Trapping of Leaked Oil With Tandem Oil Fences With Lagrangian Analysis of Oil Droplet Motion

1998 ◽  
Vol 120 (1) ◽  
pp. 50-55 ◽  
Author(s):  
C. M. Lee ◽  
K. H. Kang ◽  
N. S. Cho
Keyword(s):  
Particle Tracking ◽  
Lagrangian Particle Tracking ◽  
Lagrangian Analysis ◽  
Lagrangian Particle ◽  
Droplet Motion ◽  
Tracking Method ◽  
Oil Droplet ◽  
Particle Tracking Method ◽  
Viscous Flow Field ◽  
Good Agreement

The effectiveness of two oil fences deployed in tandem to maximize the containment of oil is investigated. To assess the effectiveness of the tandem fences, the viscous flow field around the fences in tandem are analyzed numerically. Then, the trajectories of oil droplets which escaped beneath the fore fence are computed applying the Lagrangian particle-tracking method, to check under what conditions the droplet can be contained between the tandem fences. The validity of the calculated trajectories is checked experimentally by using spherical beads made of paraffin and droplets of kerosene, and the model fence of draft of 4 cm. The numerically predicted trajectories of the droplets show fairly good agreement with the experimental results. The method is applied to predict the motion of the weathered oil. It is shown, numerically, that most of the leaked oil can be trapped between tandem fences, when the distance between the fences is about 10 times the draft of the fore fence.

Numerical Simulation of Microparticles Motion in Two-Phase Bubbly Flow

2020 ◽  
Author(s):  
Hiroyuki Yoshida ◽  
Shinichiro Uesawa
Keyword(s):  
Particle Tracking ◽  
Simulation Method ◽  
Interface Tracking ◽  
Liquid Interfaces ◽  
Lagrangian Particle Tracking ◽  
Lagrangian Particle ◽  
Two Phase ◽  
Tracking Method ◽  
Particle Tracking Method ◽  
Removal Equipment

Abstract The radioactive aerosol removal equipment is used as one of the safety systems of nuclear reactors. In this equipment, microparticles of aerosol are removed through gas-liquid interfaces of two-phase flow. The mechanism related to the removal of microparticles through the gas-liquid interface is not precise; a numerical evaluation method of performance of aerosol removal equipment is not realized. Then, we have started to construct a numerical simulation method to simulate the removal of microparticles through gas-liquid interfaces. In this simulation method, a detailed two-phase flow simulation code TPFIT is used as the basis of this method. TPFIT adopts an advanced interface tracking method and can simulate interface movement and deformation directly. Also, to simulate the movement of particles, the Lagrangian particle tracking method is incorporated. By combining the interface tracking method, and the Lagrangian particle tracking method, the interaction between interfaces and microparticles can be simulated in detail. To solve the Lagrangian equations of particles, fluid properties and fluid velocity surrounding aerosol particles are evaluated by considering the relative position of particles and gas-liquid interface, to simulate particle movement near the interface. In this paper, we show an outline and preliminary results of this simulation method.

Dynamics of rapidly depressurized multiphase shock tubes

2019 ◽  
Vol 880 ◽  
pp. 441-477 ◽  
Author(s):  
D. Zwick ◽  
S. Balachandar
Keyword(s):  
Particle Tracking ◽  
Volcanic Eruptions ◽  
Lagrangian Particle Tracking ◽  
Mean Flow ◽  
Lagrangian Particle ◽  
Solid Mixture ◽  
The Mean ◽  
Set Up ◽  
Regime Map ◽  
Good Agreement

Rapid depressurization is a fluid phenomenon that occurs in many industrial and natural applications. Its behaviour is often complicated by the formation, propagation and interaction of waves. In this work, we perform computer simulations of the rapid depressurization of a gas–solid mixture in a shock tube. Our problem set-up mimics previously performed experiments, which have been historically used as a laboratory surrogate for volcanic eruptions. The simulations are carried out with a discontinuous Galerkin compressible fluid solver with four-way coupled Lagrangian particle tracking capabilities. The results give an unprecedented look into the complex multiphase physics at work in this problem. Different regimes have been characterized in a regime map that highlights the key observations. While the mean flow behaviour is in good agreement with experiments, the simulations show unexpected accelerations of the particle front as it expands. Additionally, a new lifting mechanism for gas bubble (void) growth inside the gas–solid mixture is detailed.

scholarly journals 3D Lagrangian particle tracking of a subsonic jet using multi-pulse Shake-The-Box

2021 ◽  
Vol 123 ◽  
pp. 110346
Author(s):  
Peter Manovski ◽  
Matteo Novara ◽  
Nagendra Karthik Depuru Mohan ◽  
Reinhard Geisler ◽  
Daniel Schanz ◽  
...  
Keyword(s):  
Particle Tracking ◽  
Lagrangian Particle Tracking ◽  
Lagrangian Particle ◽  
Subsonic Jet
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