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5 - Model-Ship Correlation

Published online by Cambridge University Press:  07 September 2011

Anthony F. Molland ,
Stephen R. Turnock  and
Dominic A. Hudson
Anthony F. Molland
Affiliation:
University of Southampton
Stephen R. Turnock
Affiliation:
University of Southampton
Dominic A. Hudson
Affiliation:
University of Southampton
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Summary

Purpose

When making conventional power predictions, no account is usually taken of scale effects on:

  1. Hull form effect,

  2. Wake and thrust deduction factors,

  3. Scale effect on propeller efficiency,

  4. Uncertainty of scaling laws for appendage drag.

Experience shows that power predictions can be in error and corrections need to be applied to obtain a realistic trials power estimate. Suitable correction (or correlation) factors have been found using voyage analysis techniques applied to trials data. The errors in predictions are most significant with large, slow-speed, high CB vessels.

Model-ship correlation should not be confused with model-ship extrapolation. The extrapolation process entails extrapolating the model results to full scale to create the ship power prediction. The correlation process compares the full-scale ship power prediction with measured or expected full-scale ship results.

Type
Chapter
Information
Ship Resistance and Propulsion
Practical Estimation of Propulsive Power
 , pp. 85 - 96
Publisher: Cambridge University Press
Print publication year: 2011

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References

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ITTC Recommended Procedure 2005
ITTCReport of Specialist Committee on Speed and Powering Trials23rd International Towing Tank ConferenceVenice 2002Google Scholar
Lackenby, H.Note on the effect of shallow water on ship resistance, BSRAReport 377 1963Google Scholar

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