A CFD study: Influence of biofouling on a full-scale submarine

Uzun, Dogancan; Sezen, Savaş; Ozyurt, Refik; Atlar, Mehmet; Turan, Osman

doi:10.1016/j.apor.2021.102561

Cited by 12 publications

(12 citation statements)

References 50 publications

(76 reference statements)

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“…The numerical uncertainty value can be estimated by the Grid Convergence Index (GCI) method [46] over the relationship between the results of the key parameters obtained from each grid structure. The GCI method is widely used and a conventional method in spatial convergence study as shown in [47][48][49]. It should be noted that the results obtained from each grid structure must converge monotonically for the GCI method to be applied [50].…”

Section: Verification Studymentioning

confidence: 99%

Full-Scale CFD Analysis of Double-M Craft Seakeeping Performance in Regular Head Waves

Öztürk

Mancini

et al. 2021

JMSE

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This study presents the full-scale resistance and seakeeping performance of an awarded Double-M craft designed as a 15 m next-generation Emergency Response and Rescue Vessel (ERRV). For this purpose, the Double-M craft is designed by comprising the benchmark Delft 372 catamaran with an additional center and two side hulls. First, the resistance and seakeeping analyses of Delft 372 catamaran are simulated on the model scale to verify and compare the numerical setup for Fr = 0.7. Second, the seakeeping performance of the full-scale Double-M craft is examined at Fr = 0.7 in regular head waves (λ/L = 1 to 2.5) for added resistance and 2-DOF motion responses. The turbulent flow is simulated by the unsteady RANS method with the Realizable Two-Layer k-ε scheme. The calm water is represented by the flat VOF (Volume of Fluid) wave, while the incident long waves are represented by the fifth-order Stokes wave. The residual resistance of the Double-M craft is improved by 2.45% compared to that of the Delft 372 catamaran. In the case of maximum improvement (at λ/L = 1.50), the relative added resistance of the Double-M craft is 10.34% lower than the Delft 372 catamaran; moreover, the heave and pitch motion responses were 72.5% and 35.5% less, respectively.

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Section: Verification Studymentioning

confidence: 99%

Full-Scale CFD Analysis of Double-M Craft Seakeeping Performance in Regular Head Waves

Öztürk

Mancini

et al. 2021

JMSE

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“…The authors' recent study investigated the influence of uniformly distributed particular biofouling roughness on the full-scale DARPA Suboff form's resistance and nominal wake characteristics in the propeller's absence (Uzun et al, 2021). The results of this study pointed out that the presence of roughness increased the effective power ranging from ~36% to ~112%, whereas the nominal wake fraction values increased in a range from ~25% to ~68% compared to the smooth hull surface condition.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, CFD has been widely used as a high-fidelity approach in predicting the effect of a surface condition on full-scale bodies, i.e. ships (Castro et al, 2011;Demirel et al, 2014;Farkas et al, 2018;Khor and Xiao, 2011;Song et al, 2019;Speranza et al, 2019;Uzun et al, 2021). The advantage of using CFD is that it allows capturing the change in the friction velocity, 𝑈 𝜏 and thus the change in roughness Reynolds number, 𝑘 + over the immersed surface of a body.…”

Section: Introductionmentioning

confidence: 99%

Effect of biofouling roughness on the full-scale powering performance of a submarine

et al. 2021

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“…As far as the stated scope of the investigations is concerned, the accurate determination of forces and moments [27], the influence exerted by the different turbulence closure models [28,29], and the verification and validation of the results [30,31] should be mentioned. Both model-scale [32] and full-scale computations [33] have been performed and some significant progress has been reported so far. Aside of all those mentioned above, the maneuvering performance and signatures of a submarine were of a major interest since they have been found to be significantly influenced by the flow unsteadiness, thus requiring a better numerical treatment.…”

Section: Introductionmentioning

confidence: 99%

Large Flow Separations around a Generic Submarine in Static Drift Motion Resolved by Various Turbulence Closure Models

Lungu

2022

JMSE

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A thorough numerical introspection for assessing the particular issues of large flow separations around a submersible hull by using various turbulence models is described. The generic Defense Advanced Research Projects Agency (DARPA hereafter) Suboff hull is considered in the present study. Detailed descriptions of the mathematics behind the hybrid Shear Stress Transport (SST), Detached Eddy Simulation (DES) and the Improved Delayed Detached Eddy Simulation (IDDES) are given. The ISIS solver of the FineTM/Marine package is used to solve the flow problems. An adaptive mesh refinement is employed for resolving the flow inside the areas hosting significant flow gradients. Two sets of computations are analyzed: one refers to the straight-ahead course, whereas the other is focused on the static drift motions. Four angles of incident flow and three different incoming flow velocities are proposed for clarifying the details of the flow separation. Extensive grid convergence tests are performed for both working regimes and for all the meshes used in the present investigation. Extended verification and validation (V&V hereafter) of the numerical approach is performed through extensive comparisons with the experimental data. Global hydrodynamic performance of the hull as well as the local flow features are discussed in detail. The study is concluded by a series of final remarks aimed at providing useful information for further similar investigations.

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A CFD study: Influence of biofouling on a full-scale submarine

Cited by 12 publications

References 50 publications

Full-Scale CFD Analysis of Double-M Craft Seakeeping Performance in Regular Head Waves

Full-Scale CFD Analysis of Double-M Craft Seakeeping Performance in Regular Head Waves

Effect of biofouling roughness on the full-scale powering performance of a submarine

Large Flow Separations around a Generic Submarine in Static Drift Motion Resolved by Various Turbulence Closure Models

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