Two and Three-Dimensional Pressure-Impulse Models of Wave Impact on Structures

1999 ◽  
Author(s):  
Deborah J. Wood ◽  
D. Howell Peregrine
Keyword(s):  
Three Dimensional ◽  
Wave Impact ◽  
Pressure Impulse

scholarly journals Pressure impulse theory for a slamming wave on a vertical circular cylinder

2019 ◽  
Vol 867 ◽  
Author(s):  
Amin Ghadirian ◽  
Henrik Bredmose
Keyword(s):  
Three Dimensional ◽  
Response Prediction ◽  
Impact Angle ◽  
Circular Cylinders ◽  
Model Parameters ◽  
Short Time Scale ◽  
Wave Impact ◽  
Pressure Impulse ◽  
Maximum Angle ◽  
Crest Length

A pressure impulse model is presented for wave impact on vertical circular cylinders. Pressure impulse is the time integral of the pressure during an impact of short time scale. The model is derived for a simplistic geometry and has relative impact height, crest length and cylinder radius as effective variables. The last parameter, the maximum angle of impact, is free and can be calibrated to yield the right force impulse. A progression of simpler pressure impulse models are derived in terms of a three-dimensional box generalization of the two-dimensional wall model and an axisymmetric model for vertical cylinders. The dependence on the model parameters is investigated in the simpler models and linked to the behaviour of the three-dimensional cylinder model. The model is next validated against numerical results for a wave impact for a phase- and direction-focused wave group. The maximum impact angle is determined by calibration against the force impulse. A good match of the pressure impulse fields is found. Further comparison to the force impulse of two common models in marine engineering reveals improved consistency for the present model. The model is found to provide a promising representation of the pressure impulse field, based on a limited number of input parameters. Its further validation and potential as a robust tool in force and response prediction is discussed.

Wave Impact on a Wall Using Pressure-Impulse Theory. I: Trapped Air

2000 ◽  
Vol 126 (4) ◽  
pp. 182-190 ◽  
Author(s):  
Deborah J. Wood ◽  
D. Howell Peregrine ◽  
Tom Bruce
Keyword(s):  
Wave Impact ◽  
Pressure Impulse ◽  
Trapped Air

Three-dimensional numerical modeling of cohesive sediment transport and wind wave impact in a shallow oxbow lake

2008 ◽  
Vol 31 (7) ◽  
pp. 1004-1014 ◽  
Author(s):  
Xiaobo Chao ◽  
Yafei Jia ◽  
F. Douglas Shields ◽  
Sam S.Y. Wang ◽  
Charles M. Cooper
Keyword(s):  
Numerical Modeling ◽  
Sediment Transport ◽  
Wind Wave ◽  
Three Dimensional ◽  
Cohesive Sediment ◽  
Oxbow Lake ◽  
Wave Impact ◽  
Cohesive Sediment Transport

Rogue Wave Impact on a Semi-Submersible Offshore Platform

2008 ◽  
Author(s):  
Murray Rudman ◽  
Paul Cleary ◽  
Justin Leontini ◽  
Matthew Sinnott ◽  
Mahesh Prakash
Keyword(s):  
Rogue Wave ◽  
Three Dimensional ◽  
Breaking Waves ◽  
Attractive Alternative ◽  
Wave Impact ◽  
Particle Hydrodynamics ◽  
Smoothed Particle ◽  
Dimensional Simulation ◽  
The Impact ◽  
Structural Motion

Full three-dimensional simulation of the impact of a rogue wave on a semi-submersible platform is undertaken using the Smoothed Particle Hydrodynamics (SPH) technique. Two different mooring configurations are considered: A Tension Leg Platform (TLP) system and a Taut Spread Mooring (TSM) system. It is seen that for a wave impact normal to the platform side, the heave and surge responses of the platform are significantly different for the two mooring systems. The TLP system undergoes large surge but comparatively smaller heave motions than the TSM system. The degree of pitch is very similar. The total tension in the mooring cables is approximately four times higher in the TSM system and exceeds the strength of the cables used in the simulation. SPH is seen to be an attractive alternative to standard methods for simulating the coupled interaction of highly non-linear breaking waves and structural motion.

A semi-analytical solution for the three-dimensional Wagner steep wave impact on a vertical circular cylinder

2020 ◽  
Vol 77 ◽  
pp. 902-921 ◽  
Author(s):  
Theodosis D. Tsaousis ◽  
Polycarpos K. Papadopoulos ◽  
Ioannis K. Chatjigeorgiou
Keyword(s):  
Analytical Solution ◽  
Circular Cylinder ◽  
Three Dimensional ◽  
Wave Impact ◽  
Steep Wave

Unsteady Reynolds-averaged Navier–Stokes investigation of free surface wave impact on tidal turbine wake

2021 ◽  
Vol 477 (2246) ◽  
pp. 20200703
Author(s):  
Zhisong Li ◽  
Kirti Ghia ◽  
Ye Li ◽  
Zhun Fan ◽  
Lian Shen
Keyword(s):  
Free Surface ◽  
Surface Wave ◽  
Surface Waves ◽  
Three Dimensional ◽  
Flow Characteristics ◽  
Navier Stokes ◽  
Wave Impact ◽  
Power Extraction ◽  
Tidal Turbine ◽  
Turbine Wake

Tidal current is a promising renewable energy source. Previous studies have investigated the influence of surface waves on tidal turbines in many aspects. However, the turbine wake development in a surface wave environment, which is crucial for power extraction in a turbine array, remains elusive. In this study, we focus on the wake evolution behind a single turbine and its interaction with surface waves. A numerical solver is developed to study the effects of surface waves on an industrial-size turbine. A case without surface wave and two cases with waves and different rotor depths are investigated. We obtain three-dimensional flow field descriptions near the free surface, around the rotor, and in the near- and far-wake. In a comparative analysis, the time-averaged and instantaneous flow fields are examined for various flow characteristics, including momentum restoration, power output, free surface elevation and vorticity dynamics. A model reduction technique is employed to identify the coherent flow structures and investigate the spatial and temporal characteristics of the wave–wake interactions. The results indicate the effect of surface waves in augmenting wake restoration and reveal the interactions between the surface waves and the wake structure, through a series of dynamic processes and the Kelvin–Helmholtz instability.

Numerical Simulation of Green Water on Deck with a Hybrid Eulerian-Lagrangian Method

2021 ◽  
pp. 1-18
Author(s):  
Kangping Liao ◽  
Wenyang Duan ◽  
Qingwei Ma ◽  
Shan Ma ◽  
Jianming Yang
Keyword(s):  
Structural Damage ◽  
Three Dimensional ◽  
Structure Design ◽  
Body Motion ◽  
Green Water ◽  
Wave Impact ◽  
Strongly Nonlinear ◽  
Multi Scale ◽  
Lagrangian Framework ◽  
Impact Phenomena

Green water on the ship deck in rough sea conditions may induce extreme impulsive wave impacts on superstructures and result in severe structural damage. It is of great importance to consider green water loads in ship structure design. However, there are many challenges in predicting green water loads due to the strongly nonlinear wave-ship interactions and the multiphase, multi-scale nature of the wave impact phenomena. In this article, a three-dimensional hybrid Eulerian-Lagrangian approach is proposed for simulating green water loads on the ship deck. It is extended from an efficient and accurate two-dimensional method developed for fluid-structure interaction problems. In this method, the flow field is solved on a fixed regular Cartesian grid system in an Eulerian framework, whereas the solid body motion is tracked with a set of markers immersed in the fluid and solved in a Lagrangian framework. Two benchmark cases, green water on a fixed simplified Floating Production Storage and Offloading (FPSO) model and green water on ship, are simulated. Comparison between experimental data and numerical results shows that our method is a viable choice for predicting green water loads.

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