Numerical simulation of wall bounded and electrically excited Rayleigh-Taylor instability using incompressible smoothed particle hydrodynamics
Résumé
Numerical simulations using incompressible smoothed particle hydrodynamics (ISPH) method have been conducted on Rayleigh-Taylor instability (RTI) in a confined domain having an Atwood number of 1/3, influenced by the presence of an external electric field. Leaky dielectric model is used for each of the flow phases having different electric permittivities and conductivities. Results obtained show noticeable differences in evolution characteristics when subjected to the external electric field. It is observed that exposing the two-phase system to the electric field when heavy fluid to light fluid ratio of electric permittivities is smaller than that of electric conductivities, the resulting force configuration on the interface promotes spike descent whereas a reverse configuration of the ratios will result in a faster ascent of the bubble, bearing dramatically different interfacial profiles. These effects have been found to intensify at larger electric permittivity and electric field magnitudes. © 2014 Elsevier B.V.
Mots clés
Computer simulation
Dielectric materials
Electric fields
Electrohydrodynamics
Numerical methods
Numerical models
Permittivity
Rayleigh scattering
Electric field magnitude
Evolution characteristics
External electric field
Interfacial flows
Leaky dielectric models
Rayleigh-Taylor instabilities
Wall bounded flows
X ray microscopes
Article
continuum surface force
density
electric conductivity
electric field
electric potential
electrical parameters
hydrodynamics
mathematical parameters
polarization
rayleigh taylor instability
simulation
smoothed particle hydrodynamics
surface tension
viscosity