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Numerical Simulation of Single-Stream Jets from a Serrated Nozzle

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Abstract

Hybrid large-eddy type simulations for cold jet flows from a serrated nozzle are performed at an acoustic Mach number Ma ac  = 0.9 and Re = 1.03×106. Since the solver being used tends towards having dissipative qualities, the subgrid scale (SGS) model is omitted, giving a numerical type LES (NLES) or implicit LES (ILES) reminiscent procedure. To overcome near wall streak resolution problems a near wall RANS (Reynolds averaged Navier-Stokes) model is smoothly blended to the LES making a hybrid RANS-ILES. The geometric complexity of the serrated nozzle is fully considered without simplification or emulation. An improved but still modest hexahedral multi-block grid with circa 20 million grid points (with respect to 12.5 million in Xia et al., Int J Heat Fluid Flow 30:1067–1079, 2009) is used. Despite the modest grid size, encouraging and improved results are obtained. Directly resolved mean and second-order fluctuating quantities along the jet centerline and in the jet shear layer compare favorably with measurements. The radiated far-field sound predicted using the Ffowcs Williams and Hawkings (FW-H) surface integral method shows good agreement with the measurements in directivity and sound spectra.

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Authors and Affiliations

  1. Thermo-Fluid Mechanics Research Centre, University of Sussex, Brighton, BN1 9QT, UK

    Hao Xia

  2. Whittle Laboratory, University of Cambridge, 1 JJ Thomson Ave., Cambridge, CB3 0DY, UK

    Paul G. Tucker

Authors
  1. Hao Xia
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  2. Paul G. Tucker
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Correspondence to Hao Xia.

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Xia, H., Tucker, P.G. Numerical Simulation of Single-Stream Jets from a Serrated Nozzle. Flow Turbulence Combust 88, 3–18 (2012). https://doi.org/10.1007/s10494-011-9377-5

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  • DOI: https://doi.org/10.1007/s10494-011-9377-5

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