Assessment of the transition k-kL-ω model application to transitional oscillatory pipe flows

• DOI: 10.1121/1.5092605
• Publication Date: 2019-03-04T19:01:06Z
• Authors: Ahmed B. Ramadan; Ahmed I. Abd El-R...; Ashraf S. Sabry
• Keywords: Pipe flow; Pressure gradient

The flow transition from laminar to turbulent inside of typical thermoacoustic devices influences the heat-exchange capacities these and dramatically impacts overall performances as well. A few measurements [Eckmann Grotberg (1991), J. Fluid Mech. 222, 329–350; Hino, Sawamoto, Takasu (1976). 75, 193–207] direct simulations [Feldmann Wagner (2012). Turbul. 13(32), 1–28; Feldmann (2016a). New Results in Numerical Experimental Mechanics X, pp. 113–122] were reported that describe transitional oscillatory flows; however, almost no turbulence model has been developed enables accurate detection characterization intermittent fluctuations. present work aims assess applicability k-kL-ω pipe flows. sinusoidal pressure gradient is introduced into ANSYS finite-volume solver for field simulation at different acoustic frequencies, while a friction Reynolds number 1440 retained. stationary flows are first considered validation calibration against published LDA [Durst, Kikura, Lekakis, Jovanovic, Ye (1996). Exp. Fluids 20, 417–428] DNS results 1–28] addition Sexl's laminar-flow theory [Sexl (1930). Zeitschrift Phys. 61(5), 349–362]. Investigation total fluctuation kinetic energy oscillations reveals appearance fluctuations within near-wall region Wo = 13 during deceleration, fully predicted entire domain 5. Although qualitatively good agreement with experimental (1991). 329–350] findings 1–28], velocity profiles show poor corresponding data acceleration