Two-fluid Modeling of Acoustic Wave Propagation in Gravitationally Stratified Isothermal Media

To study acoustic wave propagation and the corresponding energy deposition in partially ionized plasmas, we use a two-fluid computational model that treats neutrals charged particles (electrons ions) as two separate fluids. This takes into account ion-neutral collisions, ionization, recombination, allowing us to investigate both collisional reactive interactions between uncoupled ions plasmas. In present numerical simulations, initial density is specified reach hydrostatic equilibrium, comparison, chemical equilibrium also taken provide profile differs from typical profiles. External velocity drivers are then imposed generate monochromatic waves. As well known, upward propagating waves steepen gravitationally stratified plasmas due exponentially decreasing density, they heat nonlinear regimes where kinetic dissipated by shock interactions. particular, lower ionization fraction resulting significantly enhances heating efficiency. Moreover, process absorbs significant amount of energy, decoupling enhanced while considering recombination. Therefore, simulations without recombination may overestimate overall effects but underestimate dissipation. The results suggest more accurate could be essential for improving modeling