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Roll Damping of a Twin-Screw Vessel: Comparison of RANSE-CFD with Established Methods

  • Sven Wassermann
  • Nikolai Köllisch
  • Moustafa Abdel-MaksoudEmail author
Chapter
Part of the Fluid Mechanics and Its Applications book series (FMIA, volume 119)

Abstract

A RANSE-CFD method is applied to estimate the roll damping of a modern twin-screw RoPax vessel. The simulations are carried out in full scale and with an undisturbed water surface. The harmonic forced roll motion technique is implemented. The influence of ship speeds, the vertical position of the roll axis and roll amplitudes up to 35\({^\circ }\) are investigated. The interaction between the bilge keels and the ship hull is analyzed. The damping effects of further appendages are discussed. All simulation results are compared with the established method developed by Ikeda and a neural network method based on Blume’s roll damping measurements. The established methods were developed based on studying results of single-screw ships. It can be concluded that both established methods provide acceptable results in certain ranges. For large roll amplitudes, the established methods are out of range and cannot deliver reliable results.

Nomenculture

\(b_{BK}\)

Bilge keel breadth

d

Ship draft

k

Velocity increment factor at bilge

\(l_{BK}\)

Bilge keel length

\(r_{BK}\)

Distance from roll axis to bilge keel

v

Transverse velocity component at bilge keel

x

Relative motion of water in crosswise direction to bilge keel

\(A_{BK}\)

Bilge keel area

\(\hat{B}\)

Dimensionless roll damping coefficient

B

Equivalent roll damping coefficient

\(B_{wl}\)

Waterline breadth of the ship

\(B_{NBK}\)

Bilge keel damping coefficient, normal drag force part

\(B_{SBK}\)

Coefficient of hull-pressure damping due to bilge keels

\(B_{W}\)

Wave damping coefficient

\(C_{D,BK}\)

Drag coefficient for bilge keel

\(C_{P,BK}\)

Hull-bilge-keel pressure coefficient due to bilge keels

\(C_{B}\)

Block coefficient

\(C_{W}\)

Waterplane coefficient

Fr

Froude number of forward ship speed

\(F_{NBK}\)

Normal drag force of the bilge keel

\(KC_{BK}\)

Local Keulagan-Carpenter-Number for bilge keel

\(L_{OA}\)

Ship length over all

\(L_{WL}\)

Waterline length of the ship

RA

Distance to roll axis over undisturbed water surface

S

Wetted surface area of the ship

T

Roll period

\(\alpha \)

Angle between an orthogonal line to the normal force and line of the lever

\(\sigma \)

Section area coefficient

\(\phi \)

Roll angle

\(\phi _H\)

Heel angle amplitude

\(\rho \)

Density

\(\omega \)

Roll frequency

\(\left\{ \right\} _A\)

Amplitude

Notes

Acknowledgements

This project was funded by the German Federal Ministry of Economics and Technology under the aegis of the BMWi-project Best Rolldämpfung within the framework program Schifffahrt und Meerestechnik für das 21. Jahrhundert. The authors would like to thank the project partners: Prof. Dr. B. el Moctar, H. Piehl and R. Kaiser (University Duisburg-Essen), Dr. M. Fröhlich (Potsdam Model Basin) and Dr. V. Shigunov (DNV-GL).

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Copyright information

© Springer Nature Switzerland AG 2019

Authors and Affiliations

  • Sven Wassermann
    • 1
  • Nikolai Köllisch
    • 2
  • Moustafa Abdel-Maksoud
    • 1
    Email author
  1. 1.Institute for Fluid Dynamics and Ship TheoryHamburg University of TechnologyHamburgGermany
  2. 2.Dynamics GroupHamburg University of TechnologyHamburgGermany

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