Numerical Simulation of Mechanical Characteristics of a Metal Net for Deep-Sea Aquaculture

2019 ◽  
Vol 18 (6) ◽  
pp. 1273-1281
Author(s):  
Changping Chen ◽  
Hangfei Liu ◽  
Yu Huang ◽  
Jie Yang ◽  
Xinyu Liang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Deep Sea ◽  
Mechanical Characteristics

Numerical Simulation of Subsea Cluster Manifold Installation by the Sheave Method

2018 ◽  
Author(s):  
Yu Zhao ◽  
Yingying Wang ◽  
Liwei Li ◽  
Chao Yang ◽  
Yang Du ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Mathematical Model ◽  
South China Sea ◽  
Deep Sea ◽  
High Reliability ◽  
Two Dimensional ◽  
Complex Environment ◽  
Lumped Mass ◽  
Lumped Mass Method ◽  
The Mathematical Model

The sheave installation method (SIM) is an effective and non-conventional method to solve the installation of subsea equipment in deep water (>1000m), which has been developed to deploy the 175t Roncador Manifold I into 1,885 meters water depth in 2002. With the weight increment of subsea cluster manifold, how to solve its installation with the high reliability in the deep sea is still a great challenge. In this paper, the installation of the 300t subsea cluster manifold using the SIM is studied in the two-dimensional coordinate system. The mathematical model is established and the lumped mass method is used to calculate the hydrodynamic forces of the wireropes. Taking into account the complex environment loads, the numerical simulation of the lowering process is carried out by OrcaFlex. The displacement and vibration of the subsea cluster manifold in the z-axis direction and the effective tension at the top of the wireropes can be gotten, which can provide guidance for the installation of the cluster manifold in the South China Sea.

scholarly journals Numerical Simulation of Rock Failure Process with a 3D Grain-Based Rock Model

2020 ◽  
Vol 2020 ◽  
pp. 1-11
Author(s):  
Zengwei Zhang ◽  
Fan Chen ◽  
Chao Zhang ◽  
Chao Wang ◽  
Tuo Wang ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Tensile Strength ◽  
Compressive Strength ◽  
Mechanical Characteristics ◽  
Failure Process ◽  
Wellbore Stability ◽  
Rock Excavation ◽  
Rock Failure Process ◽  
Rock Model ◽  
Walled Cylinder

A grain-based rock model was developed and applied to study mechanical characteristics and failure micromechanics in thick-walled cylinder and wellbore stability tests. The rock is represented as an assembly of tetrahedral blocks with bonded contacts. Material heterogeneity is modeled by varying the tensile strength at the block contacts. This grain-based rock model differs from previous disk/sphere particle-based rock models in its ability to represent a zero (or very low) initial porosity condition, as well as highly interlocked irregular block shapes that provide resistance to movement even after contact breakage. As a result, this model can reach higher uniaxial compressive strength to tensile strength ratios and larger friction coefficients than the disk/sphere particle-based rock model. The model captured the rock fragmentation process near the wellbore due to buckling and spalling. Thin fragments of rock similar to onion skins were produced, as observed in laboratory breakout experiments. The results suggest that this approach may be well suited to study the rock disaggregation process and other geomechanical problems in the rock excavation.

A geometrically exact formulation for three-dimensional numerical simulation of the umbilical cable in a deep-sea ROV system

2015 ◽  
Vol 29 (2) ◽  
pp. 223-240 ◽  
Author(s):  
Wei-cai Quan ◽  
Zhu-ying Zhang ◽  
Ai-qun Zhang ◽  
Qi-feng Zhang ◽  
Yu Tian
Keyword(s):  
Numerical Simulation ◽  
Deep Sea ◽  
Three Dimensional ◽  
Exact Formulation ◽  
Umbilical Cable

Numerical Simulation by DDA and the Fabrics Analysis of Two Dimensional Experiment on Coarse Granular Material

2012 ◽  
Vol 170-173 ◽  
pp. 3621-3629
Author(s):  
Pei Xi Guo ◽  
Shao Zhong Lin
Keyword(s):  
Numerical Simulation ◽  
Laboratory Test ◽  
Granular Material ◽  
Simulation Model ◽  
Mechanical Characteristics ◽  
Discontinuous Deformation Analysis ◽  
Deformation Analysis ◽  
Two Dimensional ◽  
Stress Strain ◽  
Discontinuous Deformation

DDA(Discontinuous Deformation Analysis) was used to study the mechanical characteristics of coarse granular material (CGM). The numerical simulation model was found consulting the two Dimensional test of CGM,and the stress-strain curves obtained by the numerical simulation were basically in agreement with the results of laboratory test. It indicates that the numerical simulation is suitable for the mechanical characteristic research of CGM. In addition,the distribution statistic of several fabric elements about interaction between particles was also presented. Some relation between the stress-strain and fabric element change are found after analysis.

scholarly journals A Study on the Mechanical Characteristics of String Planes of Badminton Racquets by Nonlinear Finite Element Analysis

Proceedings ◽  
2020 ◽  
Vol 49 (1) ◽  
pp. 42
Author(s):  
Masatomo Takizawa ◽  
Akihiro Matsuda ◽  
Tomohiro Hashiguchi
Keyword(s):  
Numerical Simulation ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Mechanical Characteristics ◽  
Dynamic Effect ◽  
Elastic Model ◽  
Geometrical Shape ◽  
Element Analysis ◽  
Simulation Code ◽  
Yeoh Model

In this study, the finite element analysis of the string planes of badminton racquets was investigated to evaluate the effect of the mechanical characteristics of polymer strings. The nonlinear mechanical characteristics of commercially available polymer strings were obtained by the uniaxial loading tests experimentally. The effects of the strain rate on the mechanical characteristics of the polymer strings were also investigated to consider the dynamic effect on the numerical simulation. The numerical simulation code used to analyze the string planes of the badminton racquets was developed originally. A nonlinear elastic model (Yeoh model) was applied to the mechanical characteristics of the polymer string. Simulated results were compared with the experimental results. The effect of the mechanical characteristics of the polymer strings and the geometrical shape of the badminton racquets on the out-of-plane stiffnesses were investigated.

Numerical Simulation of the Fuel-Oil Cooling Process in Wrecked Ship

2005 ◽  
Author(s):  
J. M. Ferna´ndez Oro ◽  
C. Santolaria Morros ◽  
K. M. Argu¨elles Di´az ◽  
P. L. Garci´a Ybarra
Keyword(s):  
Numerical Simulation ◽  
Deep Sea ◽  
Sea Water ◽  
Characteristic Temperature ◽  
Thermal Conditions ◽  
Fuel Oil ◽  
Navier Stokes ◽  
Cooling Process ◽  
Order Of Magnitude ◽  
Definition Of

This work deals with a numerical simulation developed to predict the characteristic cooling times of a low-thermal diffusivity fuel-oil confined in the tanks of a wrecked ship. A typical scenario has been introduced, through the definition of tanks geometries, physical boundary conditions (deep sea temperatures) and reological properties of the fuel-oil. The fluidynamic behaviour of the oil (forced convection) inside the tanks, as well as the heat exchange with surrounding sea water has been simulated throughout a commercial code, FLUENT, that solves directly the Navier-Stokes set of equations, including energy one. The purpose is focused on the prediction of both spatial and temporal evolution of the fuel-oil characteristic temperature inside the tanks. The final objective is placed on the determination of the deadline in which asymptotic temperature curve of the fuel-oil converges to deep sea thermal conditions. Inspectional analysis is also outlined, as a powerful tool to predict an order of magnitude in the cooling process.

Numerical Simulation of the Fuel Oil Cooling Process in a Wrecked Ship

2006 ◽  
Vol 128 (6) ◽  
pp. 1390-1393 ◽  
Author(s):  
Jesús Manuel Fernández Oro ◽  
Carlos Santolaria Morros ◽  
Katia María Argüelles Díaz ◽  
Pedro Luis García Ybarra
Keyword(s):  
Numerical Simulation ◽  
Deep Sea ◽  
Sea Water ◽  
Fluid Dynamic ◽  
Characteristic Temperature ◽  
Thermal Conditions ◽  
Fuel Oil ◽  
Navier Stokes ◽  
Cooling Process ◽  
Order Of Magnitude

This work deals with a numerical simulation developed to predict the characteristic cooling times of a low-thermal diffusivity fuel oil confined in the tanks of a wrecked ship. A typical scenario has been introduced through the definition of tank geometries, physical boundary conditions (deep sea temperatures), and rheological properties of the fuel oil. The fluid dynamic behavior of the oil (free convection) inside the tanks, as well as the heat exchange with surrounding sea water has been simulated using a commercial code, FLUENT, which directly solves the Navier-Stokes set of equations, including energy. The purpose is focused on the prediction of both spatial and temporal evolution of the fuel oil characteristic temperature inside the tanks. The objective is to determine the deadline in which the asymptotic temperature curve of the fuel oil converges with deep sea thermal conditions. Inspectional analysis is also outlined, as a powerful tool to predict an order of magnitude in the cooling process.

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