Performance of RNG Turbulence Modelling for Turbulent Forced Convective Heat Transfer in Ducts

Masoud Rokni, Bengt Sundén

Research output: Contribution to journalJournal articleResearchpeer-review


This investigation concerns numerical calculation of turbulent forced convective heat transfer and fluid flow in straight ducts using the RNG (Re-Normalized Group) turbulence method. A computational method has been developed to predict the turbulent Reynolds stresses and turbulent heat fluxes in ducts with different turbulence models. The turbulent Reynolds stresses and other turbulent flow quantities are predicted with the RNG k-e model and the RNG non-linear k-e model of Speziale. The turbulent heat fluxes are modeled by the simple eddy diffusivity (SED) concept, GGDH and WET methods. Two wall functions are used, one for the velocity field and one for the temperature field. All the models arc implemented for an arbitrary three dimensional duct. Fully developed condition is achieved by imposing cyclic boundary conditions in the main flow direction. The numerical approach is based on the finite volume technique with a non-staggered grid arrangement. The pressure-velocity coupling is handled by using the SIMPLEC-algorithm. The convective terms are treated by the QUICK, scheme while the diffusive terms are handled by the central-difference scheme. The hybrid scheme is used for solving the k and e equations. The overall comparison between the models is presented in terms of friction factor and Nusselt number. The secondary flow generation is also of major concern.
Keyword: RNG; turbulent flow; secondary motions; convective; heal transfer; ducts; GGDH; WET
Original languageEnglish
JournalInternational Journal of Computational Fluid Dynamics
Issue number3 & 4
Pages (from-to)351-362
Publication statusPublished - 1998
Externally publishedYes


  • RNG
  • Turbulent flow
  • Secondary motions
  • Convective
  • Heat transfer
  • Ducts
  • GGDH
  • WET


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