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作者:Jonathan Gustafsson , William K. George
来源:[J].Physics Letters A(IF 1.766), 2011, Vol.375 (30), pp.2850-2853
摘要:Abstract(#br)The form E ( k , t ) ≃ C m k m in the limit as k → 0 and where C m is independent of k is examined under the assumption that the turbulence is homogeneous and the three-dimensional energy spectrum function is continuous. By using fractional derivatives together ...
作者:Stephan Gamard , William K. George
来源:[J].Flow, Turbulence and Combustion(IF 1.274), 2000, Vol.63 (1-4), pp.443-477
摘要:Abstract(#br)A Near-Asymptotics analysis of the turbulence energy spectrum is presented that accounts for the effects of finite Reynolds number recently reported by Mydlarski and Warhaft [21]. From dimensional and physical considerations (following Kolmogorov and von Karman)...
作者:Preben Buchhave , Clara M. Velte , William K. George
来源:[J].Experiments in Fluids(IF 1.572), 2014, Vol.55 (2), pp.1-8
摘要:Abstract(#br)We investigate power spectra of a randomly sampled stationary stochastic signal, e.g., a spatial component of a turbulent velocity. We extend the methods of previous authors that basically assumed point or delta function sampling by including features characteristic ...
作者:Clara Marika Velte , William K. George , Preben Buchhave
来源:[J].Experiments in Fluids(IF 1.572), 2014, Vol.55 (3), pp.1-20
摘要:Abstract(#br)The estimationof power spectra from LDA data provides signal processing challenges for fluid dynamicists for several reasons: acquisition is dictated by randomly arriving particles, the registered particle velocities tend to be biased toward higher values, and the si...
作者:Clara M. Velte , Preben Buchhave , William K. George
来源:[J].Experiments in Fluids(IF 1.572), 2014, Vol.55 (11), pp.1-10
摘要:Abstract(#br)We present velocity power spectra computed by the so-called direct method from burst-type laser Doppler anemometer (LDA) data, both measured in a turbulent round jet and generated in a computer. Using today’s powerful computers, we have been able to study more p...
作者:WILLIAM D. GEORGE , WILLIAM K. GEORGE
来源:[J].1963, Vol.21 (11), pp.350-351
作者:William K. George
来源:[J].Philosophical Transactions: Mathematical, Physical and Engineering Sciences(IF 2.891), 2007, Vol.365 (1852), pp.789-806
摘要:The history and theory supporting the idea of a universal log law for turbulent wall-bounded flows are briefly reviewed. The original idea of justifying a log law from a constant Reynolds stress layer argument is found to be deficient. By contrast, it is argued that the loga...
作者:William K. George , Murat Tutkun
来源:[J].Philosophical Transactions: Mathematical, Physical and Engineering Sciences(IF 2.891), 2009, Vol.367 (1899), pp.2839-2847
摘要:This paper briefly reviews some of the fundamental ideas of turbulence as they relate to large eddy simulation (LES). Of special interest is how our thinking about the so-called 'spectral gap' has evolved over the past decade, and what this evolution implies for LES applications.
作者:Peter B. V. Johansson , William K. George
来源:[J].Second Symposium on Turbulence and Shear Flow Phenomena, 2001, pp.323-328
摘要:Equilibrium similarity considerations are applied to the axisymmetric turbulent wake. Two solutions are found; one for infinite Reynolds number, one for small Reynolds number, and both dependent on the upstream conditions. Neither agrees particularly well with the data. For both ...

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