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ISSN オンライン: 2642-0554

DNS OF TURBULENT FLOW IN AN OPEN CHANNEL WITH A LONGITUDINALLY RIDGED BOTTOM WALL

Fumiaki Muramatsu
Department of Mechanical Engineering, Faculty of Science and Technology, Science University of Tokyo, Noda-shi, Chiba-ken 278-8510

Hiroshi Kawamura
Department of Mechanical Engineering Faculty of Science and Technology Science University of Tokyo Noda-shi, Chiba 278 Japan

要約

A DNS of turbulent channel with a ridged bottom has been carried out to simulate the sand ribbons over the river bed. Two cases are considered; one is a ridged closed channel with ridged top and bottom walls and the other is the one with a ridged bottom and a free top surface. The latter case reproduces well the flow structure around the ridge in the actual river. A low speed streak over the ridge is captured by the conditional sampling and its structure is discussed.