Use of direct numerical simulation to study the effect of Prandtl number on temperature fields

摘要

The influence of Prandtl number on statistical parameters characterizing turbulent transport and the spatial variations of the mean-square of the temperature fluctuations, θ~2, is described. The system considered is fully developed flow in a channel for which the bottom wall is heated and the top wall is cooled. Results from direct numerical solutions of the Euler balance equations for Pr = 0.3, 1, 3, 10 and Lagrangian studies, in a DNS, of the dispersion of heat markers from wall sources for Pr = 0.1-2400 are used.