NUMERICAL CALCULATIONS OF TRANSITIONAL FLOW OVER FLAT PLATE IN TURBULENT NON-UNIFORM FLOWS

The behaviour of the boundary layer over a flat plate in a non- uniform incoming flow was simulated using low Reynolds number -epsilon models of Launder and Sharma and a transition model. Mean velocity profiles and skin-frictions on the flat plate were also measured in the wake generated by a circular cylinder at the upstream. The computational Preston Method (CPM) proposed by Nitsche et al was used to measure the skin-friction coefficients in the study. The Launder and Sharma model predicts earlier start and short transition length than the PTM model, and Chien's model also shows earlier start of transition and damped variation. These trends are generally the same with those of the uniform flow. The PTM transition model based on the low Reynolds number -epsilon of Launder and Sharma reasonably predicts skin-frictions on a flat plate during transition. However, more extensive calibrations of the PTM transition model is needed. The CPM method is verified as a useful tool to investigate skin-friction over the transitional boundary layer with reasonable accuracy. The simple construction and instrumentation for the technique are appreciated. Measured skin- friction coefficient gradually changes from the leading edge to the downstream. Transition length was considerable longer than in the uniform flow.

  • Supplemental Notes:
    • 6th Intl Conf on Numerical Ship Hydrodynamics; 2-5 Aug 1993; Iowa, USA. Sponsored by US National Research Council et al. Procs. Publ by National Academy Press, USA, 1994. Session 6, p 649 [11 p, 15 ref, 26 fig]
  • Authors:
    • Kang, S H
    • Choi, M R
    • Jeon, W P
  • Publication Date: 1994

Language

  • English

Subject/Index Terms

Filing Info

  • Accession Number: 00716081
  • Record Type: Publication
  • Source Agency: British Maritime Technology
  • Files: TRIS
  • Created Date: Feb 28 1996 12:00AM