Published October 3, 2018 | Version v1
Conference paper Open

Assessment of wind heeling lever determined through CFD against the current naval stability standards

Creators

  • 1. QinetiQ, Gosport, UK

Description

Naval stability standards consider the impact of a number of different external factors, one of which is the effect of heeling caused by wind. With relatively large superstructures the wind heeling moment can be relatively significant but despite its potential impact, at present the calculation to determine the wind heeling moment is relatively simplistic.  
 
With increasing fidelity within computational tools, in particular Computational Fluid Dynamics (CFD), it questions whether the current standards are still considered fit for purpose or whether a more time consuming but comprehensive analysis should be used. 
 
This paper discusses work conducted by QinetiQ on behalf of the UK MoD, to explore this area. The work firstly benchmarks wind heeling moment derived by different CFD methods against existing model wind tunnel test results for a heeled patrol boat. The benchmarking compares the level of accuracy of the numerical tools and explores the impact of changing different parameters within the analysis. 
 
Following the benchmarking at model scale, CFD is used to calculate the wind heeling force on two ships at full scale.  The two selected ships represent very different types of hullform and ship particulars.  The results from the CFD analysis are then compared to the results determined using current naval standard wind heeling criteria. 
 
This paper discusses the different CFD methodology applied, the results from the benchmarking, the comparison between the CFD results and those determined by applying the current naval standard criteria and the implications on the applicability of a CFD analysis rather than the current criteria. 

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References

  • UK Defence Standardization: "Stability Standards for Surface Ships (Cat 1)", Part No: 1 – Conventional Ships, Def Stan 02-900, May 2014.
  • Sarchin T.H. & Goldberg L.L.: "Stability and buoyancy Criteria for U.S. Naval Surface Ships", S.N.A.M.E., 1962.
  • Khee C.H.: "Variation of wind heeling moment with angle of heel of ships", University of New South Wales, Australia, 3229936, October 2010.
  • Edwards C.L.: "Ship Wind Heeling Measurement and Comparison with Numerical Analysis", University of New South Wales, Australia, z3254386, June 2015.
  • Brown P.: "A Study of Small Ship Stability", Department of Defence, Canberra.
  • Kinoshita M. & Okada S.: "Heeling Moments due to the Wind Pressure on Small Vessels", Symp. On the behaviour of ships in a seaway, Wageningen, Netherlands, P.527, 1957.
  • Rawson K.J. & Tupper E.C.: "Basic Ship Theory", Volume 1, Chapters 1 to 9, Hydrostatics and Strength, Longman Scientific & Technical, Fourth edition, 1994.
  • Forrest J.S & Owen I.: "An investigation of ship airwakes using Detached-Eddy Simulation", University of Liverpool, Computers and Fluids 39 656-673, November 2009.
  • Spalart P.R.: "Young-person's guide to detached-Eddy simulation grids", Technical Report, NASA, NASA/CR2001-211032, 2001.
  • Hedges L.S, Travin A.K, Spalart P.R.: "Detached-eddy simulations over a simplified landing gear", J Fluids Eng, Trans ASME 2002;124(2):193-200, 2002.
  • Forsythe J.R, Squires K.D, Wurtzler K.E, Spalart P.R.: "Detached-eddy simulation of the F-15E at high alpha", J Aircraft 2004;41(2):193-200, 2004.