Full-scale unsteady RANS CFD simulations of ship behaviour and performance in head seas due to slow steaming

Tezdogan, Tahsin; Demirel, Yiğit Kemal; Kellett, Paula; Khorasanchi, Mahdi; Incecik, Atilla; Turan, Osman

doi:10.1016/j.oceaneng.2015.01.011

Cited by 291 publications

(130 citation statements)

References 32 publications

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“…The increase in the effective power of a ship, P E, due to the effect of fouling can be expressed by: similar to that used by Tezdogan et al (2015) and Demirel et al (2017). ΔC F is the added resistance coefficient due to surface roughness.…”

Section: Experimental Facilities Model Details and Methodsmentioning

confidence: 99%

Effect of barnacle fouling on ship resistance and powering

et al. 2017

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Predictions of added resistance and the effective power of ships were made for varying barnacle fouling conditions. A series of towing tests was carried out using flat plates covered with artificial barnacles. The tests were designed to allow the examination of the effects of barnacle height and percentage coverage on the resistance and effective power of ships. The drag coefficients and roughness function values were evaluated for the flat plates. The roughness effects of the fouling conditions on the ships' frictional resistances were predicted. Added resistance diagrams were then plotted using these predictions, and powering penalties for these ships were calculated using the diagrams generated. The results indicate that the effect of barnacle size is significant, since a 10% coverage of barnacles each 5 mm in height caused a similar level of added power requirements to a 50% coverage of barnacles each 1.25 mm in height.

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Section: Experimental Facilities Model Details and Methodsmentioning

confidence: 99%

Effect of barnacle fouling on ship resistance and powering

et al. 2017

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“…As widely accepted, this kind of simulation can be a useful support to towing tank testing; moreover, a CFD analysis would allow a complete investigation of the flow field details, which can help the physical understanding of the phenomena involved. Indeed, the hydrodynamics of a catamaran presents complex problems, see, for example (Stern et al, 2008;Zlatev et al, 2009;Broglia et al, 2009;Zaghi et al, 2010;Broglia et al, 2011;Tezdogan et al, 2015). Bhushan et al (2009) The CFD simulation performed resistance and powering computations of the full-scale self-propelled Athena ship free to sink and trim use both smooth and rough wall functions.…”

Section: Methodsmentioning

confidence: 99%

An Investigation into the Resistance Components of Converting a Traditional Monohull Fishing Vessel into Catamaran Form

Samuel¹,

Iqbal²,

Utama³

2015

IJTech

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Resistance or drag is one of the most important factors in ship design, in particular in connection with the development of more efficient and environmentally friendly vessels. The shape of the hull under water will affect the fluid flow characteristics around the ship, hence causing the resistance to increase or decrease. If the resistance increases, the size of main engine and subsequently, the fuel consumption increases accordingly and this is not often anticipated by ship designers and operators. The use of a catamaran for passenger carriers is well known and its application for fishing vessels has received serious attention in the last few years, due to its advantages to produce wider deck area and smaller size of engine at the same displacement as the monohulls. The conversion of monohull fishing vessels in Cilacap the waters into a catamaran hull is an interesting topic in association with the development of better fishing vessels in this region. The resistance investigation of the conversion vessel was carried out by Computational Fluid Dynamics (CFD) approach and this is combined with classical slender body theory. In terms of mathematical calculation, the results between CFD and the combination of empirical formulas and slender body theory shows such a good agreement and the difference between the two is less than 5%. In terms of naval architecture, the results showed that the modification of a monohull vessel into a catamaran can increase the payload capacity up to two times. Conversely, this causes the resistance to increase about almost four times and this is certainly unpopular for the fishermen.

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“…It is also cheaper in terms of computer memory compared to the k-SST model which requires higher CPU time [4,23]. The employed solver uses a finite volume method which discretizes the Navier-Stokes (N-S) equations for numerical model of fluid flow.…”

Section: Urans Equations and Modelingmentioning

confidence: 99%

“…The 5 th -order Stokes waves were used to represent the wavy environment for all URANS analyses. This wave profile was selected due to the fact that it is more like a real wave than the one generated by the first order method [4]. …”

Section: Computational Domain and Boundary Conditionsmentioning

confidence: 99%

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Prediction of the Vertical Motions of DTMB 5415 Ship Using Different Numerical Approaches

Çakıcı

Sukas

Kınacı

et al. 2017

brod

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SummaryRecent developments in Computational Fluid Dynamics (CFD) enabled common access for researchers and thus offers solutions to various complex problems in many different fields. With this motivation, in this study, two kinds of numerical methods were employed to investigate the vertical motions in variable regular waves. While the potential method is commonly known as linear "strip theory", the viscous approach is (the state of the art) named as URANS (Unsteady Reynolds Averaged Navier Stokes) solver which has a fully non-linear base. The DTMB 5415 ship model form was selected for a series of computational work. A numerical study was carried out to understand the seakeeping behaviour of the displacement hull for the stationary case Fn=0 and a high speed case Fn=0.41. The RAO (Response Amplitude Operator) graphs for the coupled heave -pitch motions and the ship's vertical accelerations were generated for five encounter frequencies. The numerical results obtained were validated with the existing experimental data and comparisons were made between the two numerical approaches with the help of RAO graphs. The obtained results showed that the limitations of the strip theory pose a handicap as the assumptions involved in the theory narrow down its application. The nonlinear viscous URANS approach tends to be a better option returning closer results to experiments in a wide Froude number range but on the other hand it does not possess the practicality of the strip theory.

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Full-scale unsteady RANS CFD simulations of ship behaviour and performance in head seas due to slow steaming

Cited by 291 publications

References 32 publications

Effect of barnacle fouling on ship resistance and powering

Effect of barnacle fouling on ship resistance and powering

An Investigation into the Resistance Components of Converting a Traditional Monohull Fishing Vessel into Catamaran Form

Prediction of the Vertical Motions of DTMB 5415 Ship Using Different Numerical Approaches

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