TY - GEN
T1 - COMPUTATION OF VORTEX SHEDDING AND RADIATED SOUND FOR A CIRCULAR CYLINDER
AU - Cox, Jared S.
AU - Rumsey, Christopher L.
AU - Brentner, Kenneth S.
AU - Younis, Bassam A.
N1 - Funding Information:
The authors wish to thank R. Biedron of NASA Langley Research Center for his helpful discussion and advice during the course of this investigation. Research done by the first author is a portion of what will be included in a Master of Science Thesis with The George Washington University. The first author wishes to acknowledge support from the NASA Langley Research Center, Aeroacoustics Breinch, for this research.
Publisher Copyright:
© 1997 American Society of Mechanical Engineers (ASME). All rights reserved.
PY - 1997
Y1 - 1997
N2 - The Lighthill acoustic analogy approach combined with Reynolds-averaged Navier Stokes is used to predict the sound generated by unsteady viscous flow past a circular cylinder assuming a correlation length of ten cylinder diameters. The two-dimensional unsteady flow fleld is computed using two Navier-Stokes codes at a low Mach number over a range of Reynolds numbers from 100 to 5 million. Both laminar flow as well as turbulent flow with a variety of eddy viscosity turbulence models are employed. Mean drag and Strouhal number are examined, and trends similar to experiments are observed. Computing the noise within the Reynolds number regime where transition to turbulence occurs near the separation point is problematic: laminar flow exhibits chaotic behavior and turbulent flow exhibits strong dependence on the turbulence model employed. Comparisons of far-field noise with experiment at a Reynolds number of 90,000, therefore, vary significantly, depending on the turbulence model. At a high Reynolds number outside this regime, three different turbulence models yield self-consistent results.
AB - The Lighthill acoustic analogy approach combined with Reynolds-averaged Navier Stokes is used to predict the sound generated by unsteady viscous flow past a circular cylinder assuming a correlation length of ten cylinder diameters. The two-dimensional unsteady flow fleld is computed using two Navier-Stokes codes at a low Mach number over a range of Reynolds numbers from 100 to 5 million. Both laminar flow as well as turbulent flow with a variety of eddy viscosity turbulence models are employed. Mean drag and Strouhal number are examined, and trends similar to experiments are observed. Computing the noise within the Reynolds number regime where transition to turbulence occurs near the separation point is problematic: laminar flow exhibits chaotic behavior and turbulent flow exhibits strong dependence on the turbulence model employed. Comparisons of far-field noise with experiment at a Reynolds number of 90,000, therefore, vary significantly, depending on the turbulence model. At a high Reynolds number outside this regime, three different turbulence models yield self-consistent results.
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U2 - 10.1115/IMECE1997-0088
DO - 10.1115/IMECE1997-0088
M3 - Conference contribution
AN - SCOPUS:10844245892
T3 - ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
SP - 447
EP - 454
BT - 4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise
PB - American Society of Mechanical Engineers (ASME)
T2 - ASME 1997 International Mechanical Engineering Congress and Exposition, IMECE 1997 - 4th International Symposium on Fluid-Structure Interactions, Aeroelasticity, Flow-Induced Vibration and Noise
Y2 - 16 November 1997 through 21 November 1997
ER -