An Adjoint Numerical / Empirical Approach to Predict the Total Resistance of Ships
Öz
This study aims to propose a
fast calculation method to evaluate the total resistance of a traditional ship
hull form. It became a common knowledge nowadays that the computational fluid
dynamics (CFD) approach is robust in calculating the frictional resistance component
of a ship with double body flow solutions. Modeling of the free surface is
still a problematic issue due to the mathematical background of the Volume of
Fluid (VOF) approach and even if a good match is obtained with experiments,
these multiphase computations consume a lot of time and need higher
computational power. To circumvent this problem, this study proposes a hybrid
CFD-empirical approach. The results of the single phase computations obtained
by CFD is coupled with the empirical approach of Holtrop-Mennen. The frictional
and viscous pressure resistances of a benchmark ship (Duisburg Test Case – DTC)
were calculated by CFD and using the wave resistance values of the
Holtrop-Mennen resistance calculation method, the total resistance was
obtained. To assess double body solutions dominated by viscosity, two different
turbulence models were evaluated in the process. It was found out that k-omega
turbulence model generated slightly better results compared to the k-epsilon according
to the reference experiments.
Anahtar Kelimeler
References
- El Moctar, O., Shigunov, V., Zorn, T., (2012). Duisburg Test Case: Post-Panamax container ship for benchmarking. Ship Technology Research, 59, pp. 50-64.
- Garcia-Gomez, A., (2000). On the form factor scale effect. Ocean Engineering, 27(1), pp. 97-109.
- Holtrop, J. Mennen, G. G., (1982). An approximate power prediction method. International Shipbuilding Progress, 29, pp. 166-170.
- Hughes, G. (1954). Friction and form resistance in turbulent flow and a proposed formulation for use in model and ship correlation. Transactions of RINA, 96.
- International Towing Tank Conference (ITTC), (2011b). 7.5-03-02-03. Practical guidelines for ship CFD applications. In: Proceedings of the 26th ITTC.
- Kinaci, O. K., Kukner, A., Bal, S., (2013). On propeller performance of DTC Post Panamax Container Ship. International Journal of Ocean System Engineering, 3(2), pp. 77-89.
- Molland, A. (ed.), (2008). The maritime engineering reference book – a guide to ship design, construction and operation. Elsevier Ltd.
- Schlichting, H., (1968). Boundary layer theory, Mc-Graw Hill, New York.
Details
Primary Language
Turkish
Subjects
-
Journal Section
Research Article
Publication Date
July 11, 2017
Submission Date
August 1, 2017
Acceptance Date
-
Published in Issue
Year 2017 Number: 208