FUNDAMENTAL STUDY ON THE NEAR-WALL BEHAVIOUR OF THE LOW-REYNOLDS-NUMBER K-EPSILON TURBULENCE MODEL

The validity of six k-epsilon models was investigated by comparing the results of each model for the fully developed turbulent channel flow to the results of the direct numerical simulation (DNS) by Kim, Moin and Moser (1987). Most models show good agreement with DNS for the mean velocity profile, while they have disagreements for the profile of the turbulence energy k. The near-wall behaviour of the viscous diffusion term and dissipation term in every model except Kasagi's, have a qualitative discrepancy from the DNS results. The failure in the prediction of the k profile may be due to this fact. The pressure-turbulence diffusion terms in k and epsilon equations are inconsistent with the near-wall behaviour which are derived theoretically. A new model is presented which modifies the pressure-turbulence diffusion term and these defects are reduced to more closely satisfy the theoretical behaviour. These modifications revise the behaviour of the viscous diffusion term and dissipation term to give better agreement with the DNS results. In addition, these modifications effect the heat transfer calculation, especially for high Prandtl number fluids.

  • Supplemental Notes:
    • Papers of Ship Research Inst, v 28 n 6, Nov 1991, p 1 [21 p, 27 ref, 2 tab, 13 fig]
  • Authors:
    • Harumi, K
  • Publication Date: 1991

Language

  • Japanese

Subject/Index Terms

Filing Info

  • Accession Number: 00716251
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Feb 28 1996 12:00AM