A coupled SPH–FVM method for simulating incompressible interfacial flows with large density difference

In this study, lock-exchange experiments in a tank of rectangular upper cross section and a lower valley of trapezoidal shape are performed. This is a realistic model of the valleys, which occur in nature. The experiments are performed for equal depths of heavy and light fluid on both sides of the lock gate. Density difference between salt water and clear water is varied between 0.5% and 0.9%. This density difference exists in liquid waste whose spreading is an environmental problem. The release of pollutants into rivers, oil spills in the ocean and the outflow of desalinations plants are examples of man-made gravity currents that cause negative environmental impacts. The aim of this study is to contribute to a better understanding of the propagation and process of mixing of a gravity current with large density difference with water. The movement of the gravity current is monitored with a digital video of high definition, the front velocity is measured and the height of the front is captured. Twenty experiments were performed, ten inside the trapezoidal section (H = 5 or 10 cm) and ten over the trapezoidal section (H = 17.5 or 25 cm). Results are compared with those of gravity currents in lock-exchange experiments, which were performed by other researchers.

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Visualization and measurement of gas–liquid metal two-phase flow with large density difference using thermal neutrons as microscopic probes

Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment ◽

10.1016/s0168-9002(98)01300-x ◽

1999 ◽

Vol 424 (1) ◽

pp. 229-234 ◽

Cited By ~ 22

Author(s):

K Mishima ◽

T Hibiki ◽

Y Saito ◽

H Nishihara ◽

Y Tobita ◽

...

Keyword(s):

Liquid Metal ◽

Two Phase Flow ◽

Density Difference ◽

Phase Flow ◽

Thermal Neutrons ◽

Two Phase ◽

Large Density

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Thermals with large density difference

Atmospheric Environment (1967) ◽

10.1016/0004-6981(84)90137-9 ◽

1984 ◽

Vol 18 (6) ◽

pp. 1051-1057 ◽

Cited By ~ 13

Author(s):

W.D Baines ◽

E.J Hopfinger

Keyword(s):

Density Difference ◽

Large Density

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Consistent mass and momentum transport for simulating incompressible interfacial flows with large density ratios using the level set method

Computers & Fluids ◽

10.1016/j.compfluid.2012.04.002 ◽

2012 ◽

Vol 63 ◽

pp. 70-81 ◽

Cited By ~ 37

Author(s):

Mehdi Raessi ◽

Heinz Pitsch

Keyword(s):

Level Set Method ◽

Level Set ◽

Momentum Transport ◽

Interfacial Flows ◽

Large Density ◽

Density Ratios

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Feedout and Richtmyer–Meshkov instability at large density difference

Physics of Plasmas ◽

10.1063/1.1335829 ◽

2001 ◽

Vol 8 (2) ◽

pp. 592-605 ◽

Cited By ~ 31

Author(s):

Alexander L. Velikovich ◽

Andrew J. Schmitt ◽

John H. Gardner ◽

Nathan Metzler

Keyword(s):

Density Difference ◽

Large Density

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Gas Bubbles Expansion and Physical Dependences in Aluminum Electrolysis Cell: From Micro- to Macroscales Using Lattice Boltzmann Method

ISRN Materials Science ◽

10.1155/2014/454691 ◽

2014 ◽

Vol 2014 ◽

pp. 1-11 ◽

Cited By ~ 1

Author(s):

Mouhamadou Diop ◽

Frédérick Gagnon ◽

Li Min ◽

Mario Fafard

Keyword(s):

Lattice Boltzmann Method ◽

Lattice Boltzmann ◽

Density Ratio ◽

Gas Bubbles ◽

Immiscible Fluids ◽

Density Difference ◽

Electrolysis Cell ◽

Two Phase ◽

Large Density ◽

Boltzmann Method

This paper illustrates the results obtained from two-dimensional numerical simulations of multiple gas bubbles growing under buoyancy and electromagnetic forces in a quiescent incompressible fluid. A lattice Boltzmann method for two-phase immiscible fluids with large density difference is proposed. The difficulty in the treatment of large density difference is resolved by using nine-velocity particles. The method can be applied to simulate fluid with the density ratio up to 1000. To show the efficiency of the method, we apply the method to the simulation of bubbles formation, growth, coalescence, and flows. The effects of the density ratio and the initial bubbles configuration on the flow field induced by growing bubbles and on the evolution of bubbles shape during their coalescence are investigated. The interdependencies between gas bubbles and gas rate dissolved in fluid are also simulated.

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