Details
| Original language | English |
|---|---|
| Article number | 113163 |
| Journal | Ocean engineering |
| Volume | 266 |
| Early online date | 28 Nov 2022 |
| Publication status | Published - 15 Dec 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.
Keywords
- Bernoulli wake, Depression waves, Shallow and confined waterways, Shallow-water-theory, Ship wake, Ship–waterway interaction
ASJC Scopus subject areas
- Environmental Science(all)
- Environmental Engineering
- Engineering(all)
- Ocean Engineering
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In: Ocean engineering, Vol. 266, 113163, 15.12.2022.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - The influence of the hull representation for modelling of primary ship waves with a shallow-water equation solver
AU - Dempwolff, León Carlos
AU - Windt, Christian
AU - Melling, Gregor
AU - Martin, Tobias
AU - Bihs, Hans
AU - Holzwarth, Ingrid
AU - Goseberg, Nils
PY - 2022/12/15
Y1 - 2022/12/15
N2 - 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.
AB - 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.
KW - Bernoulli wake
KW - Depression waves
KW - Shallow and confined waterways
KW - Shallow-water-theory
KW - Ship wake
KW - Ship–waterway interaction
UR - http://www.scopus.com/inward/record.url?scp=85144852411&partnerID=8YFLogxK
U2 - 10.1016/j.oceaneng.2022.113163
DO - 10.1016/j.oceaneng.2022.113163
M3 - Article
AN - SCOPUS:85144852411
VL - 266
JO - Ocean engineering
JF - Ocean engineering
SN - 0029-8018
M1 - 113163
ER -