TURBULENCE MODELLING

The turbulence mechanism plays an important part in the mixing processes and momentum transfer of turbulent flow. Two of the most commonly used turbulence models in surface water flow, namely a zero-equation model and the two-equation k-epsilon model, are examined and compared through their application to one laboratory test and one field study. It is demonstrated that turbulent free stress is insignificant in the depth-mean flow momentum balance of a large water body such as in the cases tested in the study. However, the eddy viscosity predicted by the two turbulence models differs significantly, and the k-epsilon model does give more realistic predictions than a zero-equation model. More refined turbulence models, such as the two-equation k-epsilon model, are desired to simulate more accurately the mixing processes of turbulent flow, in which turbulent diffusion is important an is closely related to the eddy viscosity or eddy diffusivity.

  • Supplemental Notes:
    • Instn Civil Engrs Procs, Water Maritime & Energy, v 96 Iss 3, Sept 1992, p 187 [6 p, 10 fig]
  • Authors:
    • Guiyi, L
  • Publication Date: 1992

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00716265
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Feb 28 1996 12:00AM