scholarly journals Development of Moving Particle Simulation Method for Multiliquid-Layer Sloshing

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Kyung Sung Kim ◽  
Moo Hyun Kim ◽  
Jong-Chun Park
Keyword(s):  
Surface Tension ◽  
Oil And Gas ◽  
Particle Interaction ◽  
Excitation Frequency ◽  
Simulation Method ◽  
Particle Simulation ◽  
Offshore Structure ◽  
Mps Method ◽  
Buoyancy Correction ◽  
Moving Particle

The mixed oil and gas including water and sand are extracted from well to offshore structure. This mixed fluid must be separated for subsequent processes by using wash tanks or separators. To design such a system, a proper numerical-prediction tool for multiphase fluids is required. In this regard, a new moving particle simulation (MPS) method is developed to simulate multiliquid-layer sloshing problems. The new MPS method for multifluid system includes extra search methods for interface particles, boundary conditions for interfaces, buoyancy-correction model, and surface-tension model for interface particles. The new particle interaction models are verified through comparisons with published numerical and experimental data. In particular, the multiliquid MPS method is verified against Molin et al’s (2012) experiment with three liquid layers. In case of excitation frequency close to one of the internal-layer resonances, the internal interface motions can be much greater than top free-surface motions. The verified multiliquid MPS program is subsequently used for more nonlinear cases including multichromatic multimodal motions with larger amplitudes, from which various nonlinear features, such as internal breaking and more particle detachment, can be observed. For the nonlinear case, the differences between with and without buoyancy-correction and surface-tension models are also demonstrated.

Simulation of Multiliquid-Layer Sloshing With Vessel Motion by Using Moving Particle Semi-Implicit Method

2015 ◽  
Vol 137 (5) ◽  
Author(s):  
Kyung Sung Kim ◽  
Moo-Hyun Kim ◽  
Jong-Chun Park
Keyword(s):  
Gas Production ◽  
Particle Simulation ◽  
Small Scale ◽  
Linear Potential ◽  
Operational Effectiveness ◽  
Mps Method ◽  
Moving Particle ◽  
Vessel Motion ◽  
Linear Potential Theory ◽  
Oil Gas

For oil/gas production/processing platforms, multiple liquid layers can exist and their respective sloshing motions can also affect operational effectiveness or platform performance. To numerically simulate those problems, a new multiliquid moving particle simulation (MPS) method is developed. In particular, to better simulate the relevant physics, robust self-buoyancy model, interface searching model, and surface-tension model are developed. The developed multiliquid MPS method is validated by comparisons against experiment in which three-liquid-sloshing experiment and the corresponding linear potential theory are given. The validated multiliquid MPS program is subsequently coupled with a vessel-motion program in time domain to investigate their dynamic-coupling effects. In case of multiple liquid layers, there exists a variety of sloshing natural frequencies for respective interfaces, so the relevant physics can be much more complicated compared with the single-liquid-tank case. The simulation program can also reproduce the detailed small-scale interface phenomenon called Kelvin–Helmholtz instability. The numerical simulations also show that properly designed liquid cargo tank can also function as a beneficial antirolling device.

Solving 2-D Slamming Problems by the Higher-Order MPS Method With an Improved Pressure Gradient Model

2019 ◽  
Author(s):  
Ruosi Zha ◽  
Heather Peng ◽  
Wei Qiu
Keyword(s):  
Pressure Gradient ◽  
Kernel Function ◽  
Particle Interaction ◽  
Interaction Model ◽  
Water Entry ◽  
Higher Order ◽  
Mps Method ◽  
First Order ◽  
Moving Particle ◽  
Good Agreement

Abstract A higher-order moving particle semi-implicit (MPS) method was developed to solve water entry problems. The Wendland kernel function was applied in the particle interaction model. Various models for pressure gradient were investigated. To overcome the inconsistency in the original MPS methods, a pressure gradient correction was implemented to guarantee the first-order consistency of gradient. The corrective matrix was modified by using the derivative of the kernel function. A particle shifting technique was also applied to improve the numerical stability. Validation studies were carried out for water entry of a rigid wedge with the tilting angles of 0°, 10° and 20°, and a rigid ship section. The solutions by the present method are generally in good agreement with experimental data and other published numerical results.

A novel ghost cell boundary model for the explicit moving particle simulation method in two dimensions

2020 ◽  
Vol 66 (1) ◽  
pp. 87-102 ◽  
Author(s):  
Zumei Zheng ◽  
Guangtao Duan ◽  
Naoto Mitsume ◽  
Shunhua Chen ◽  
Shinobu Yoshimura
Keyword(s):  
Simulation Method ◽  
Two Dimensions ◽  
Particle Simulation ◽  
Cell Boundary ◽  
Ghost Cell ◽  
Particle Simulation Method ◽  
Boundary Model ◽  
Moving Particle

Simulation of Multi-Liquid-Layer Sloshing With Vessel Motion by Using Moving Particle Simulation

2014 ◽  
Author(s):  
Kyung Sung Kim ◽  
Moo Hyun Kim ◽  
Jong-Chun Park
Keyword(s):  
Simulation Method ◽  
Gas Production ◽  
Particle Simulation ◽  
Linear Potential ◽  
Particle Simulation Method ◽  
Moving Particle ◽  
Vessel Motion ◽  
Linear Potential Theory ◽  
Oil Gas ◽  
Surface Tension Model

For oil/gas production/processing platforms, multiple liquid layers can exist and their respective sloshing motions can also affect platform performance. To numerically simulate those problems, a new multi-liquid MPS (Moving Particle Simulation) method is developed. In particular, to better simulate the relevant physics, robust self-buoyancy model, interface searching model, and surface-tension model are developed. The developed multi-liquid MPS method is validated by comparisons against Molin et al’s (2012) three-liquid-sloshing experiment and the corresponding linear potential theory. The verified multi-liquid MPS program is subsequently coupled with a vessel-motion program in time domain to investigate their dynamic-coupling effects. In case of multiple liquid layers, there exist more than one sloshing natural frequencies, so the relevant physics can be much more complicated compared with the single-liquid-tank case. The numerical simulations also show that liquid cargo can function as a beneficial anti-rolling device.

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