The influence of the hull representation for modelling of primary ship waves with a shallow-water equation solver

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Autoren

  • León Carlos Dempwolff
  • Christian Windt
  • Gregor Melling
  • Tobias Martin
  • Hans Bihs
  • Ingrid Holzwarth
  • Nils Goseberg

Organisationseinheiten

Externe Organisationen

  • Technische Universität Braunschweig
  • Bundesanstalt für Wasserbau (BAW)
  • Norwegian University of Science and Technology (NTNU)
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Details

OriginalspracheEnglisch
Aufsatznummer113163
FachzeitschriftOcean engineering
Jahrgang266
Frühes Online-Datum28 Nov. 2022
PublikationsstatusVeröffentlicht - 15 Dez. 2022

Abstract

Long-period ship-generated loads have become design-relevant in many shallow and confined waterways. Numerical methods based on depth-averaged equations have conceptually proven successful to provide the ship wave parameters required for waterway management and design. Yet, the validation of these models remains challenging, due to variations in hull shapes, transient ship-motion during field data collection, and the dearth of published experimental benchmark data. The present study makes use of a new experimental data set to validate novel ship-modelling options in the shallow water equations solver REEF3D::SFLOW, using its free surface pressure extension for predicting long-period ship-generated load. The model predicts the primary wave field and the maximum return current with sufficiently low errors (MAPE) of 9.09% and 23.48%, respectively. A sensitivity study reveals that a simple slender body pressure assumption yields comparable simulation performance compared to a more complex hull-derived pressure distribution. The cross-sectional area of the respective pressure function, rather than the exact pressure function shape, is found to be decisive for the correct prediction of the design parameters primary wave height and maximum return current. Based on a systematic investigation of the ship draft to water depth relation, concise guidance on the choice of appropriate pressure functions is presented.

ASJC Scopus Sachgebiete

Zitieren

The influence of the hull representation for modelling of primary ship waves with a shallow-water equation solver. / Dempwolff, León Carlos; Windt, Christian; Melling, Gregor et al.
in: Ocean engineering, Jahrgang 266, 113163, 15.12.2022.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Dempwolff, L. C., Windt, C., Melling, G., Martin, T., Bihs, H., Holzwarth, I., & Goseberg, N. (2022). The influence of the hull representation for modelling of primary ship waves with a shallow-water equation solver. Ocean engineering, 266, Artikel 113163. https://doi.org/10.1016/j.oceaneng.2022.113163
Dempwolff LC, Windt C, Melling G, Martin T, Bihs H, Holzwarth I et al. The influence of the hull representation for modelling of primary ship waves with a shallow-water equation solver. Ocean engineering. 2022 Dez 15;266:113163. Epub 2022 Nov 28. doi: 10.1016/j.oceaneng.2022.113163
Dempwolff, León Carlos ; Windt, Christian ; Melling, Gregor et al. / The influence of the hull representation for modelling of primary ship waves with a shallow-water equation solver. in: Ocean engineering. 2022 ; Jahrgang 266.
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abstract = "Long-period ship-generated loads have become design-relevant in many shallow and confined waterways. Numerical methods based on depth-averaged equations have conceptually proven successful to provide the ship wave parameters required for waterway management and design. Yet, the validation of these models remains challenging, due to variations in hull shapes, transient ship-motion during field data collection, and the dearth of published experimental benchmark data. The present study makes use of a new experimental data set to validate novel ship-modelling options in the shallow water equations solver REEF3D::SFLOW, using its free surface pressure extension for predicting long-period ship-generated load. The model predicts the primary wave field and the maximum return current with sufficiently low errors (MAPE) of 9.09% and 23.48%, respectively. A sensitivity study reveals that a simple slender body pressure assumption yields comparable simulation performance compared to a more complex hull-derived pressure distribution. The cross-sectional area of the respective pressure function, rather than the exact pressure function shape, is found to be decisive for the correct prediction of the design parameters primary wave height and maximum return current. Based on a systematic investigation of the ship draft to water depth relation, concise guidance on the choice of appropriate pressure functions is presented.",
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