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Scaling of wetted-transom resistance for improved full-scale ship performance predictions
RISE Research Institutes of Sweden, Safety and Transport, Maritime department. Chalmers University of Technology, Sweden. (SSPA)ORCID iD: 0000-0001-7136-7932
RISE Research Institutes of Sweden, Safety and Transport, Maritime department. (SSPA)ORCID iD: 0000-0002-6266-2320
Chalmers University of Technology, Sweden.
2022 (English)In: Ocean Engineering, ISSN 0029-8018, E-ISSN 1873-5258, Vol. 266, article id 112590Article in journal (Refereed) Published
Abstract [en]

Determining a ship's propulsive power is a critical stage in the design phase in which the evaluation of the stern plays a crucial role. Different flow regimes can be observed depending on the position and shape of the transom. This paper investigates the wetted-transom flow characteristics and their implications on the 1978 ITTC Performance Prediction Method. In the case of flow separation, such as the wetted-transom flow, the current ITTC-78 procedure does not provide an alternative method. Therefore, two alternative methods were proposed based on the investigations of CFD computations on seven hull forms. The firstly proposed method is a combined EFD&CFD method called the two form factor method. It requires CFD computations in model and full-scale, and it can handle any case of flow separation, including the wetted-transom flow. The second proposed method is an empirical correction formula for the hulls with a wetted-transom flow. Finally, the full-scale speed-power relations between the speed trials and the full-scale predictions from the two alternative methods and the standard ITTC-78 method were presented. It is observed that the two suggested methods considerably improve the correlation between the predictions and the speed trials. © 2022 The Author(s)

Place, publisher, year, edition, pages
Elsevier Ltd , 2022. Vol. 266, article id 112590
Keywords [en]
CFD, Combined CFD/EFD methods, Form factor, Ship resistance, Transom flow, Wetted-transom
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:ri:diva-60426DOI: 10.1016/j.oceaneng.2022.112590Scopus ID: 2-s2.0-85139019055OAI: oai:DiVA.org:ri-60426DiVA, id: diva2:1704817
Note

Funding details: Energimyndigheten, 2020-018759; Funding text 1: This research was funded by Energimyndigheten, the Swedish Energy Agency , grant 2020-018759 , and the computational resources provided by SSPA Sweden AB. The authors declare no conflict of interest. The funders had no role in the design of the study; in the collection, analyses, or interpretation of data; in the writing of the manuscript, or in the decision to publish the results.

Available from: 2022-10-19 Created: 2022-10-19 Last updated: 2024-02-15Bibliographically approved

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Korkmaz, Kadir BurakWerner, Sofia

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