Abstract：Large eddy simulations were conducted for turbulent pulsating flows using the commercial solver ANSYS-CFX. The drag reduction and the total energy consumption for pulsating flows were analyzed. The simulations included current dominated and wave dominated pulsating flows. The boundary layer characteristics of the current flow were affected by the superposition of the wave flow. The best drag reduction in the pulsating flows gave a 25% drag reduction when the non-dimensional pulsating amplitude was 5.5. The analysis indicates that the drag reduction is optimized when the pulsating flow is wave dominated and the wave boundary layer is laminar. Pulsating flows with simple sinusoidal pulsating patterns consume much more energy than steady flows.
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NING Tao, GU Chunwei. Numerical analysis of the drag reduction for turbulent pulsating pipe flows based on large eddy simulations. Journal of Tsinghua University(Science and Technology), 2017, 57(5): 511-515.
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