CFD/OpenFoam vs Holtrop Mennen

Discussion in 'Hydrodynamics and Aerodynamics' started by Surfer Naval Architect, Mar 25, 2018.

  1. Surfer Naval Architect
    Joined: Feb 2018
    Posts: 31
    Likes: 1, Points: 8
    Location: Amsterdam, The Netherlands

    Surfer Naval Architect Naval Architect

    Dear All,

    I am busy in this period to validate results of cfd calculations made with the software OpenFoam. Not having the possibility to verify my results with the experiments in the towing test, I thought to bring a vessel which has good parameters to fit perfectly in the regression of Holtrop Mennen. Althought I don't really have an idea of how much this difference between CFD calculations and Holtrop Mennen results should be. So far, I got around 5% of deviation for high speeds (21- 23- 25 knots), but around 9% for lower speed, like 17 knots. I am wondering what the percentage boundary should be beyond which the results are too far from the regression to be credible.

    I am counting on your experience in hydrodynamics as a naval architect and/or maybe you have had similar type of comparison in your carrier.

    Thank you in advance,

    RF
     
  2. DCockey
    Joined: Oct 2009
    Posts: 4,488
    Likes: 236, Points: 63, Legacy Rep: 1485
    Location: Midcoast Maine

    DCockey Senior Member

    What type of hull? Have you used OpenFoam on a similar hull for which experimental results are available?
     
  3. Surfer Naval Architect
    Joined: Feb 2018
    Posts: 31
    Likes: 1, Points: 8
    Location: Amsterdam, The Netherlands

    Surfer Naval Architect Naval Architect

    Dear David,
    thanks a lot for your reply.

    I am using a frigate called GOA downloaded from the SARC website, Downloads - SARC https://www.sarc.nl/downloads/, Fairway_parenthulls . In attachment you can see the lines plan.
    Yes I used OpenFoam for the DTCHull, but the DTCHull doesn't fit in the regression of Holtrop Mennen, that's a problem that I had.
    Do you have some suggestions for me?

    Thanks and regards,

    Raffaele Frontera
     

    Attached Files:

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