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Tenth International Symposium on Turbulence and Shear Flow Phenomena
July, 7-9, 2017 , Swissotel Chicago, Chicago, Illinois, U.S.A.

DOI: 10.1615/TSFP10

EXPERIMENTAL STUDY AND LARGE EDDY SIMULATION OF ACCELERATING FLOW FROM AN INITIAL TURBULENT FLOW

pages 709-714
DOI: 10.1615/TSFP10.1210
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Краткое описание

In this paper, we report a combined experimental and LES study of transient flow in a rectangular channel accelerating from an initial turbulent flow following the opening of the control valve. We show that this transient flow undergoes a process of laminar-turbulent transition even though the initial flow is turbulent. This is consistent with the findings from the numerical studies of idealised flow transients (He & Seddighi 2013, 2015 and Seddighi et al 2014). The transient flow is characterised by a time developing laminar-like boundary layer, which later becomes unstable and breaks up into turbulence. This process is similar to the bypass transition of spatially developing boundary layer.

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