開水路中におかれた障害物前面の渦の機構について

Abstract

In order to analyse the local flow near the bed and just upstream of the cylindrical peirs inopen channel, a flow model is proposed under consideration of the results of experiments. Themodel consists of horizontal two dimensional potential flows with line sink or source on the boundarysurface of the pier, in which the scale of back flow region resulting from sink or source decreases lin-early by height of horizontal section from the channel bed and does not vary in the section. Theresult of analysis by the model shows a good agreement with experimental flow patterns not onlyoutside the back flow region bat aloso inside of it, except the just neighbourhood of the pier bounda-ry. Such a method of apploach seems to be available to analyse the flow pattern upstream of thepier with other type of cross-section.