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ISSN オンライン: 2642-0554

A DNS STUDY OF EFFECTS OF REYNOLDS NUMBER ON UNSTEADY CHANNEL FLOW

S. He
School of Engineering and Physical Sciences, University of Aberdeen, Aberdeen AB24 3UE; Department of Mechanical Engineering, University of Sheffield, Mappin Street, Sheffield,S1 3JD, UK

Mehdi Seddighi
School of Engineering, University of Aberdeen, Aberdeen AB24 3UE; Department of Mechanical Engineering, University of Sheffield, Mappin Street, Sheffield,S1 3JD, UK; School of Engineering, Technology and Maritime Operations, Liverpool John Moores University, Liverpool, L3 3AF, United Kingdom

要約

We have previously shown that the response of turbulence in a transient channel flow is effectively a laminar-turbulent bypass transition. In that study, only one step-change flow between fixed initial and final Reynolds numbers was investigated. This paper reports a series of new simulations with a range of initial and final Reynolds numbers. All cases studied show characteristics of transition. The main effect of varying the Reynolds number can be attributed to the change of the 'free-stream' turbulence intensity and the critical equivalent Reynolds numbers of all cases are well correlated with a simple function of the initial turbulence intensity.