Granular matter and granular flow.

Granular matter exists ubiquitous in our daily lives and the granular materials behave differently from any of the other standard and familiar forms of matter : solids, liquids or gases, and should therefore be considered an additional state of matter in its own right. They play an important role in many of our industries, such as mining, agriculture, civil engineering and pharmaceutical manufacturing. So, there has been a resurgence of interest in the granular matter in recent years within physics. But, the study of the granular matter is touching now in our country. In this paper, the study in this field in recent years is described and authors' work is introduced.