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

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


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.



Bilge keel breadth


Ship draft


Velocity increment factor at bilge


Bilge keel length


Distance from roll axis to bilge keel


Transverse velocity component at bilge keel


Relative motion of water in crosswise direction to bilge keel


Bilge keel area


Dimensionless roll damping coefficient


Equivalent roll damping coefficient


Waterline breadth of the ship


Bilge keel damping coefficient, normal drag force part


Coefficient of hull-pressure damping due to bilge keels


Wave damping coefficient


Drag coefficient for bilge keel


Hull-bilge-keel pressure coefficient due to bilge keels


Block coefficient


Waterplane coefficient


Froude number of forward ship speed


Normal drag force of the bilge keel


Local Keulagan-Carpenter-Number for bilge keel


Ship length over all


Waterline length of the ship


Distance to roll axis over undisturbed water surface


Wetted surface area of the ship


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

\(\rho \)


\(\omega \)

Roll frequency

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




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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