CFD based form factor determination method

The 1978 ITTC Power Prediction method is used to predict the propulsive power of ships through towing tank testing. The form factor approach and its determination in this method have been questioned. This paper investigates the possibility to improve the power predictions by introducing Combined CFD...

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Veröffentlicht in:Ocean engineering Jg. 220; S. 108451
Hauptverfasser: Korkmaz, Kadir Burak, Werner, Sofia, Sakamoto, Nobuaki, Queutey, Patrick, Deng, Ganbo, Yuling, Gao, Guoxiang, Dong, Maki, Kevin, Ye, Haixuan, Akinturk, Ayhan, Sayeed, Tanvir, Hino, Takanori, Zhao, Feng, Tezdogan, Tahsin, Demirel, Yigit Kemal, Bensow, Rickard
Format: Journal Article
Sprache:Englisch
Veröffentlicht: Elsevier Ltd 15.01.2021
Elsevier
Schlagworte:
Approximation theory
Ballast (railroad track)
CFD
Combined CFD/EFD Methods
computational fluid dynamics
Computer Science
Design loadings
Determination methods
Distributed, Parallel, and Cluster Computing
Engineering Sciences
Experimental determination
Experimental uncertainty
Experimental uncertainty analysis
Fluid mechanics
Fluids mechanics
Forecasting
Form factor
Form factors
hull
Mathematics
Mechanics
Numerical Analysis
Physics
Power predictions
scale effect
Scale effects
ship design
Ship model tanks
Ship resistance
Ship testing
Structural mechanics
Tanks (containers)
Towing tank test
Uncertainty analysis
Viscous resistance
CFD
Experimental uncertainty analysis
Scale effects
Ship resistance
Combined CFD/EFD Methods
Form factor
ISSN:0029-8018, 1873-5258, 1873-5258
Online-Zugang:Volltext
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Zusammenfassung:The 1978 ITTC Power Prediction method is used to predict the propulsive power of ships through towing tank testing. The form factor approach and its determination in this method have been questioned. This paper investigates the possibility to improve the power predictions by introducing Combined CFD/EFD Method where the experimental determination of form factor is replaced by double body RANS computations applied for open cases KVLCC2 and KCS, including first-time published towing tank tests of KVLCC2 at ballast condition including an experimental uncertainty analysis specifically derived for the form factor. Computations from nine organisations and seven CFD codes are compared to the experiments. The form factor predictions for both hulls in design loading condition compared well with the experimental results in general. For the KVLCC2 ballast condition, majority of the form factors were under-predicted while staying within the experimental uncertainty. Speed dependency is observed with the application of ITTC57 line but it is reduced with the Katsui line and nearly eliminated by numerical friction lines. Comparison of the full-scale viscous resistance predictions obtained by the extrapolations from model scale and direct full-scale computations show that the Combined CFD/EFD Method show significantly less scatter and may thus be a preferred approach. •The experimental uncertainty when determining the form factor is significantly amplified by the Prohaska method.•Towing tank test of KVLCC2 in ballast condition is presented with an uncertainty analysis.•Predictions of wide range of CFD codes and methods compared well with the experiments.•Friction lines are the main cause of the speed dependency of the form factors.•The scatter among the full scale computations are higher than the extrapolations.
ISSN:0029-8018
1873-5258
1873-5258
DOI:10.1016/j.oceaneng.2020.108451