Analysis of the wave system of a catamaran for CFD validation

Souto-Iglesias, Antonio; Zamora-Rodríguez, R.; Fernández‐Gutiérrez, David; Pérez-Rojas, Luís

doi:10.1007/s00348-006-0244-4

Cited by 26 publications

(15 citation statements)

References 4 publications

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“…In this case, in fact, the C T curves (Fig. 7a), for all the s values, collapse on the mono-hull line and the separation distance does not have any influence on catamaran resistance, which is consistent with previous studies [6].…”

Section: Interferencesupporting

confidence: 91%

“…However, differently from Souto-Iglesias et al [6] and from Broglia et al [24], in our computations negative IF values are not observed at Fr values near 0.35. As Fr increases, 0.35 \ Fr B 0.45, interference becomes large, owing to the larger differences between mono-hull and catamaran C T values, but with small influence of the separation distance.…”

Section: Interferencecontrasting

confidence: 76%

“…Further experimental and theoretical investigation of the interference phenomena was also carried out in Millward [4] and Molland et al [5]. SoutoIgleasias et al [6] investigated experimentally the influence of the distance between catamaran hulls on wave resistance. They also measured the wave cuts between the two hulls to correlate the shapes of the inner wave cuts with the interference resistance and found the possibility of favorable interference for catamarans.…”

Section: Introductionmentioning

confidence: 99%

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Numerical analysis of the interference effects on resistance, sinkage and trim of a fast catamaran

Castiglione

Kandasamy

et al. 2014

J Mar Sci Technol

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The purpose of the present paper is the numerical investigation of the interference phenomena between the waves generated by the individual hulls of a catamaran. The study focuses on the effects of both Froude number and demi-hull separation distance on resistance and on sinkage and trim. The numerical simulations are carried out by the URANS solver CFDShip-Iowa V.4 and, to assess the capability for prediction of resistance, sinkage and trim of the URANS code for twin-hull configuration vessels, a verification and validation study is performed for global as well as for local variables. A very good agreement between the numerical results and the experimental data is obtained, and the validation study demonstrates the high level of accuracy of the current predictions, which are used to have a better insight into the interference phenomena. In accordance with the experiments, within Fr = 0.45-0.65, the catamaran has a significantly higher resistance coefficient compared to the mono-hull; furthermore, the C T value increases with decreasing the separation distance between the twin hulls. On the contrary, at Fr lower than 0.45 and at Fr higher than 0.65, the effects of hull spacing on resistance as well as on sinkage and trim can be neglected. The flow field characteristics, wave pattern, wave cuts and pressure distributions are analyzed through the CFD analysis. Finally, the effects of the Reynolds number on resistance are also investigated and results show a small decrease in interference with increasing the Reynolds number.

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Section: Interferencesupporting

confidence: 91%

Section: Interferencecontrasting

confidence: 76%

Section: Introductionmentioning

confidence: 99%

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Numerical analysis of the interference effects on resistance, sinkage and trim of a fast catamaran

Castiglione

Kandasamy

et al. 2014

J Mar Sci Technol

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“…However, with further increase of Fr to 1.0, the interference factor was prone to decrease or even be omitted as displayed in Figure 6(d), Figure6(e) and Figure 6(f), as also reported by Molland et al [11]. Similar to what was reported by [29] this occurrence might be due to the favourable factor which resulted in the subsequent reduction of total resistance coefficient. It is convenient to explain here that the existence of the favourable interference factor has led to an attenuation of the viscous and pressure resistances.…”

Section: Effect Of Lateral Separation Ratio (S/l)supporting

confidence: 85%

Computational fluid dynamics investigation on total resistance coefficient of a high-speed “deep-V” catamaran in shallow water

Fitriadhy¹,

Azmi²,

Mansor³

et al. 2017

Int. J. Automot. Mech. Eng.

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A reliable investigation that allows an accurate prediction of the total resistance coefficient of a high-speed" deep-V" catamaran in shallow water is obviously required. The Computational Fluid Dynamic simulation proposed approach is aimed to attain this precise outcome, while a hydrodynamic description of the rationale underlying behind the results is explained. Several effects of lateral separation ratios (S/L) and longitudinal staggered position (R/L) against a wide range of Froude numbers (Fr) from 0.5 to 1.0 were considered. The results revealed that the general increase in Fr is proportional to the increase of total resistance. In contrast, the increase of lateral separation ratios dealt with less total resistance coefficient, where the sufficient reduction of C T was about 11% as the Fr increase from 0.5 to 0.6 for S/L=0.3. Regardless of R/L ratios, the results showed the subsequent increase of Fr from 0.5 to 1.0 was also proportional to the total resistance, where the maximum increase of RT was about 21% as the Fr increase from 0.6 to 0.7. In addition, the increase of R/L ratios has led to sufficient increment of C T by 1.5% as the Fr increase from 0.9 to 1.0. Generally, the increase of S/L and R/L ratios have similar effects on the total resistance characteristics. This CFD simulation results are very useful as preliminary data for the ship resistance, which is mainly required for predicting a ship powering accurately.

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“…The free model condition was then considered, making it more difficult to identify interference effects due to substantially different dynamic trims and sinkages between the mono-hull and the catamaran. 27 Larsson et al 28 simulated the motions of KCS2 and KVLCC2 tanker in head sea condition using RANS equations. Zaghi et al 29 used a computational fluid dynamics (CFD) solver to simulate multi-hulls instead and found a good agreement for the resistance values describing complex interference effects at high Froude number regimes.…”

Section: Introductionmentioning

confidence: 99%

Reynolds-averaged Navier–Stokes simulation of hydrofoil effects on hydrodynamic coefficients of a catamaran in forced oscillation

Najafi

Seif

2016

Proceedings of the Institution of Mechanical Engineers, Part M:

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Determination of high-speed crafts' hydrodynamic coefficients will help to analyze the dynamics of these kinds of vessels and the factors affecting their dynamic stabilities. Also, it can be useful and effective in controlling the vessel instabilities. The main purpose of this study is to determine the coefficients of longitudinal motions of a planing catamaran with and without a hydrofoil using Reynolds-averaged Navier-Stokes method to evaluate the foil effects on them. Determination of hydrodynamic coefficients by experimental approach is costly and requires meticulous laboratory equipment; therefore, utilizing the numerical methods and developing a virtual laboratory seem highly efficient. In this study, the numerical results for hydrodynamic coefficients of a high-speed craft are verified against Troesch's experimental results. In the following, after determination of hydrodynamic coefficients of a planing catamaran with and without foil, the foil effects on its hydrodynamic coefficients are evaluated. The results indicate that most of the coefficients are frequency-independent especially at high frequencies.

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Analysis of the wave system of a catamaran for CFD validation

Cited by 26 publications

References 4 publications

Numerical analysis of the interference effects on resistance, sinkage and trim of a fast catamaran

Numerical analysis of the interference effects on resistance, sinkage and trim of a fast catamaran

Computational fluid dynamics investigation on total resistance coefficient of a high-speed “deep-V” catamaran in shallow water

Reynolds-averaged Navier–Stokes simulation of hydrofoil effects on hydrodynamic coefficients of a catamaran in forced oscillation

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