Time-Domain Nonlinear Wave-Current Interaction with A Steep Wave Riser Considering Internal Flow Effect

2021 ◽  
Vol 35 (3) ◽  
pp. 410-421
Author(s):  
Lian-yang Tang ◽  
Yong Cheng ◽  
Chun-yan Ji
Keyword(s):  
Nonlinear Wave ◽  
Time Domain ◽  
Internal Flow ◽  
Flow Effect ◽  
Current Interaction ◽  
Steep Wave

Time Domain Assessment of Nonlinear Coupled Ship Motions and Sloshing in Free Surface Tanks

2015 ◽  
Author(s):  
Jose Luis Cercos-Pita ◽  
Gabriele Bulian ◽  
Antonio Souto-Iglesias
Keyword(s):  
Free Surface ◽  
Time Domain ◽  
Smoothed Particle Hydrodynamics ◽  
Internal Flow ◽  
Ship Motions ◽  
Simulation Approach ◽  
Safe Operation ◽  
External Fluid ◽  
Particle Hydrodynamics ◽  
Smoothed Particle

Ships at sea almost invariably carry liquids onboard, and liquids are contained in appropriate tanks. Being able to take into account the effects of liquids onboard when predicting ship motions is, therefore, of utmost importance for the safe operation of a vessel. In certain conditions, such predictions also require taking into account nonlinearities in both ship motions and in the internal flow, and linear approaches are not sufficient. Within this context, the present paper describes a simulation approach where a blended 6-DOF nonlinear ship motions prediction solver handling the external fluid-ship interaction, is coupled with a Smoothed-Particle-Hydrodynamics (SPH) solver for simulating the internal flow tank dynamics. The solvers are described and an example application is reported.

scholarly journals Nonlinear Wave–Current Interaction in Water of Finite Depth

2016 ◽  
Vol 142 (6) ◽  
pp. 04016009 ◽  
Author(s):  
Zhen Liu ◽  
Zhiliang Lin ◽  
Longbin Tao ◽  
Jian Lan
Keyword(s):  
Nonlinear Wave ◽  
Finite Depth ◽  
Current Interaction

Time-Domain Analysis of Floating Bodies with Forward Speed

2002 ◽  
Vol 124 (2) ◽  
pp. 66-73 ◽  
Author(s):  
Gu¨nther F. Clauss ◽  
Katja Stutz
Keyword(s):  
Nonlinear Wave ◽  
Time Domain ◽  
Degrees Of Freedom ◽  
Wave Structure ◽  
Nonlinear Effects ◽  
Time Domain Analysis ◽  
Offshore Structures ◽  
Driving Mechanism ◽  
Forward Speed ◽  
Transient Wave

Broaching, surf-riding, and capsizing of ships and offshore structures are transient wave-structure interactions which imply high risks for crew, vessel and cargo. As nonlinear effects are of great importance, time-domain investigations are indispensable. For unveiling the associated driving mechanism of these critical motions, it is desirable to analyze the cause-reaction chains in detail: Depending on the transient wave elevation, we obtain an instationary pressure distribution on the wetted surface of the cruising vessel. Resulting forces and moments excite vessel motions in six degrees of freedom. Based on the linear panel-method program for transient wave-body interactions, TiMIT [Korsmeyer et al. (1999)], this paper investigates seakeeping characteristics of offshore structures with forward speed. Results are presented in frequency and time domain. The procedure allows to identify critical seaways, and to analyze cause-reaction chains in deterministic wave sequences where critical and steep wave packets are embedded in random seas. The detailed evaluation reveals that large roll and pitch motions are easily reduced by variation of course and speed. For investigating the mechanism of wave/structure interactions, this paper introduces the relevant time-domain methodology, and indicates how nonlinear wave characteristics can be introduced in the time-stepping analysis. In subsequent steps nonlinear wave/structure interactions will also be considered.

scholarly journals Nonlinear Wave Evolution in Interaction with Currents and Viscoleastic Muds

2021 ◽  
Vol 9 (5) ◽  
pp. 529
Author(s):  
Elham Sharifineyestani ◽  
Navid Tahvildari
Keyword(s):  
Surface Wave ◽  
Nonlinear Wave ◽  
Laboratory Data ◽  
Domain Model ◽  
Random Wave ◽  
Random Waves ◽  
Wave Interactions ◽  
Wave Damping ◽  
Surface Wave Propagation ◽  
Current Interaction

A numerical model is extended to investigate the nonlinear dynamics of surface wave propagation over mud in the presence of currents. A phase-resolving frequency-domain model for wave-current interaction is improved to account for wave modulations due to viscoelastic mud of arbitrary thickness. The model compares well with published laboratory data and performs slightly better than the model with viscous mud-induced wave damping mechanism. Monochromatic and random wave simulations are conducted to examine the combined effect of currents, mud-induced wave dissipation and modulation, and nonlinear wave-wave interactions on surface wave spectra. Results indicate that current effects on wave damping over viscoelastic mud is not as straightforward as that over viscous mud. For example, while opposing currents consistently increase damping of random waves over viscous mud, they can decrease damping over viscoelastic mud due to high variations in frequency-dependent damping stemming from mud’s elasticity. It is shown that a model that assumes the mud layer to be thin for simplification can overestimate wave damping over thick mud layers.

scholarly journals Effect of Wave-Current Interaction on Structural Responses of a Very Long and Side-Anchored Floating Bridge

2020 ◽  
Author(s):  
Jian Dai ◽  
Bjørn Christian Abrahamsen ◽  
Bernt Johan Leira
Keyword(s):  
Time Domain ◽  
Transfer Functions ◽  
Computational Study ◽  
Three Dimensional ◽  
Time Domain Analysis ◽  
Bridge Model ◽  
Structural Responses ◽  
Floating Bridge ◽  
Current Interaction ◽  
The Time Domain

Abstract This paper is concerned with a computational study on the hydroelastic response of a long, straight and side-anchored fjord-crossing floating bridge accounting for the wave-current interaction. The effect of this interaction on a single bridge pontoon is investigated by using the three-dimensional potential solver VERES3D. The frequency-dependent hydrodynamic coefficients and excitation force transfer functions are presented and compared with WAMIT results where the current effect is ignored. Based on the frequency domain results, an approach to account for the wave-current interaction in time domain analysis is proposed. Next, a generic straight and side-anchored floating bridge model is put forward to examine the stochastic structural responses in the time domain. For the purpose of comparison, the bridge responses under waves and current without interaction are also investigated. This study attempts to quantify the wave-current interaction effect on the structural responses of a floating bridge and provide useful recommendations and suggestions to researchers and engineers for their study of similar structures.

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