Simulation of mud erosion in the subsea stratified sand-mud beds

2015 ◽  
Author(s):  
Takero Yoshida ◽  
Georgios Fytianos ◽  
Hiroyuki Oyama ◽  
Toru Sato
Keyword(s):  
Numerical Simulation ◽  
Lattice Boltzmann ◽  
Methane Hydrate ◽  
Erosion Rate ◽  
Pore Space ◽  
Gas Production ◽  
Water Velocity ◽  
Model Parameters ◽  
Simulation Code ◽  
Boltzmann Method

Mud erosion in the subsea stratified sand-mud beds is a concern for production of methane gas from methane hydrate. It is expected that eroded mud may lead to well blockage. The goal of our work is to model of mud erosion that damages gas production. To approach this, we have developed a numerical simulation code and mud erosion is investigated to estimate model parameters. The water velocity in pore space is simulated by the Lattice Boltzmann Method (LBM). The paper shows the procedure to obtain erosion rate from distribution of shear stress on the mud surface.

Numerical simulation of vapor bubble growth on a vertical superheated wall using lattice Boltzmann method

2015 ◽  
Vol 25 (5) ◽  
pp. 1214-1230 ◽  
Author(s):  
Tao Sun ◽  
Weizhong Li ◽  
Bo Dong
Keyword(s):  
Heat Transfer ◽  
Numerical Simulation ◽  
Phase Change ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Nucleate Boiling ◽  
Numerical Results ◽  
Heat Transfer Mechanism ◽  
Content Type ◽  
Boltzmann Method

Purpose – The purpose of this paper is to test the feasibility of lattice Boltzmann method (LBM) for numerical simulation of nucleate boiling and transition boiling. In addition, the processes of nucleate and transition boiling on vertical wall are simulated. The heat transfer mechanism is discussed based on the evolution of temperature field. Design/methodology/approach – In this paper, nucleate boiling and transition boiling are numerically investigated by LBM. A lattice Boltzmann (LB) multiphase model combining with a LB thermal model is used to predict the phase-change process. Findings – Numerical results are in good agreement with existing experimental results. Numerical results confirm the feasibility of the hybrid LBM for direct simulations of nucleate and transition boiling. The data exhibit correct parametric dependencies of bubble departure diameter compared with experimental correlation and relevant references. Research limitations/implications – All the simulations are performed in two-dimensions in this paper. In the future work, the boiling process will be simulated in three-dimensional. Practical implications – This study demonstrated a potential model that can be applied to the investigation of phase change heat transfer, which is one of the effective techniques for enhance the heat transfer in engineering. The numerical results can be considered as a basic work or a reference for generalizing LB method in the practical application about nucleate boiling and transition boiling. Originality/value – The hybrid LBM is first used for simulation of nucleate and transition boiling on vertical surface. Heat transfer mechanism during boiling is discussed based on the numerical results.

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