Mechanical Stress Analysis of Different Shapes Pillars with Cnoidal Internal Wave Action

2013 ◽  
Vol 732-733 ◽  
pp. 417-420
Author(s):  
Xiao Chao Fan ◽  
Rui Jing Shi ◽  
Feng Ting Li ◽  
Bo Wei ◽  
Yue Dang
Keyword(s):  
Internal Wave ◽  
Stress Analysis ◽  
Internal Waves ◽  
Three Dimensional ◽  
Wave Force ◽  
Viscous Force ◽  
Inertia Force ◽  
Converted Wave ◽  
Numerical Wave Flume ◽  
Wave Flume

The numerical simulations of the flow around different pillars acted by the cnoidal internal waves have been made by building numerical wave flume based on FLUENT software. The cnoidal internal wave was created by using the push-pedal method, and the free surface was tracked by using VOF (volume of fluid) method. The three-dimensional different amplitude and period cnoidal internal waves were simulated. The inertia force and viscous force trends were analyzed, and for different pillars the total wave force were compared. There were some significance for stress analysis of the offshore terminal pillars. The converted wave force could alternative and treatment problems about square columns.

Study Based on FLUENT of Broken Internal Waves in Different Slope Angles

2014 ◽  
Vol 638-640 ◽  
pp. 1769-1777
Author(s):  
Zi Tong Yan ◽  
Liang Qiu Cheng ◽  
Feng Yi ◽  
Tai Zhong Chen ◽  
Han Sun ◽  
...  
Keyword(s):  
Internal Waves ◽  
Solitary Waves ◽  
Wave Breaking ◽  
Slope Angle ◽  
Ecological Environment ◽  
Internal Solitary Waves ◽  
Propagation Process ◽  
Numerical Wave Flume ◽  
Wave Flume ◽  
New Methods

Internal waves will break in the process of communication, the broken will make water in upper and lower mixing, which has significant influence on the hydrodynamic and layered characteristics of density stratification of the water. In order to reveal the propagation of internal solitary waves, a 3d numerical wave flume was built. The research of the propagation of internal solitary waves in the regular topography and broken on slopes was based on FLUENT. Comparing the fragmentation degree of different slope angle and researching the energy dissipation of the wave propagation process , which are supposed to successfully match the results with the experiment results, can provide new methods and means for the further study of internal wave breaking characteristics and the improvement of ecological environment of water bodies.

scholarly journals Estimation of Wave Force Acting on Bridge Superstructures due to the 2011 Tohoku Tsunami

2013 ◽  
Vol 8 (4) ◽  
pp. 605-611 ◽  
Author(s):  
Shojiro Kataoka ◽  
◽  
Masahiro Kaneko
Keyword(s):  
Highway Bridges ◽  
Wave Theory ◽  
Wave Force ◽  
Wave Forces ◽  
Numerical Wave Flume ◽  
Wave Flume ◽  
2011 Tohoku Tsunami ◽  
Time Histories ◽  
Numerical Wave ◽  
Tohoku Tsunami

Wave forces acting on the superstructures of two highway bridges affected by the 2011 Tohoku tsunami, the Shin-Aikawa Bridge and the Yanoura Bridge, are estimated combining 2-D FDM and a numerical wave flume (CADMAS-SURF) analysis. The superstructure of the Shin-Aikawa Bridge was washed out and swept 500 m away by the backwash. The Yanoura Bridge suffered no damage even though it was completely submerged in the tsunami. Time histories of the tsunami wave height and flow velocity are calculated using 2-D FDM, based on the nonlinear long wave theory. Lateral and uplift forces acting on the superstructures due to the simulated tsunami are then analyzed by the numerical wave flume. Comparisons between the analytical wave forces and corresponding loading capacities account for the differences in damage to the two bridges.

STUDY ON A HUGE TSUNAMI AROUND THE BREAKWATER HEAD BY THREE-DIMENSIONAL PARTICLE-BASED NUMERICAL WAVE FLUME

2020 ◽  
Vol 76 (2) ◽  
pp. I_283-I_288
Author(s):  
Hiroki KUBOTA ◽  
Naoki TSURUTA ◽  
Yu CHIDA ◽  
Shota ASAHI ◽  
Kenji TOOYAMA ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Numerical Wave Flume ◽  
Wave Flume ◽  
Numerical Wave

Numerical Simulation on Wave Force Acting on the Hollow Blocks

2013 ◽  
Vol 702 ◽  
pp. 37-43
Author(s):  
Xue Feng Chen ◽  
Kang Yang ◽  
Yu Cheng Li
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Mathematical Model ◽  
Wave Force ◽  
Regular Wave ◽  
Numerical Wave Flume ◽  
Wave Flume ◽  
Pressure Fields ◽  
Hollow Block ◽  
Numerical Wave

In order to study the wave force acting on the hollow blocks structures locating at the permeable foundation under the regular wave flume, the wave tank is established basing on improved N-S Equations. And the moving boundary’s generating wave and wave absorption of momentum source are adopted in the numerical wave flume. It can also be simulated permeable foundation by porous media module. Then mathematical model can be constructed under the interaction between waves and hollow block when PISO is used to couple velocity and pressure fields. At the same time, the numerically calculated results of the wave force acting on the hollow blocks are compared with the experimental data in agreement. In conclusion, the variation of the wave force with incident wave height and period is obtained through the numerical calculation.

scholarly journals Oblique internal-wave chain resonance over seabed corrugations

2017 ◽  
Vol 833 ◽  
pp. 538-562
Author(s):  
Louis-Alexandre Couston ◽  
Yong Liang ◽  
Mohammad-Reza Alam
Keyword(s):  
Internal Wave ◽  
Internal Waves ◽  
Resonance Condition ◽  
Incidence Angle ◽  
Three Dimensional ◽  
Resonant Interactions ◽  
Near Resonance ◽  
Chain Resonance ◽  
Small Scales ◽  
A Chain

Here we show that monochromatic long-crested corrugations on an otherwise flat seafloor can coherently scatter the energy of an oblique incident internal wave to multiple multi-directional higher-mode internal waves via a series of resonant interactions. We demonstrate that a resonance between seabed corrugations and a normally or slightly oblique incident internal wave results in a series of follow-up resonant interactions, which take place between the same corrugations and successively resonated shorter waves. A chain resonance of internal waves that carries energy to small scales is thus obtained, and we find that the Richardson number decreases by several orders of magnitude over the corrugated patch. If the incidence angle is large, and the incident wave perfectly satisfies a resonance condition with the topography, it turns out that not many higher-mode resonance or near-resonance conditions can be satisfied, such that energy stays confined within the first few modes. Nevertheless, if the incident waves are sufficiently detuned from satisfying a perfect resonance condition with the seabed corrugations, then we show that this frequency detuning may balance off the large detuning due to oblique incidence, leading to a chain resonance that again carries energy to small scales. The evolution of the incident and resonated wave amplitudes is predicted from the envelope equation for internal waves over resonant seabed topography in a three-dimensional rotating fluid, which we derive considering the Boussinesq and $f$-plane approximations with $f$ the Coriolis frequency, linear density stratification and small-amplitude corrugations. Our results suggest that topographic features on the ocean floor with a well-defined dominant wavenumber vector, through the chain resonance mechanism elucidated here, may play a more important role than previously thought in the enhancement of diapycnal mixing and energy dissipation.

Experimental Investigation on the Dynamic Response of Density-Stratified Fluid in a Submarine Trench

2009 ◽  
Author(s):  
Hwung-Hweng Hwung ◽  
Wen-Yang Hsu ◽  
Chi-Min Liu ◽  
Ray-Yeng Yang
Keyword(s):  
Image Processing ◽  
Experimental Investigation ◽  
Surface Water ◽  
Dynamic Response ◽  
Internal Wave ◽  
Internal Waves ◽  
Processing Technique ◽  
Image Processing Technique ◽  
Wave Flume ◽  
Incident Waves

The dynamic response of the generated internal wave as surface water propagating over a submarine trench is investigated in a wave flume. The image processing technique is used to observe the response of density-stratified interface. Two typical distinct phenomena of internal waves were caught in the experiments, which are standing internal waves usually occurred as the incident waves range from 0.6∼0.8 times the length of trench, and the traveling internal waves usually occurred outside this range.

Low-Frequency Acoustic Propagation Through Crossing Internal Waves in Shallow Water

2020 ◽  
Vol 28 (03) ◽  
pp. 1950013
Author(s):  
Alexey Shmelev ◽  
Ying-Tsong Lin ◽  
James Lynch
Keyword(s):  
Internal Wave ◽  
Shallow Water ◽  
Internal Waves ◽  
Three Dimensional ◽  
Low Frequency ◽  
Acoustic Energy ◽  
Full Field ◽  
Wave Trains ◽  
Acoustic Ducts ◽  
Numerical Approaches

Crossing internal wave trains are commonly observed in continental shelf shallow water. In this paper, we study the effects of crossing internal wave structures on three-dimensional acoustic ducts with both theoretical and numerical approaches. We show that, depending on the crossing angle, acoustic energy, which is trapped laterally between internal waves of one train, can be either scattered, cross-ducted or reflected by the internal waves in the crossing train. We describe the governing physics of these effects and illustrate them for selected internal wave scenarios using full-field numerical simulations.

scholarly journals A Numerical Study of the Forces on Two Tandem Cylinders Exerted by Internal Solitary Waves

2016 ◽  
Vol 2016 ◽  
pp. 1-15 ◽  
Author(s):  
Yin Wang ◽  
Lingling Wang ◽  
Hai Zhu ◽  
Hongwu Tang ◽  
Gang Wei
Keyword(s):  
Solitary Waves ◽  
Numerical Study ◽  
Three Dimensional ◽  
Circular Cylinders ◽  
Internal Solitary Waves ◽  
Gradient Distribution ◽  
Numerical Wave Flume ◽  
Wave Flume ◽  
Eddy Simulation ◽  
Les Model

A three-dimensional numerical wave flume is employed to investigate the forces exerted by internal solitary waves (ISWs) on a pair of circular cylinders in tandem arrangement, using large-eddy simulation (LES) model. The effect of the centre-to-centre distance (L) ranging from 1.5 to 5 diameters (D) is studied for various ISWs amplitudes (ηa) in the two-layer fluid system. Vertical-averaged vorticity distribution and vertical-averaged pressure gradient distribution in each layer are presented to investigate the different hydrodynamic interference between cylinders and the ISWs forces on each cylinder at variousL. Furthermore, the force behaviors of the two cylinders are also compared with that of an isolated cylinder in the same environment. The interaction between the two piles occurs in both layers, and it is found that, for1.5≤L/D<3.5, strong mutual interference appears between two cylinders; for3.5≤L/D<5, the two cylinders continue to influence each other in a weak-interference state; forL/D≥5, the interaction gradually decreases into a noninteracting state. This paper tries to provide some references to structural arrangement of double-cylinder structure and grouped-cylinder structure in stratified flow environment.

scholarly journals Internal wave attractors in three-dimensional geometries: trapping by oblique reflection

2018 ◽  
Vol 845 ◽  
pp. 203-225 ◽  
Author(s):  
G. Pillet ◽  
E. V. Ermanyuk ◽  
L. R. M. Maas ◽  
I. N. Sibgatullin ◽  
T. Dauxois
Keyword(s):  
Internal Wave ◽  
Internal Waves ◽  
Wave Energy ◽  
Transverse Direction ◽  
Three Dimensional ◽  
Direction Parallel ◽  
3D Geometry ◽  
Experimental Parameters ◽  
Set Up

We study experimentally the propagation of internal waves in two different three-dimensional (3D) geometries, with a special emphasis on the refractive focusing due to the 3D reflection of obliquely incident internal waves on a slope. Both studies are initiated by ray tracing calculations to determine the appropriate experimental parameters. First, we consider a 3D geometry, the classical set-up to get simple, two-dimensional (2D) parallelogram-shaped attractors in which waves are forced in a direction perpendicular to a sloping bottom. Here, however, the forcing is of reduced extent in the along-slope, transverse direction. We show how the refractive focusing mechanism explains the formation of attractors over the whole width of the tank, even away from the forcing region. Direct numerical simulations confirm the dynamics, emphasize the role of boundary conditions and reveal the phase shifting in the transverse direction. Second, we consider a long and narrow tank having an inclined bottom, to simply reproduce a canal. In this case, the energy is injected in a direction parallel to the slope. Interestingly, the wave energy ends up forming 2D internal wave attractors in planes that are transverse to the initial propagation direction. This focusing mechanism prevents indefinite transmission of most of the internal wave energy along the canal.

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