Analysis of propeller bearing loads by CFD. Part I: Straight ahead and steady turning maneuvers

Dubbioso, Giulio; Muscari, Roberto; Ortolani, Fabrizio; Mascio, Andrea Di

doi:10.1016/j.oceaneng.2016.12.004

Cited by 73 publications

(15 citation statements)

References 27 publications

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“…For this reasons, weakly-coupled uRANSE − BEMT simulations in transverse plane should be carried out to achieve a more accurate prediction of these loads; moreover, the real attitude in the transverse plane (roll angle) should be considered in the simulation, because the in-plane loads are sensitive to the wake and load distribution over the propeller disk as described in the following analysis. The interested reader is referred to [27,28] for a deeper discussion on these aspects.…”

Section: Resultsmentioning

confidence: 99%

“…The propeller solver is based on the blade element method. In the present work, the basic solver described in [27,35] was modified to account for scale effects; in this paragraph the basic algorithm is briefly reviewed (the interested reader can refer to [27,35]) and the modified one is discussed in Section 6.…”

Section: Models and Methodologiesmentioning

confidence: 99%

“…The relation between the motion and propeller loads were preliminary assessed by simple momentum theory. The analysis was then broadened by CFD computation and the use of simplified propeller modeling in order to clarify the effects of the wake evolution on propeller loads [27][28][29]. In the present work, a synthesis of the experimental and numerical activity of these works is proposed to recap the key aspects that drive the propeller performance in off-design functioning.…”

Section: Introductionmentioning

confidence: 99%

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Experimental and Numerical Investigation of Propeller Loads in Off-Design Conditions

Ortolani

Dubbioso

Muscari

et al. 2018

JMSE

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The understanding of the performance of a propeller in realistic operative conditions is nowadays a key issue for improving design techniques, guaranteeing safety and continuity of operation at sea, and reducing maintenance costs. In this paper, a summary of the recent research carried out at CNR-INSEAN devoted to the analysis of propeller loads in realistic operative scenarios, with particular emphasis on the in-plane loads, is presented. In particular, the experimental results carried out on a free running maneuvering model equipped with a novel force transducer are discussed and supported by CFD (Computational Fluid Dynamics) analysis and the use of a simplified propeller model, based on Blade Element Momentum Theory, with the aim of achieving a deeper understanding of the mechanisms that govern the functioning of the propeller in off-design. Moreover, the analysis includes the scaling factors that can be used to obtain a prediction from model measurements, the propeller radial force being the primary cause of failures of the shaft bearings. In particular, the analysis highlighted that cavitation at full scale can cause the increment of in-plane loads by about 20% with respect to a non-cavitating case, that that in-plane loads could be more sensitive to cavitation than thrust and torque, and that Reynolds number effect is negligible. For the analysis of cavitation, an alternative version of the BEMT solver, improved with cavitation linear theory, was developed.

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Section: Resultsmentioning

confidence: 99%

Section: Models and Methodologiesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Experimental and Numerical Investigation of Propeller Loads in Off-Design Conditions

Ortolani

Dubbioso

Muscari

et al. 2018

JMSE

Self Cite

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“…The rotation of a propeller is realized by implementing a sliding technique, and the propeller eccentric force could be directly calculated during the simulation. Unlike previous studies with high-speed navy vessels [6,8,9,[11][12][13][14], the target vessel had a relatively low speed and was operated conservatively meaning that, ship motion such as a heeling during the turning was not considered. The rudder angle for each turning direction in the numerical simulation was defined as being the same as the value of official turning circle test.…”

Section: Definition For Maneuvering Conditionmentioning

confidence: 99%

“…They showed the shaft behavior inside the Aft-stern bush bearing in the CRP system. Dubbioso et al [11] investigated the propeller bearing load of a twin-screw frigate vessel in a straight ahead and steady turning motion. They evaluated the wake distributions using a URANS simulation with an overlapping grid approach.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Rudder Existence on Propeller Eccentric Force

Song¹,

Park²,

Lee³

2019

JMSE

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In order to design a safe shafting system in a ship, it is vital to precisely predict load on stern tube bearing. It is well known that load on stern tube bearing is directly influenced by the eccentric force of a propeller. In this paper, the effect of rudder existence on propeller eccentric force was studied based on numerical analysis with a 10,000 TEU class container vessel. To obtain propeller eccentric force, numerical simulations including propeller rotation motion using a sliding mesh technique were carried out. When a ship is turning, propeller eccentric force significantly changes compared to those of straight run. For starboard turning especially, the propeller vertical moment was decreased by about 50% due to the existence of a rudder compared to that without a rudder. In contrast, as for port turning, the results of simulations with and without a rudder were similar to each other. This difference is fundamentally due to the interaction between the direction of propeller rotation and the inflow direction to a propeller. Based on this study, it is inferred that the influence of appendages around a propeller need to be considered to ensure the reliable prediction of propeller eccentric force.

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Manoeuvring and Control

Renilson

2018

Submarine Hydrodynamics

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Analysis of propeller bearing loads by CFD. Part I: Straight ahead and steady turning maneuvers

Cited by 73 publications

References 27 publications

Experimental and Numerical Investigation of Propeller Loads in Off-Design Conditions

Experimental and Numerical Investigation of Propeller Loads in Off-Design Conditions

The Effect of Rudder Existence on Propeller Eccentric Force

Manoeuvring and Control

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