Transformation between ion sound waves and shear vortices in plasma with strong shear flow

Temporal evolution of the low frequency electrostatic perturbations in an unmagnetized plasma with strong shear flow is investigated. From fluid equations, the differential equations governing the low frequency electrostatic perturbations are deduced. Using the Non-modal approach, the temporal evolution equations with Spatial Fourier Harmonics for the disturbed quantities are obtained, and have been studied numerically. Numerical calculations show that the shear vortices can be transformed into the ion sound waves under the condition of high shear parameter