Numerical studies on tugboat performance during pushing operations

Zeiad Abdelghafor, Ghalib Taimuri*, Pentti Kujala, Youjiang Wang, Spyros Hirdaris

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

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This paper introduces a RANS CFD methodology for the evaluation of tugboat
dynamics during pushing operations. Two- and three- dimensional methods that respectively utilize “Dynamic Fluid Body Interactions - (DFBI)” and “Tug Force Equilibrium kinematics- (TFE)” are assessed and compared with the aim to better understand the influence of fluid modelling on ship dynamics. For the DFBI method, an unsteady RANS solver comprising of a dynamic fluid body interaction module and a contact mechanics coupling algorithm are used to
predict the forces between a tugboat and an assisted ship. For the TFE method, a steady RANS method is applied and contact actions are calculated as a sum of the hydrodynamic forces on the hull and the propeller. Whereas DFBI accounts for the time variation of the contact forces, the TFE is more rapid and could be used to derive operational decision support criteria. To demonstrate the latter the TFE method is used to derive the pushing forces based on a set of 16
numerical simulations. It is concluded that irrespective of the model used the tugboat speed and orientation may amplify the pushing forces. This effect could be prominent, especially at slow speeds for which the sway force acts in opposite direction to the tug.
Original languageEnglish
Title of host publicationProceedings of the 12th International Workshop on Ship and Marine Hydrodynamics
EditorsSpyros Hirdaris, Decheng Wan
Place of PublicationUK
PublisherInstitute of Physics Publishing
Number of pages14
Publication statusPublished - 9 Aug 2023
MoE publication typeA4 Conference publication
EventInternational Workshop on Ship and Marine Hydrodynamics - Aalto University, Espoo, Finland
Duration: 28 Aug 20231 Sept 2023
Conference number: 12

Publication series

NameIOP Conference Series: Materials Science and Engineering
PublisherInsttute of Physics
ISSN (Electronic)1757-899X


WorkshopInternational Workshop on Ship and Marine Hydrodynamics
Abbreviated titleIWSH


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