Stenosis   (see A8, A14, A15, A20, C4, C10, C11, C13, C18, C19, C32, C33) The stenosing lesions imputable to the intimous hyperlasy or to the advance of the atheromateous disease partially or entirely obstructs the vessels. Their geometry varies, but the transstenotic flows affinite with confined jets. These works follow the experimental studies conducted by M. Siouffi about fifteen years ago. Realized at the beginning in condition of permanent flow, these works are also done for flows of pulsatory physiological type. The geometric model studied represents an axisymetric stenosis of gaussian shape of a 75% section severity. These fundamental works' objectives is to determine all the characteristics of the post-stenotic comportment. This is to study the most precisely the comportment of the flow, to know its influence, and to contribute in the end not only to a better detection of the stenoses, but also to a better diagnose on the development of the intimous hyperlasy. Therefore, a complete analysis of the evolution of parietal frictions is realized in conditions of a physiological flow.