DNS of Buoyancy Driven Flow Inside a Horizontal Coaxial Cylinder
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Tuesday, December 18, 2012

A direct numerical simulation of the buoyancy driven turbulent flow inside a horizontal annular cavity at higher Rayleigh number, Ra = 1.18x109, and the cylinders ratio of 4.87 has been carried out using the commercial code STAR-CCM+. Kinetic energy budgets have been calculated to verify the accuracy of the unstructured finite volume code on polyhedral cells in Direct Numerical Simulation (DNS) mode. Comparison of DNS results with wall resolved Unsteady RANS (URANS) models shows that the later models are able to capture the general flow features but fail to predict the large unsteadiness and high turbulence levels in the plume. However local heat transfer rates along the inner and outer cylinder walls are on average of acceptable accuracy for engineering purposes.

Author Name: 
Imama Zaidi 1, Yacine Addad2, Dominique Laurence1
Author Company: 
1 The University of Manchester, School of Mechanical, Aerospace and Civil Eng.,2 The University of Khalifa of Science, Technology and Research