Assessment of URANS surface effect ship models for calm water and head waves

Bhushan, Shanti; Mousaviraad, Maysam; Stern, Frederick

doi:10.1016/j.apor.2017.07.013

Cited by 7 publications

(8 citation statements)

References 12 publications

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“…In this sense, the hydrodynamics of the SES sidehulls is the same as conventional catamarans. 3D numerical methods such as Rankine source method (Connell et al, 2011), finite element method (Garcí a-Espinosa et al, 2015) and URANS method (Bhushan et al, 2017) have been employed in literature to precisely evaluate the hydrodynamics of SES sidehulls. However, the 3D methods are computationally expensive and might not meet the engineering demands.…”

Section: Introductionmentioning

confidence: 99%

A novel 2.5D method for solving the mixed boundary value problem of a surface effect ship

Guo

Qin

2018

Applied Ocean Research

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When a surface effect ship (SES) sails in waves, the unsteady velocity potential of water can be decomposed into incident potential, sidehull radiation potential, sidehull diffraction potential and radiation potential due to fluctuating air pressure. The potentials related to sidehulls satisfy Neumann boundary conditions (BC) and have been successfully addressed using the 2.5D method. In contrast, the potential related to fluctuating air pressure satisfies mixed BC consisting of homogeneous Neumann BC on the wetted surface of sidehulls and nonhomogeneous Dirichlet BC on the interface between air and water, which has never been studied using the efficient 2.5D method. In this paper, the 2.5D method is firstly proposed to solve the mixed boundary value problem (BVP), which can deal with the coupling between the fluctuating air pressure and sidehulls. By using the 2.5D method, the radiation wave and other relative hydrodynamic parameters of a SES due to the fluctuating air pressure are evaluated. The numerical results on motion response and the fluctuated air pressure of the SES show acceptable agreement with the experimental ones.

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Section: Introductionmentioning

confidence: 99%

A novel 2.5D method for solving the mixed boundary value problem of a surface effect ship

Guo

Qin

2018

Applied Ocean Research

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“…The computational methods, such as Rankine source method [4,5] and RANS method [6,7], may be able to take into account all dynamic effects, but they require considerable amount of computational resources and can take long computational time [3,8].…”

Section: Introductionmentioning

confidence: 99%

A study on hydrodynamics of the air cushion of a high-speed PACSCAT

Guo

Qin

2018

European Journal of Mechanics - B/Fluids

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This paper presents an approximate but efficient method for modeling the hydrodynamics and seakeeping performance of partial air cushion supported catamaran (PACSCAT) with planing demihulls. This method takes into account of the effects of the waves on the air-water interface under the air cushion induced by the pulsating pressure in the cushion and by the demihulls, which are ignored by existing approximate methods. Specifically, the new developments are made in two aspects.One is that the governing equations of the heave and pitch motions of the PACSCAT are derived to include the effects of the waves under the air cushion due to the pulsating pressure and the demihulls.Another one is that an approximate method is developed for evaluating the waves due to the pulsating pressure. Better agreement between the experimental data and the numerical results for pressure is achieved.

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“…Muscari et al [24] investigated hull-propeller-rudder interactions phenomena for twin-screw ships. Other studies using CFD codes are Bhushan et al, Gaggero et al, and Kim et al [25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Free Surface Flow Simulation Around an Appended Ship Hull

Özdemir

Barlas

2018

brod

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This study brings forward the results of previously published work of free surface flow simulation around a fast ship model. Experimental measurements and numerical simulations of a fast bare-hull ship model form are now extended to the same ship form with appendices for a wide range of Froude numbers. The governing equations are discretized by means of an unstructured finite volume mesh. The standard k-ε turbulence model and Volume of Fluid Method to capture the two phase media are used. The total resistance, due to wave and wake fields of the ship model with appendages and the resistance of the appendages alone are calculated numerically, and compared with the experiments. The experiments and computations were performed for 11 different Froude numbers between 0.103 and 0.322. For Froude numbers up to 0.25, numerical simulations found to be quite in agreement with the experiments. It has been found that appendages increase the total drag mainly by increasing the pressure resistance, and the effect of the appendages becomes more important as the flow speed gets higher.

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Assessment of URANS surface effect ship models for calm water and head waves

Cited by 7 publications

References 12 publications

A novel 2.5D method for solving the mixed boundary value problem of a surface effect ship

A novel 2.5D method for solving the mixed boundary value problem of a surface effect ship

A study on hydrodynamics of the air cushion of a high-speed PACSCAT

Free Surface Flow Simulation Around an Appended Ship Hull

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