Author： Vijiapurapu Sowjanya Cui Jie
Publisher： Taylor & Francis Ltd
ISSN： 1521-0634
Source： Numerical Heat Transfer Part A: Applications, Vol.51, Iss.12, 2007-01, pp. : 1137-1165
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Abstract
Flow through a circular pipe with uniformly spaced rib roughness elements is investigated using large eddy simulation (LES). The spacing between the ribs is varied to form three representative types of surface roughness: d-type, intermediate, and k-type. The numerical results are validated against experimental measurements and other numerical data published in the literature. The flows with different types of surface roughness exhibit quite different characteristics in terms of mean flow quantities and coherent eddy structures. Finally, connections are established between the complex three-dimensional turbulent flow field and the classical-concept roughness function for each type of roughness.
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