Department of Aeronautics, Imperial College London, South Kensington, London SW7 2AZ, United Kingdom
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Spectral analysis of near-wall turbulence in channel flow at Reτ=4200 with emphasis on the attached-eddy hypothesis
Published in Physical Review Fluids
Direct numerical simulation data for channel flow at a friction Reynolds number of 4200, generated by Lozano-Durán and Jiménez [J. Fluid Mech. 759, 432 (2014)], are used to examine the properties of near-wall turbulence within subranges of eddy-length scale. Attention is primarily focused on the intermediate layer (mesolayer) covering the logarithm...
On the validity of the quasi-steady-turbulence hypothesis in representing the effects of large scales on small scales in...
Published in Physics of Fluids
The “quasi-steady hypothesis,” as understood in the context of large-scale/small-scale interactions in near-wall turbulence, rests on the assumption that the small scales near the wall react within very short time scales to changes imposed on them by energetic large scales whose length scales differ by at least one order of magnitude and whose ener...
Predicting the response of small-scale near-wall turbulence to large-scale outer motions
Published in Physics of Fluids
A phenomenological model is provided, based on post-processing Direct Numerical Simulation (DNS) data at Reτ = 1020, which permits the near-wall-turbulence statistics to be predicted from a “universal signal,” free from the effects of large-scale motions, in combination with information on the large-scale motions in the outer log-law region. The se...
Skewness-induced asymmetric modulation of small-scale turbulence by large-scale structures
Published in Physics of Fluids
Several recent studies discuss of role of skewness of the turbulent velocity fluctuations in near-wall shear layers, in the context of quantifying the correlation between large-scale motions and amplitude variations of small-scale fluctuations—referred to as “modulation.” The present study is based on the premise that the skewness of the small-scal...
On the influence of outer large-scale structures on near-wall turbulence in channel flow
Published in Physics of Fluids
Direct Numerical Simulation (DNS) data for channel flow at 1025 are used to analyse the interaction between large outer scales in the log-law region – referred to as super-streaks – and the small-scale, streaky, streamwise-velocity fluctuations in the viscosity-affected near-wall layer. The study is inspired by extensive experimental investigations...
