. Pablo Sopelana
    Joined: Mar 2021
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    Location: Helsinki

    Pablo Sopelana Junior Member

    The calculation template for Added Resistance in Waves (RAW) of a sailing yacht is now available.

    The calculation requires Lwl, Tc, Bwl, Vc, Cp, the yacht's radius of gyration (Kyy), as well as the significant wave height (H1/3) and the modal period of the sea spectrum (To). The sea state is modeled by either the Bretschneider (open sea) or JONSWAP (limited fetch) spectra, considering the yacht is sailing in deep water. A custom value of the water density (default is 1026 kg/m3) can also be provided.

    The results are calculated for all combinations of:
    - Froude numbers 0.20, 0.25, 0.30, 0.35, 0.40 and 0.45
    - Angle of wave incidence 100, 120, 140, 160, and 180 degrees
    - Radii of gyration 0.20, 0.25, 0.30 times Lwl, and the specific radius of gyration provided
    - Wavelength/ship length ratio starting at 0.5, 0.6 …….till 4.0

    The calculation template link is: Added resistance in waves knowing yacht’s radius of gyration (calculation) https://navalapp.com/articles/added-resistance-in-waves-knowing-yacht-radius-of-gyration-calculation/

    And this is the link to a video that shows how the Added Resistance in Waves template is used:
     
    Last edited: May 14, 2021
    Mikko Brummer and Dejay like this.

  15. Mikko Brummer
    Joined: May 2006
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    Location: Finland

    Mikko Brummer Senior Member

    Very nice Pablo, thank you. It's been a while since I looked at your work, beautiful website, so nicely implemented, can't wait till you get the Beta version of the complete app running.
     
    Pablo Sopelana likes this.
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