Numerical investigation of electrically excited RTI using ISPH method

The influence of external electric field on the Rayleigh Taylor instability in a confined domain is numerically investigated using Smoothed Particle Hydrodynamics method. The leaky dielectric model is used for each of the flow phases having different electric permittivity and conductivities. The results are obtained for an Atwood number of 1/3 and gravitational Bond number of 100. It is shown that the electric force consists of two force components, namely the polarization force and electric field force. The polarization force acts in the direction of electric permittivity gradient of fluid phases at the vicinity of interface while the electric field force is influenced by the electric charge and electric field intensity. The role of electric force on the instability will be tested by adjusting the electric permittivity magnitudes of both fluid phases, keeping their ratio constant. The results will be presented for two permittivity ratios similar to those which have already been discussed.