Unsteady RANS method for ship motions with application to roll for a surface combatant

2006 ◽  
Vol 35 (5) ◽  
pp. 501-524 ◽  
Author(s):  
Robert V. Wilson ◽  
Pablo M. Carrica ◽  
Fred Stern
Keyword(s):  
Ship Motions ◽  
Unsteady Rans ◽  
Surface Combatant ◽  
Rans Method

Prediction of Viscous Ship Roll Damping by Unsteady Navier-Stokes Techniques

1997 ◽  
Vol 119 (2) ◽  
pp. 108-113 ◽  
Author(s):  
R. A. Korpus ◽  
J. M. Falzarano
Keyword(s):  
Potential Flow ◽  
Turbulence Modeling ◽  
Numerical Technique ◽  
Turbulence Models ◽  
Navier Stokes ◽  
Ship Motions ◽  
Ship Hulls ◽  
Unsteady Rans ◽  
Flow Effects ◽  
Real Flow

This paper describes a numerical technique for analyzing the viscous unsteady flow around oscillating ship hulls. The technique is based on a general Reynolds-averaged Navier-Stokes (RANS) capability, and is intended to generate viscous roll moment data for the incorporation of real-flow effects into potential flow ship motions programs. The approach utilizes the finite analytic technique for discretizing the unsteady RANS equations, and a variety of advanced turbulence models for closure. The calculations presented herein focus on viscous and vortical effects without free-surface, and utilize k-epsilon turbulence modeling. Series variations are presented to study the effects of frequency, amplitude, Reynolds number, and the presence of bilge keels. Moment component breakdown studies are performed in each case to isolate the effects of viscosity, vorticity, and potential flow pressures.

scholarly journals Full-scale unsteady RANS simulations of vertical ship motions in shallow water

2016 ◽  
Vol 123 ◽  
pp. 131-145 ◽  
Author(s):  
Tahsin Tezdogan ◽  
Atilla Incecik ◽  
Osman Turan
Keyword(s):  
Shallow Water ◽  
Full Scale ◽  
Ship Motions ◽  
Unsteady Rans ◽  
Rans Simulations

scholarly journals Numerical Prediction of Ship Motions in Wave using RANS Method

2013 ◽  
Vol 50 (4) ◽  
pp. 232-239 ◽  
Author(s):  
Il-Ryong Park ◽  
Jin Kim ◽  
Yoo-Chul Kim ◽  
Kwang-Soo Kim ◽  
Suak-Ho Van ◽  
...  
Keyword(s):  
Numerical Prediction ◽  
Ship Motions ◽  
Rans Method

scholarly journals Comparison of CFD simulations with experimental data for a tanker model advancing in waves

2011 ◽  
Vol 3 (1) ◽  
pp. 1-8
Author(s):  
Hideo Orihara
Keyword(s):  
Experimental Data ◽  
Cfd Simulation ◽  
Ship Motions ◽  
Added Resistance ◽  
Regular Waves ◽  
Cfd Simulations ◽  
Unsteady Rans ◽  
Simulation Results ◽  
Wave Conditions ◽  
Hull Forms

ABSTRACTIn this paper, CFD simulation results for a tanker model are compared with experimental data over a range of wave conditions to verify a capability to predict the sea-keeping performance of practical hull forms. CFD simulations are conducted using WISDAM-X code which is capable of unsteady RANS calculations in arbitrary wave conditions. Comparisons are made of unsteady surface pressures, added resistance and ship motions in regular waves for cases of fully-loaded and ballast conditions of a large tanker model. It is shown that the simulation results agree fairly well with the experimental data, and that WISDAM-X code can predict sea-keeping performance of practical hull forms.

scholarly journals Numerical Analysis of Ship Motions in Beam Sea Using Unsteady RANS and Overset Grid Methods

2008 ◽  
Vol 45 (2) ◽  
pp. 109-123 ◽  
Author(s):  
Il-Ryong Park ◽  
Seyed Hamid Sadat Hosseini ◽  
Frederick Stern
Keyword(s):  
Numerical Analysis ◽  
Ship Motions ◽  
Overset Grid ◽  
Unsteady Rans

Prediction of Flow Features in Rotating Cavities With Axial Throughflow by RANS and LES

2009 ◽  
Author(s):  
Qinxue Tan ◽  
Jing Ren ◽  
Hongde Jiang
Keyword(s):  
Heat Transfer ◽  
Experimental Data ◽  
Flow Structure ◽  
Large Scale ◽  
Scale Model ◽  
Optimized Design ◽  
Flow Features ◽  
Unsteady Rans ◽  
Large Scale Flow ◽  
Rans Method

Rotating cavities with axial throughflow are found inside the compressor rotors of turbomachines. The flow pattern and heat transfer in the cavities are known as sophisticated problems. In this paper, the 3D compressible flow field in a rotating cavity is investigated numerically using a steady RANS method, an unsteady RANS method and LES. The numerical results based on the three methods are analyzed in detail and compared with the available experimental data. For the LES method with a subgrid-scale model, the instantaneous flow structure and the heat transfer can be captured very well. For the unsteady RANS method with an appropriate turbulence model, the large-scale flow structure can be revealed acceptably, and the heat transfer solution agrees with the experimental data with a certain error. For the steady RANS method, a reasonable flow structure cannot be obtained, while the distribution of the heat transfer has a same tendency and uncertain error with the experiments. Therefore, it is suggested that the steady RANS method can still be a numerical tool in the quite preliminary design of the rotating cavities, while the LES is more advanced from an academic view. Moreover, the unsteady RANS method is most appropriate for industry. It should be valuable in the detailed design computations for selecting the optimized design.

Scale Effect Studies on Hydrodynamic Performance for DTMB 5415 Using CFD

2018 ◽  
Author(s):  
Heng Zhang ◽  
Hang Zhang ◽  
Xuanshu Chen ◽  
Hao Liu ◽  
Xianzhou Wang
Keyword(s):  
Degrees Of Freedom ◽  
Wave Pattern ◽  
Resistance Coefficient ◽  
Body Motion ◽  
Hydrodynamic Performance ◽  
Scale Model ◽  
Ship Motions ◽  
Calm Water ◽  
Unsteady Rans ◽  
Scale Design

Making CFD with the capability of predicting ship scale design performance, rather than relying on scale model tests will help reduce design costs and provide a greater opportunity to develop more energy efficient ship designs. The key objective of this paper is to perform a fully nonlinear unsteady RANS simulation to predict the ship motions and resistance of a full scale DTMB 5415 ship model. The analyses are performed at design speeds, at a certain Fr number, using in-house computational fluid dynamics (CFD) to solve RANS equation coupled with six degrees of freedom (6DOF) solid body motion equations. RANS equations are solved by finite difference method and PISO arithmetic. Computations have been made using structured grid with overset technology. Simulation results shown that the total resistance coefficient in calm water at service speed is predicted by 2.36% error compared to the related towing tank results. The ship resistance for different scale demonstrated that the current in-house CFD model could predict the resistance in a reasonable range of the EFD data. The comparison of flow field for wave pattern for different scale model were analyzed and discussed.

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