Abstract
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.
Highlights
IntroductionAs the demand of oil/gas increases rapidly, offshore oil/gas production is continuously extended to deeper waters and more floating offshore structures with storage space, such as FPSOs and SPARs, are to be manufactured and installed including multi-well system
As the demand of oil/gas increases rapidly, offshore oil/gas production is continuously extended to deeper waters and more floating offshore structures with storage space, such as FPSOs and SPARs, are to be manufactured and installed including multi-well system.In order to increase the production/processing efficiency for floating platforms, many new ideas have been suggested
The new particle interaction models are verified through comparisons with published numerical and experimental data
Summary
As the demand of oil/gas increases rapidly, offshore oil/gas production is continuously extended to deeper waters and more floating offshore structures with storage space, such as FPSOs and SPARs, are to be manufactured and installed including multi-well system. A new MPS method is developed for multiliquidlayer system and the simulation results are compared with the three-liquid-layer-sloshing experiments by Molin et al [13]. The original MPS of Koshizuka and Oka [14], which includes nonphysical pressure fluctuations and less-optimal treatments, gradient/collision model, and tracing method for free-surface particles, has been improved by many researchers (e.g., Lee et al [3] and Gotoh [16]). A new MPS method for multiliquid layers including improved buoyancy model is developed (Kim et al [11]). The simulation results by the newly developed MPS program are compared with the experimental results by Molin et al [13] for three-layer-liquid sloshing. The case studies show that the newly developed program is very useful in simulating various engineering problems including multiple fluids and interfaces
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