A three-dimensional SPH model for detailed study of free surface deformation, just behind a rectangular planing hull

Dashtimanesh, Abbas; Ghadimi, Parviz

doi:10.1007/s40430-013-0035-9

Cited by 18 publications

(8 citation statements)

References 18 publications

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“…28 Some of the recent studies have also shown the reasonable accuracy of the smoothed particle hydrodynamics (SPH), especially in predicting the free-surface elevation around the planing hulls. [29][30][31] On the other hand, Zeraatgar et al 32 focused on the performance of planing-wing hybrid craft and using vortex lattice method (based on BEM) determined feasibility of utilizing an aerodynamic wing mounted on planing craft. They presented both hydrodynamic and aerodynamic lift to the drag ratios as a function of angle of attack for different speeds.…”

Section: Previous Workmentioning

confidence: 99%

Numerical investigation of hydrodynamic forces acting on the non-stepped and double-stepped planing hulls during yawed steady motion

Ghadimi

Panahi

2018

Proceedings of the Institution of Mechanical Engineers, Part M:

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This article focuses on the steady motion of yawed planing hulls with emphasis on the effects of adding steps to the bottom of these vessels on the hydrodynamic forces and moments acting on the boat. To analyze the problem, the Ansys-CFX software is used and three different planing hulls are investigated in steady yawed condition. The main targeted results include hydrodynamic forces and moments acting on the boat at different yaw angles and beam Froude numbers which provide important insights regarding the effects of loading and adding step on these forces and moments. The numerically predicted sway forces are compared against experimental data, suggesting that the current numerical model predicts sway and surge forces with reasonable accuracy. Moreover, it is observed that surge force coefficient of the investigated prismatic planing hull with light loading condition does not change significantly when the hull is relocated in a yaw angle, while it is remarkably affected when the boat is heavy. Furthermore, it is observed that this prismatic planing hull has smaller rolling moment in a steady yawed motion, when it moves at larger beam Froude number. Meanwhile, the computed yawing moments of this hull indicate that an increase in speed does not change this moment notably, while an increase in its weight yields larger yawing moment. Comparison of the results of stepped and non-stepped planing hulls indicates that surge force coefficient of the stepped hull is larger, while its sway force and rolling moment are smaller. This is mainly caused by the shape of the interrupted wetted surface and larger number of maximum pressure area in the stepped planing hull. Finally, it is concluded that there is no significant difference between the yawing moment of the investigated stepped and non-stepped planing hulls.

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Section: Previous Workmentioning

confidence: 99%

Numerical investigation of hydrodynamic forces acting on the non-stepped and double-stepped planing hulls during yawed steady motion

Ghadimi

Panahi

2018

Proceedings of the Institution of Mechanical Engineers, Part M:

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“…There are some other methods by which the blood flow (containing or without cells) and elastic solid can be simulated. They can be lattice Boltzmann method [18,19] and smoothed particle hydrodynamics (SPH) [20,21]. Modeling and simulation of cardiac assist devices using CFD and FSI have improved the design and performance of the cardiac assist devices.…”

Section: Introductionmentioning

confidence: 99%

Calculating the aortic valve force and generated power by a specific cardiac assist device (AVICENA) in different counterpulsation

Alizadeh

Rahmani

Tehrani

2018

J Braz. Soc. Mech. Sci. Eng.

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AVICENA is a specific cardiac assist device which is used in the cases with left ventricular failure and implanted in the aorta that can pump the blood flow with more strength into the circulatory system. Although this device can increase the power of blood flow by its inflation and deflation, it may apply some extra force to the aortic valve while working in the heart. This study aims at investigating these amounts of generated power and aortic valve force in different patterns of device counterpulsation using FSI. In this study, only six different displacement factor curves applied to the balloon as well as only one boundary condition applied to the inlet and outlet of the aorta are considered. The outcome of this study helps to improve the design of this device in a way that it may produce more power and less force on the aortic valve.

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“…The SPH method was also previously used by the current authors to simulate different hydrodynamic phenomena such as dam break, 31 planing flat plate 32 and transom stern flow problems. 33,34 In this study, the authors have focused on the academic aspects of the considered problem which can of course be very useful for the designers. From the scientific standpoint, effort has been made to offer a suitable SPH model for simulation of slamming phenomenon in catamaran sections which is capable of modeling the details of the generated free surface in addition to the accurate emulation of pressure distribution.…”

Section: Introductionmentioning

confidence: 99%

Effect of flat deck on catamaran water entry through smoothed particle hydrodynamics

Farsi

Ghadimi

2015

Proceedings of the Institution of Mechanical Engineers, Part M:

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This article presents an investigation of water entry of two types of catamarans by smoothed particle hydrodynamics method. Constant velocity is considered for each model. For the first model, J3, water entry simulation of demi hull, wave-piercing hull and whole hull is performed. Pressure distribution and free surfaces of each test are presented. Comparison between pressure distribution of the whole hull and other parts shows a principal difference in flow regime around the bodies. Pressure coefficient of the whole body is larger than other body and has an increasing-decreasing behavior versus time. The second case study includes an INCAT model which is also simulated at a constant velocity. Pressure distribution of the INCAT model is compared against that of J3 model. Because of different geometries of the models, there are differences in their surrounding flow and pressure distributions. Mean pressure distribution and peak pressure of the J3 model are found to be greater than those of the INCAT model. Therefore, one may claim that a rounded corner body lick as INCAT model is perhaps better than a sharp body lick as J3 model.

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A three-dimensional SPH model for detailed study of free surface deformation, just behind a rectangular planing hull

Cited by 18 publications

References 18 publications

Numerical investigation of hydrodynamic forces acting on the non-stepped and double-stepped planing hulls during yawed steady motion

Numerical investigation of hydrodynamic forces acting on the non-stepped and double-stepped planing hulls during yawed steady motion

Calculating the aortic valve force and generated power by a specific cardiac assist device (AVICENA) in different counterpulsation

Effect of flat deck on catamaran water entry through smoothed particle hydrodynamics

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