Abstract
In this paper, a damped nonlinear Schrödinger equation governing dust acoustic solitary waves is obtained in collisional dusty plasmas being comprised of dust grains with dust charge variation, Boltzmann distributed electrons and nonthermally distributed ions. The modulation instability (MI) of dust-acoustic waves is studied and the expression of the MI growth rate is given. The numerical results show that the nonthermal ions, collision effect and ion-to-electron temperature ratio have a strong influence on the existential region of different types of similaritons and the amplitude of similaritons. Furthermore, the different interactions of two similaritons are investigated.
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