Dust Acoustic Gravity Vortices in Collisional Dusty Plasma

We study dust acoustic gravity modes in a partially ionized collisional dusty plasma in linear and non linear limits. In the linear regime unstable collisional dust acoustic gravity waves are found. In the non linear regime we found that the presence of frictional force strongly affects various type of vortex formation. It is shown that the condition for the formation of chains of vortices is modified due to the frictional force. Possible applications of the result in context of lower planetary dusty atmosphere and astrophysical dusty fluid are discussed