Computation of Sound Generated by Viscous Flow Over a Circular Cylinder
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Computation of Sound Generated by Viscous Flow Over a Circular Cylinder

Computation of Sound Generated by Viscous Flow Over a Circular Cylinder


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About the Book

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 10 cylinder diameters. The two-dimensional unsteady flow field 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. Cox, Jared S. and Rumsey, Christopher L. and Brentner, Kenneth S. and Younis, Bassam A. Langley Research Center NASA-TM-110339, NAS 1.15:110339 RTOP 533-31-21-04...


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Product Details
  • ISBN-13: 9781725582583
  • Publisher: Createspace Independent Publishing Platform
  • Publisher Imprint: Createspace Independent Publishing Platform
  • Height: 279 mm
  • No of Pages: 28
  • Spine Width: 2 mm
  • Width: 216 mm
  • ISBN-10: 1725582589
  • Publisher Date: 16 Aug 2018
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Weight: 91 gr


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