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Near-Wall Turbulence Modeling Without Wall Distance

[+] Author Affiliations
M. M. Rahman, T. Siikonen

Helsinki University of Technology, Finland

Paper No. PVP2004-3134, pp. 177-184; 8 pages
doi:10.1115/PVP2004-3134
From:
  • ASME/JSME 2004 Pressure Vessels and Piping Conference
  • Computational Technologies for Fluid/Thermal/Structural/Chemical Systems With Industrial Applications, Volume 2
  • San Diego, California, USA, July 25–29, 2004
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4686-5
  • Copyright © 2004 by ASME

abstract

A low-Reynolds number k-ε model is proposed in which the anisotropic production in near-wall regions is accounted for substantially by modifying the model constants Cε(1,2) and adding cross-diffusion terms in the ε equation. Hence, it reduces the kinetic energy and length scale magnitudes to improve prediction of adverse pressure gradient flows, involving flow separation and reattachment. Unlike the conventional k-ε model, it requires no wall function/distance parameter that bridges the near-wall integration. The model coefficients/functions depend nonlinearly on both the strain-rate and vorticity invariants. The model is validated against a few flow cases, yielding predictions in good agreement with the direct numerical simulation (DNS) and experimental data.

Copyright © 2004 by ASME

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