The influence of pipe length on thermal statistics computed from DNS of turbulent heat transfer
S Saha, C Chin, HM Blackburn, ASH Ooi
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW | ELSEVIER SCIENCE INC | Published : 2011
We present results from direct numerical simulation of turbulent heat transfer in pipe flow at a bulk flow Reynolds number of 5000 and Prandtl numbers ranging from 0.025 to 2.0 in order to examine the effect of streamwise pipe length (πδ≡ πD/2 ≤ L≤ 12 πδ) on the convergence of thermal turbulence statistics. Various lower and higher order thermal statistics such as mean temperature, rms of fluctuating temperature, turbulent heat fluxes, two-point auto and cross-correlations, skewness and flatness were computed and it is found that the value of L required for convergence of the statistics depends on the Prandtl number: larger Prandtl numbers requires comparatively shorter pipe length for conve..View full abstract
This research was supported by a Victorian Life Sciences Computation Initiative (VLSCI) grant on its Peak Computing Facility at the University of Melbourne, an initiative of the Victorian Government. We would also like to gratefully acknowledge Victorian Partnership for Advanced Computing (VPAC) for initially providing computational resources.