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Experiments in Fluids

, Volume 42, Issue 2, pp 321–332 | Cite as

Analysis of the wave system of a catamaran for CFD validation

  • A. Souto-IglesiasEmail author
  • R. Zamora-Rodríguez
  • D. Fernández-Gutiérrez
  • L. Pérez-Rojas
Research Article

Abstract

This paper describes the investigations carried out in the towing tank of ETSIN (UPM), where the influence of the distance between catamaran hulls on interference resistance was studied. Resistance, trim and wave cuts were measured for several situations and a device for measuring the wave cuts in different positions between the hulls was built. In order to ascertain the accuracy of the measurements taken, an uncertainty analysis is included. The relation between the interference resistance and the inner wave cuts shapes is analyzed. This analysis provides some insight into the phenomenon but further work is yet to be done.

Keywords

Hull Wave Height Froude Number Wave System Wave Elevation 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

List of symbols

B

beam of each hull

BT

total bias (%)

CF

frictional resistance coefficient

CT

total resistance coefficient

CAT

Catamaran

CFD

computational fluid dynamics

Fn

Froude number

IF

interference factor

L

length between perpendiculars (m)

K

coverage factor

MH

Monohull

PT

total precision (%)

R

resistance (g)

RCAT

Catamaran resistance (g)

RDH

Demihull resistance (g)

S

wetted surface

Sep. 22

220 mm hulls’ separation distance

Sep. 42

420 mm hulls’ separation distance

Sep. 62

620 mm hulls’ separation distance

Tm

tests temperature (°)

UT

total uncertainty (%)

V

velocity (m s−1)

z

measured wave height (m)

(1 + k)

form factor

ρ

density (kg m−3)

\({\varsigma_{W}}\)

dimensionless wave elevation

Notes

Acknowledgments

This work has been partially funded by the program “Plan Nacional I+D+i 2004–2007” of the Spanish “Ministerio de Educación y Ciencia” through the project “Optimización de carenas de yates de alta competición mediante el estudio numérico experimental de apéndices con superficie libre” (file number TRA2005-08866-C02-01/TMAR) headed by the Naval Architecture Department (ETSIN) of the Technical University of Madrid (UPM). The authors are particularly grateful to Graham Cairns and Hugo Gee for correcting and improving the English text.

References

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • A. Souto-Iglesias
    • 1
    Email author
  • R. Zamora-Rodríguez
    • 1
  • D. Fernández-Gutiérrez
    • 1
  • L. Pérez-Rojas
    • 1
  1. 1.Model Basin Research Group (CEHINAV), Naval Architecture Department (ETSIN)Technical University of Madrid (UPM)MadridSpain

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