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Analysis of the wave system of a catamaran for CFD validation

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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.

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Abbreviations

B :

beam of each hull

B T :

total bias (%)

C F :

frictional resistance coefficient

C T :

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

P T :

total precision (%)

R :

resistance (g)

R CAT :

Catamaran resistance (g)

R DH :

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

T m :

tests temperature (°)

U T :

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

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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.

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Authors and Affiliations

  1. Model Basin Research Group (CEHINAV), Naval Architecture Department (ETSIN), Technical University of Madrid (UPM), Arco de la Victoria s/n, 28040, Madrid, Spain

    A. Souto-Iglesias, R. Zamora-Rodríguez, D. Fernández-Gutiérrez & L. Pérez-Rojas

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  1. A. Souto-Iglesias
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  2. R. Zamora-Rodríguez
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  3. D. Fernández-Gutiérrez
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  4. L. Pérez-Rojas
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Correspondence to A. Souto-Iglesias.

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Souto-Iglesias, A., Zamora-Rodríguez, R., Fernández-Gutiérrez, D. et al. Analysis of the wave system of a catamaran for CFD validation. Exp Fluids 42, 321–332 (2007). https://doi.org/10.1007/s00348-006-0244-4

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