Computational Models of the Viscous Sublayer and Limiting Behavior of Turbulence Near a Wall.
Abstract
Three computational models of incompressible viscous sublayer turbulence have been developed using the time-dependent Navier-Stokes equations with prescribed velocity boundary conditions at the outer edge of the sublayer. The models attempt in different ways to simulate the highly elongate, quasi-periodic, coherent structures observed experimentally. Comparison of computed results with experiment is good for mean streamwise velocity, mean Reynolds stress, and correlation coefficient; and reasonably good for the three turbulence intensities, skewness and flatness of streamwise velocity and of Reynolds stress. Within a thin layer adjacent to the outer edge, all three models yield anomalously high values for dissipation and streamwise vorticity intensity. Computations using a fine mesh establish the limiting behavior of turbulence quantities very near a wall. Below about 0.3 wall units, the variations with distance from the wall were found to be: linear for streamwise turbulence, spanwise turbulence, and departure of dissipation and streamwise vorticity from their wall values; second power for turbulence normal to the wall; third power for Reynolds stress; and a constant non-zero value for the correlation coefficient.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1984
- Accession Number
- ADA151198
Entities
People
- D. R. Chapman
- G. D. Kuhn
Organizations
- Nielsen Engineering & Research (United States)