@article{d8d11aff84d04dddb2e63174f908f16c,
title = "Improving low-frequency characteristics of recycling/rescaling inflow turbulence generation",
abstract = "For the study of turbulent flows with low-frequency dynamics (e.g. shock-wave/boundary-layer interactions), it is desirable that the inflow turbulence does not contaminate the solution with spurious spatiotemporal correlations introduced by the mechanism of inflow turbulence generation. To investigate the creation and mitigation of these adverse low-frequency effects, large-eddy simulation of a Mach 2.28 boundary layer over an adiabatic flat plate is carried out using a typical recycling/rescaling procedure. Spurious temporal autocorrelations and energy spectral peaks are observed associated with the recycling frequency and its harmonics. Comparisons are made with common {"}synthetic{"} turbulence-generation techniques, and improvements to the standard recycling/rescaling procedure are suggested to substantially reduce or eliminate the inherent low-frequency contamination. It is found that by applying a nonconstant reflection or translation operation to the recycled turbulence plane at randomly-distributed time intervals, one is able to maintain realistic turbulence without low-frequency contamination.",
author = "Brandon Morgan and Johan Larsson and Soshi Kawai and Lele, {Sanjiva K.}",
note = "Funding Information: This research was made with government support under and awarded by Department of Defense, Air Force Office of Scientific Research, National Defense Science and Engineering Graduate Fellowship, 32 CFR 168a. We gratefully acknowledge partial support from the Air Force Office of Scientific Research Multidisciplinary University Research Initiative, NASA Hypersonics Program, and the Department of Energy Predictive Science Academic Alliance Program. Computer time has been provided by NASA Advanced Supercomputing at NASA Ames Research Center in Moffett Field, California, and by the High Performance Computing Center at Lawrence Livermore National Laboratory in Livermore, California. We would also like to recognize M. R. Visbal at the Air Force Research Laboratory for providing the FDL3DI code that has been extended and used in the present study. Interactions with David Dawson from the Department of Aeronautics and Astronautics and Sergei Chumakov from the Center for Turbulence Research at Stanford University have also been invaluable, and the first author would like express his gratitude for the assistance.",
year = "2011",
month = mar,
doi = "10.2514/1.J050705",
language = "English",
volume = "49",
pages = "582--597",
journal = "AIAA Journal",
issn = "0001-1452",
publisher = "American Institute of Aeronautics and Astronautics Inc. (AIAA)",
number = "3",
}