Investigating the effects of viscosity and density ratio on the numerical analysis of Rayleigh-Taylor instability in two-phase flow using Lattice Boltzmann method: From early stage to equilibrium state

2021 ◽  
Vol 411 ◽  
pp. 126490
Author(s):  
Bahrul Jalaali ◽  
Muhammad Ridlo Erdata Nasution ◽  
Kumara Ari Yuana ◽  
Deendarlianto ◽  
Okto Dinaryanto
Keyword(s):  
Numerical Analysis ◽  
Equilibrium State ◽  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Early Stage ◽  
Density Ratio ◽  
Phase Flow ◽  
Two Phase ◽  
Rayleigh Taylor Instability ◽  
Boltzmann Method

On the lattice Boltzmann method simulation of a two-phase flow bioreactor for artificially grown cartilage cells

2008 ◽  
Vol 41 (16) ◽  
pp. 3455-3461 ◽  
Author(s):  
M.A. Hussein ◽  
S. Esterl ◽  
R. Pörtner ◽  
K. Wiegandt ◽  
T. Becker
Keyword(s):  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Two Phase Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Cartilage Cells ◽  
Boltzmann Method

Rayleigh-Taylor Instability Studied With Multi-Relaxation Lattice Boltzmann Method

2013 ◽  
Author(s):  
Saeed J. Almalowi ◽  
Dennis E. Oztekin ◽  
Alparslan Oztekin
Keyword(s):  
Lattice Boltzmann Method ◽  
Lattice Boltzmann ◽  
Early Stage ◽  
Density Ratio ◽  
Side Wall ◽  
Immiscible Fluids ◽  
Distribution Functions ◽  
Lattice Arrangement ◽  
Boltzmann Method ◽  
Late Stages

Multi relaxation lattice Boltzmann method is implemented to study Rayleigh-Taylor instabilities. Two immiscible fluids (oil and water) are arrayed into three layers. D2Q9 lattice arrangement for two dimensional computational domains is employed. Density distribution functions for each fluid and distribution functions for the coloring step are determined. The evolution of the interface is identified with the coloring step. Buoyancy and other interaction forces, created by buoyancy, between phases are modeled. Two cases are studied one with periodic boundary condition instead of a side wall, and one bounded on all sides. The study is done with an aspect ratio of two and a density ratio of 1.2. The early and late stages of the instability are characterized. The early stage of both cases shows the initial periodic disturbance being amplified rapidly on the lower interface. The late stages show mushroom-like structures, with significant distortions occurring on the bounded case.

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