Validation of the CFD approach for modelling roughness effect on ship resistance

Research output: Contribution to conferencePaper

Abstract

Recently, there have been active efforts to investigate the effect of hull roughness on ship resistance using Computational Fluid Dynamics (CFD). Although, several studies demonstrated that the roughness modelling in the CFD simulations can precisely predict the increase in frictional resistance due to the surface roughness, the experimental validations have been made only for flat plates which have zero pressure gradient. This means that the validations cannot necessarily guarantee the validity of this method for other ship resistance components besides the frictional resistance. Therefore, it is worth to demonstrate the validity of the roughness modelling in CFD on the total resistance of a 3D hull. In this study, CFD models of a towed flat plate and a KRISO Container Ship (KCS) model were developed. In order to simulate the roughness effect in the turbulent boundary layer, a previously determined roughness function of a sand-grain surface was employed in the wall-function of the CFD model. Then the result of the CFD simulations was compared with the experimental data. The result showed a good agreement suggesting that the CFD approach can precisely predict the roughness effect on the total resistance of the 3D hull. Finally, the roughness effects on the individual ship resistance components were investigated.

Conference

Conference6th International Conference on Advanced Model Measurement Technology for The Maritime Industry
CountryItaly
CityRome
Period9/10/1911/10/19

Fingerprint

Drag
Computational fluid dynamics
Surface roughness
Dynamic models
Ship models
Wall function
Computer simulation
Pressure gradient
Containers
Boundary layers
Sand

Keywords

  • computational fluid dynamic (CFD)
  • roughness effect
  • ship resistance
  • towing test

Cite this

Song, S., Demirel, Y. K., Atlar, M., Dai, S., Day, S., & Turan, O. (2019). Validation of the CFD approach for modelling roughness effect on ship resistance. Paper presented at 6th International Conference on Advanced Model Measurement Technology for The Maritime Industry, Rome, Italy.
Song, Soonseok ; Demirel, Yigit Kemal ; Atlar, Mehmet ; Dai, Saishuai ; Day, Sandy ; Turan, Osman. / Validation of the CFD approach for modelling roughness effect on ship resistance. Paper presented at 6th International Conference on Advanced Model Measurement Technology for The Maritime Industry, Rome, Italy.24 p.
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abstract = "Recently, there have been active efforts to investigate the effect of hull roughness on ship resistance using Computational Fluid Dynamics (CFD). Although, several studies demonstrated that the roughness modelling in the CFD simulations can precisely predict the increase in frictional resistance due to the surface roughness, the experimental validations have been made only for flat plates which have zero pressure gradient. This means that the validations cannot necessarily guarantee the validity of this method for other ship resistance components besides the frictional resistance. Therefore, it is worth to demonstrate the validity of the roughness modelling in CFD on the total resistance of a 3D hull. In this study, CFD models of a towed flat plate and a KRISO Container Ship (KCS) model were developed. In order to simulate the roughness effect in the turbulent boundary layer, a previously determined roughness function of a sand-grain surface was employed in the wall-function of the CFD model. Then the result of the CFD simulations was compared with the experimental data. The result showed a good agreement suggesting that the CFD approach can precisely predict the roughness effect on the total resistance of the 3D hull. Finally, the roughness effects on the individual ship resistance components were investigated.",
keywords = "computational fluid dynamic (CFD), roughness effect, ship resistance, towing test",
author = "Soonseok Song and Demirel, {Yigit Kemal} and Mehmet Atlar and Saishuai Dai and Sandy Day and Osman Turan",
year = "2019",
month = "10",
day = "9",
language = "English",
note = "6th International Conference on Advanced Model Measurement Technology for The Maritime Industry : AMT'19 ; Conference date: 09-10-2019 Through 11-10-2019",

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Song, S, Demirel, YK, Atlar, M, Dai, S, Day, S & Turan, O 2019, 'Validation of the CFD approach for modelling roughness effect on ship resistance' Paper presented at 6th International Conference on Advanced Model Measurement Technology for The Maritime Industry, Rome, Italy, 9/10/19 - 11/10/19, .

Validation of the CFD approach for modelling roughness effect on ship resistance. / Song, Soonseok; Demirel, Yigit Kemal; Atlar, Mehmet; Dai, Saishuai; Day, Sandy; Turan, Osman.

2019. Paper presented at 6th International Conference on Advanced Model Measurement Technology for The Maritime Industry, Rome, Italy.

Research output: Contribution to conferencePaper

TY - CONF

T1 - Validation of the CFD approach for modelling roughness effect on ship resistance

AU - Song, Soonseok

AU - Demirel, Yigit Kemal

AU - Atlar, Mehmet

AU - Dai, Saishuai

AU - Day, Sandy

AU - Turan, Osman

PY - 2019/10/9

Y1 - 2019/10/9

N2 - Recently, there have been active efforts to investigate the effect of hull roughness on ship resistance using Computational Fluid Dynamics (CFD). Although, several studies demonstrated that the roughness modelling in the CFD simulations can precisely predict the increase in frictional resistance due to the surface roughness, the experimental validations have been made only for flat plates which have zero pressure gradient. This means that the validations cannot necessarily guarantee the validity of this method for other ship resistance components besides the frictional resistance. Therefore, it is worth to demonstrate the validity of the roughness modelling in CFD on the total resistance of a 3D hull. In this study, CFD models of a towed flat plate and a KRISO Container Ship (KCS) model were developed. In order to simulate the roughness effect in the turbulent boundary layer, a previously determined roughness function of a sand-grain surface was employed in the wall-function of the CFD model. Then the result of the CFD simulations was compared with the experimental data. The result showed a good agreement suggesting that the CFD approach can precisely predict the roughness effect on the total resistance of the 3D hull. Finally, the roughness effects on the individual ship resistance components were investigated.

AB - Recently, there have been active efforts to investigate the effect of hull roughness on ship resistance using Computational Fluid Dynamics (CFD). Although, several studies demonstrated that the roughness modelling in the CFD simulations can precisely predict the increase in frictional resistance due to the surface roughness, the experimental validations have been made only for flat plates which have zero pressure gradient. This means that the validations cannot necessarily guarantee the validity of this method for other ship resistance components besides the frictional resistance. Therefore, it is worth to demonstrate the validity of the roughness modelling in CFD on the total resistance of a 3D hull. In this study, CFD models of a towed flat plate and a KRISO Container Ship (KCS) model were developed. In order to simulate the roughness effect in the turbulent boundary layer, a previously determined roughness function of a sand-grain surface was employed in the wall-function of the CFD model. Then the result of the CFD simulations was compared with the experimental data. The result showed a good agreement suggesting that the CFD approach can precisely predict the roughness effect on the total resistance of the 3D hull. Finally, the roughness effects on the individual ship resistance components were investigated.

KW - computational fluid dynamic (CFD)

KW - roughness effect

KW - ship resistance

KW - towing test

M3 - Paper

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Song S, Demirel YK, Atlar M, Dai S, Day S, Turan O. Validation of the CFD approach for modelling roughness effect on ship resistance. 2019. Paper presented at 6th International Conference on Advanced Model Measurement Technology for The Maritime Industry, Rome, Italy.