The coherent structure of turbulent meandering flow is investigated using the technique which visualize both streamwise and side views simultaneously by fluorescent dye injection method.
The lifting "wall streamwise vortices" on "dye transport pattern", which is a large scale cohrent structure of turbulent meandering flow, are observed by streamwise and side views. It seems that these vortices are caused by the interaction between high speed fluid and large scale vortices near side wall.