Numerical prediction of total resistance using full similarity technique

Savas Sezen, Ferdi Cakici

Research output: Contribution to journalArticle

Abstract

Model tests are often conducted by researchers in a real or a numerical towing tank to calculate residuary resistance of a ship by the aid of Froude similarity. Common ITTC-1957 formula is usually employed to calculate frictional resistance. As computer technologies develop over time, CFD tools are used for calculating total resistance of a ship at full scale without establishing any dynamic similarities. In this paper, it is numerically implemented both Froude and Reynolds similarities at four different model scales by using virtual fluids. The total resistance at different Fr numbers calculated by the numerical study is validated against the experimental data of DTMB 5512 (L=3.048 m) model hull. The results show that establishing Froude and Reynolds similarities together in numerical simulation is possible in principle. To determine whether it has advantages for prediction of full-scale ship total resistance by employing this method, it is also examined the model scale with the same number of elements and Reynolds number of the full-scale ship. Results show that numerical calculation of total resistance for a full-scale ship in a model scale by defining virtual fluids has only slight advantages on the prediction of residuary resistance. Additionally, no advantage in the calculation of frictional resistance is observed.
Original languageEnglish
JournalChina Ocean Engineering
Publication statusAccepted/In press - 5 Mar 2019

Fingerprint

Ships
prediction
Ship model tanks
towing
Fluids
fluid
hull
Reynolds number
model test
aid
Computational fluid dynamics
ship
Computer simulation
simulation
calculation

Keywords

  • total resistance
  • Froude and Reynolds similarities
  • DTMB 5512
  • CFD

Cite this

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title = "Numerical prediction of total resistance using full similarity technique",
abstract = "Model tests are often conducted by researchers in a real or a numerical towing tank to calculate residuary resistance of a ship by the aid of Froude similarity. Common ITTC-1957 formula is usually employed to calculate frictional resistance. As computer technologies develop over time, CFD tools are used for calculating total resistance of a ship at full scale without establishing any dynamic similarities. In this paper, it is numerically implemented both Froude and Reynolds similarities at four different model scales by using virtual fluids. The total resistance at different Fr numbers calculated by the numerical study is validated against the experimental data of DTMB 5512 (L=3.048 m) model hull. The results show that establishing Froude and Reynolds similarities together in numerical simulation is possible in principle. To determine whether it has advantages for prediction of full-scale ship total resistance by employing this method, it is also examined the model scale with the same number of elements and Reynolds number of the full-scale ship. Results show that numerical calculation of total resistance for a full-scale ship in a model scale by defining virtual fluids has only slight advantages on the prediction of residuary resistance. Additionally, no advantage in the calculation of frictional resistance is observed.",
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Numerical prediction of total resistance using full similarity technique. / Sezen, Savas; Cakici, Ferdi.

In: China Ocean Engineering, 05.03.2019.

Research output: Contribution to journalArticle

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AU - Sezen, Savas

AU - Cakici, Ferdi

PY - 2019/3/5

Y1 - 2019/3/5

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AB - Model tests are often conducted by researchers in a real or a numerical towing tank to calculate residuary resistance of a ship by the aid of Froude similarity. Common ITTC-1957 formula is usually employed to calculate frictional resistance. As computer technologies develop over time, CFD tools are used for calculating total resistance of a ship at full scale without establishing any dynamic similarities. In this paper, it is numerically implemented both Froude and Reynolds similarities at four different model scales by using virtual fluids. The total resistance at different Fr numbers calculated by the numerical study is validated against the experimental data of DTMB 5512 (L=3.048 m) model hull. The results show that establishing Froude and Reynolds similarities together in numerical simulation is possible in principle. To determine whether it has advantages for prediction of full-scale ship total resistance by employing this method, it is also examined the model scale with the same number of elements and Reynolds number of the full-scale ship. Results show that numerical calculation of total resistance for a full-scale ship in a model scale by defining virtual fluids has only slight advantages on the prediction of residuary resistance. Additionally, no advantage in the calculation of frictional resistance is observed.

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