A Fundamental Study on the Applicability of the Floating Large Size Tsunami Shelter

2016 ◽  
Author(s):  
Takuma Kishi ◽  
Kiyokazu Minami ◽  
Mitsuhiro Masuda
Keyword(s):  
Numerical Simulation ◽  
Implicit Method ◽  
Water Tank ◽  
Fundamental Study ◽  
Collision Model ◽  
Large Size ◽  
Tank Experiment ◽  
Water Tank Experiment ◽  
Moving Particle ◽  
Run Up

A floating large-size tsunami shelter (FLTS) has been proposed. The shelter can evacuate more than 1500 people to evacuate from run-up tsunami. The floating tsunami shelter can be lifted by buoyancy when tsunami hitting. In this study, First, Authors assumed Principal specifications of the FLTS from estimation of damage and second we evaluated the validity and safety of a floating large size tsunami shelter using the mooring dolphin by water tank experiment and numerical simulation that is moving particle semi-implicit method (MPS). As a result, enough performance was recognized. The mooring of dolphin was reduced the motion against 10m height tsunami than no moored. However it became clear about the numerical simulation that improvement was more necessary. In particular, the collision model was necessary improved by the existing model.

Simulation Program for Berthing and Mooring of Two Vessels in Consideration of Exact Hydrodynamic Interactions

2005 ◽  
Author(s):  
Shigeki Sakakibara ◽  
Masashi Wakabayashi ◽  
Kiyoshi Shimada ◽  
Hiroshi Yamaguchi
Keyword(s):  
Numerical Simulation ◽  
Crude Oil ◽  
Safety Evaluation ◽  
Simulation System ◽  
Hydrodynamic Interactions ◽  
Simulation Program ◽  
Present System ◽  
Water Tank ◽  
Tank Experiment ◽  
Water Tank Experiment

A numerical simulation system has been developed for safety evaluation of berthing and side-by-side transfer offshore operations between two vessels. Water-tank experiment has been conducted on behaviors of connected two vessels in waves, providing accuracy of the system. Also behavior of two vessels during ship-to-ship transfer offshore operation of crude oil has been simulated by the present system to demonstrate usefulness of the system.

Effects of Wall Condition of a Plunging Body on Splash

2011 ◽  
Author(s):  
Masao Yokoyama ◽  
Yoshihiro Kubota ◽  
Osamu Mochizuki
Keyword(s):  
Numerical Simulation ◽  
Implicit Method ◽  
Water Tank ◽  
Air Cavity ◽  
Slip Ratio ◽  
Mps Method ◽  
Swelling Degree ◽  
Living Things ◽  
Wall Condition ◽  
Moving Particle

Splashes generated by hydrogel sphere were simulated numerically and experimentally for investigating the effects of slip like mucus of living things. Numerical simulation using MPS (Moving Particle Semi-implicit) method was carried out. We defined the slip ratio as the swelling degree of hydrogel and installed the slip ratio into the MPS method. The swelling degree is the ratio of the weight of water against that of hydrogel. We simulated the splashes generated by the hydrogel spheres which had the different swelling degree plunging into water. As the evaluation of swelling degree on the surface of actual hydrogel spheres we also tested by using the hydrogel spheres plunging into water experimentally. The height of splash as a result of reaction of the air cavity became higher according to the increase of the swelling degree. The speed of hydrogel sphere sinking in water tank was also quicker in the numerical simulation. The reason of these results was that the velocity of water around the hydrogel sphere became quicker due to the slip on the surface.

A Fundamental Study on the Damage of Wash Up to the Quay of the Moored Vessel in Tsunamis Using the MPS Method Considered the Fender Influences

2018 ◽  
Author(s):  
Mitsuhiro Masuda ◽  
Kiyokazu Minami ◽  
Koichi Masuda
Keyword(s):  
Numerical Simulation ◽  
Three Dimensional ◽  
Simulation Method ◽  
Implicit Method ◽  
Spring Model ◽  
Mooring Lines ◽  
Fundamental Study ◽  
Protection Measures ◽  
Mps Method ◽  
Moving Particle

In the case of vessels are moored at the quay, the drift and the wash up to the quay due to the broke of mooring lines is occurred by the tsunamis. In the previous study, the authors are examined to the applicability of the proposed tsunami protection measures as the install more mooring lines (IMML) and the floating tsunami protection wharf (FTPW). However, the Fender influences were not considered in previous authors studies. In this study, the fender influences are considered on the numerical simulation. The three-dimensional MPS (Moving Particle Semi-implicit) method is used as numerical simulation method. The linear compressing spring model is used as the fender model. The fender influences were investigated against the influences of tsunami protection measures using IMML and the damage status of vessel.

Water-tank experiment and static numerical analysis of the mooring system of a controllable depth cage

2020 ◽  
Vol 91 ◽  
pp. 102118
Author(s):  
Junbo Zhang ◽  
Hiroki Shimizu ◽  
Hirotaka Nakashima ◽  
Yoichi Mizukami ◽  
Takero Yoshida ◽  
...  
Keyword(s):  
Numerical Analysis ◽  
Mooring System ◽  
Water Tank ◽  
Tank Experiment ◽  
Water Tank Experiment

scholarly journals NUMERICAL SIMULATION OF TSUNAMI CURRENTS

2011 ◽  
Vol 1 (32) ◽  
pp. 6 ◽  
Author(s):  
Eizo Nakaza ◽  
Tsunakiyo Iribe ◽  
Muhammad Abdur Rouf
Keyword(s):  
Numerical Simulation ◽  
Numerical Model ◽  
Open Channel ◽  
Implicit Method ◽  
Simulation Results ◽  
Moving Particle ◽  
Fixed Structure ◽  
Tsunami Currents

The paper aims to simulate Tsunami currents around moving and fixed structures using the moving-particle semi-implicit method. An open channel with four different sets of structures is employed in the numerical model. The simulation results for the case with one structure indicate that the flow around the moving structure is faster than that around the fixed structure. The flow becomes more complex for cases with additional structures.

Comprehensive Zebrafish Water Tank Experiment for Metabolic Studies of Testolactone

Zebrafish ◽  
2020 ◽  
Vol 17 (2) ◽  
pp. 104-111 ◽  
Author(s):  
Vinícius Figueiredo Sardela ◽  
Patricia D.O. Sardela ◽  
Raïssa R. Lisboa ◽  
Bernardo F. Matias ◽  
Carina S. Anselmo ◽  
...  
Keyword(s):  
Water Tank ◽  
Metabolic Studies ◽  
Tank Experiment ◽  
Water Tank Experiment

Numerical Simulation of Solitary Wave Using the Fully Lagrangian Method of Moving Particle Semi Implicit

2014 ◽  
Author(s):  
Mohammad Amin Nabian ◽  
Leila Farhadi
Keyword(s):  
Numerical Simulation ◽  
Free Surface ◽  
Solitary Wave ◽  
Stokes Equations ◽  
Rock Avalanche ◽  
Water Tank ◽  
Step Method ◽  
Fractional Step Method ◽  
Time Step ◽  
Moving Particle

A mesh-less numerical approach, called the moving particle semi implicit method (MPS), is presented to solve inviscid Navier-Stokes equations in a fully Lagrangian form using a fractional step method. This method consists of splitting each time step in two steps. The fluid is represented with particles and the motion of each particle is calculated through interactions with neighboring particles by means of a kernel function. In this paper, the MPS method is used to simulate a dynamic system consisting of a heavy box sinking vertically into a water tank, known as Scott Russell’s wave generator problem. This problem is an example of a falling rock avalanche into natural or artificial reservoirs. The box sinks into water tank and as a result the water is heaved up to form a solitary wave and a reverse plunging wave which forms a vortex. This vortex follows the solitary wave down the water tank. The good agreement between the numerical simulation and the analytical solution confirms the accuracy of the model. This proves the applicability of the present model in simulating complex free surface problems. The number of particles on free surface is presented as an indicator of stability of the model.

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