Abstarct: Jet flow with desired physical conditions thought lots of applications in industrial and scientific scope has been the most important subjects in fluid mechanic and from appearance of fluid mechanic theory; many researchers have attended this subject. Orifice geometry of jets introduce in two kind of planar and circular. Through special geometry of circular jets, the researchers have had more attention on this kind. Therefore, there isn’t enough information about planar jet and in this thesis we attempt to study planar jets. In this study, we attempted to analyze two dimensional incompressible jet flows by direct numerical simulation method without any modeling or simplification assumption. Also we replaced baxse fluid with nanofluid and see the new result. the result shows in laminar jet when volume concentration of particle increased, increased. In forced jet when volume concentration of particle increased, the amplitude of noise decreased.