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Direct numerical simulation of a three-dimensional turbulent boundary layer (1990)

Moin, P. ; Shih, T.-H. ; Driver, D. ; [et al.]

New York, NY : American Institute of Physics (AIP)

Physics of Fluids 2 (1990), S. 1846-1853

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ISSN: 1089-7666

Source: AIP Digital Archive

Topics: Physics

Notes: The effects of transverse strain on an initially two-dimensional turbulent boundary layer are studied in a direct numerical simulation of a planar channel flow with impulsively started transverse pressure gradient. Consistent with experiments in three-dimensional boundary layers, the simulation shows a decrease in the Reynolds shear stress with increasing transverse strain. Also, the directions of the Reynolds shear stress vector and the mean velocity gradient vector were found to differ. In addition, the simulation shows a drop in the turbulent kinetic energy. Terms in the Reynolds stress transport equations were computed. The balances indicate that the decrease in turbulent kinetic energy is a result of a decrease in turbulence production, along with an increase in turbulent dissipation. Intuitive reasoning and current turbulence models would predict an increase in kinetic energy along with increases in production and dissipation rates as a result of increased mean-flow strain rate. Later in the evolution of the flow, both turbulence production and dissipation increase.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.857658

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Reynolds number effect on the skin friction in separated flows behind a backward-facing step (1995)

Jovic, S. ; Driver, D.

Springer

Experiments in fluids 18 (1995), S. 464-467

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ISSN: 1432-1114

Source: Springer Online Journal Archives 1860-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics

Notes: Conclusions Results from the present study show that the skin-friction coefficient decreases as the Reynolds number,Re h , increases in the following manner, C f ,min=−0.19Re h −1/2. The -1/2 power relationship deduced from the correlationC f,min vs.Re h indicates laminar like behavior which is consistent with the findings of Adams et al. (1984). Clauser's method, which is frequently used for the determination of the wall shear stress, leads to erroneous results when applied to the velocity measurements obtained in the near field of reattaching flows (and many other wall-bounded nonequilibrium flows). Direct measurements of theC f using the LOI technique give higher values than those obtained by the classical techniques. The normalized mean velocity on the wall coordinates violates the universal law-of-the-wall in the near field of reattaching flows.