抄録
In pipe flow, a streamwise-localized periodic solution of Navier-Stokes equation was discovered by Avila et al (2013). Their solution is an edge state in the sense that it and its stable manifold can a form laminar/turbulent basin boundary. The edge state play a crucial role in the appearance of transient turbulence via a boundary crisis. As Reynolds number increases from that for laminar flow, the occurrence of turbulence and transient turbulence is observed. If the onset of transient turbulence is related with the boundary crisis, there should be close relationship between the edge state and relaminarization. Therefore, we report the association of the process of relaminarization and the flow represented by the edge state.
