Development and assessment of CFD methods to calculate propeller and hull impact on the rudder inflow for a twin-screw ship

Franceschi, Andrea; Piaggio, Benedetto; Villa, Diego; Viviani, Michele

doi:10.1016/j.apor.2022.103227

Cited by 12 publications

(2 citation statements)

References 29 publications

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“…Considering the situations and the merits of CFD which offers opportunities in enhancing EFD based predictions, ITTC sought an alternative of combining both methods for better predictions thru CFD and EFD Combined Methods (3). Researches in the field have revealed the synergy and complementarity of both methods thru various contributions (2,(4)(5)(6)(7)(8)(9)(10)(11). As the stepping stone to establish a reliable CFD method, the EFD/CFD combinations firstly have to possess similar confidence level as the currently implemented method.…”

Section: Introductionmentioning

confidence: 99%

Verification and validation of ITTC benchmark ship CFD performance towards development of CFD and EFD combined methods

Sunarsih

Nanda

Purnamasari³

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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CFD applications in ship hydrodynamics have been remarkably exploited in the past decades. However, the supremacy of experimental tests, known as EFD, are irreplaceable even against the urgency of less laborious and low-cost hydrodynamic prediction methods. Recently, ITTC has introduced and worked out on CFD and EFD combined methods to benefit the best combination of CFD and EFD for the predictions of ship hydrodynamics. This study explores CFD performance towards development of CFD and EFD combined methods by employing ITTC benchmark ships. The ships were modeled and tested in various operating conditions where results were examined against EFD values from previous studies. Accuracy of the simulation results yielded as high as 97.03% indicates that the presented approach is rigor as a basis of CFD and EFD combined methods for sustainable fluid dynamic analysis.

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Section: Introductionmentioning

confidence: 99%

Verification and validation of ITTC benchmark ship CFD performance towards development of CFD and EFD combined methods

Sunarsih

Nanda

Purnamasari³

et al. 2023

IOP Conf. Ser.: Earth Environ. Sci.

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“…Of great importance are also the simulations of the hydrodynamic forces acting on the control surfaces, when a rudder angle is present and when it is combined with different drift angles both in the horizontal and the vertical plane. Starting from the experience developed at the University of Genoa in the last few years (see, for instance, [28][29][30]), towing tank experiments of the DARPA SUBOFF model are simulated using an open-source RANS solver to calculate the hydrodynamic forces and moments and the resultant coefficients.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Numerical Captive Model Tests for Underwater Vehicles: The DARPA SUB-OFF Test Case

Zheku,

Villa,

Piaggio

et al. 2023

JMSE

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During the early design stage of an underwater vehicle, the correct assessment of its manoeuvrability is a crucial task. Conducting experimental tests still has high costs, especially when dealing with small vehicles characterized by low available budget. In the current investigation, virtual towing tank tests are simulated using the open-source OpenFOAM library in order to assess the reliability of CFD methods for the prediction of hydrodynamic forces and moments. A well-known case study, the Defence Advanced Research Projects Agency (DARPA) SUB-OFF model, is used, and the outcomes are compared to the experimental results available in the literature. Five different configurations are investigated for pure drift tests, rudder tests and pure rotation in both vertical and horizontal plane. The results show an overall good agreement with the experimental data with a quite low demanding mesh arrangement of 3M cells, a favourable balance between accuracy and computational time. In more detail, the expected error in the most significant forces during manoeuvres is less than 2% for the fully appended configuration (the submarine real operative condition), whereas the accuracy is moderately reduced for the barehull configuration (a case not representative of a real hull) with an expected error of 15%. A possible reason for the differences observed could be attributed to the description of the two streamwise vortices generated when manoeuvring. Apart from the lateral force and yaw moment, the results of the longitudinal force are also presented, having a greater disparity when compared to the experimental data. Nevertheless, the longitudinal force has no important role for the purpose of making stability and control predictions. The study contributes to the validation and consolidation of CFD methods, offering insights into their accuracy and limitations for practical applications in underwater vehicles.

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Z-Drive Escort Tug manoeuvrability model and simulation, Part II: A full-scale validation

et al. 2022

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Development and assessment of CFD methods to calculate propeller and hull impact on the rudder inflow for a twin-screw ship

Cited by 12 publications

References 29 publications

Verification and validation of ITTC benchmark ship CFD performance towards development of CFD and EFD combined methods

Verification and validation of ITTC benchmark ship CFD performance towards development of CFD and EFD combined methods

Assessment of Numerical Captive Model Tests for Underwater Vehicles: The DARPA SUB-OFF Test Case

Z-Drive Escort Tug manoeuvrability model and simulation, Part II: A full-scale validation

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