Application of non-linear k–ω model to a turbulent flow inside a sharp U-bend |
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Authors: | B Song R S Amano |
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Affiliation: | (1) Department of Mechanical Engineering, University of Wisconsin-Milwaukee, Milwaukee, WI 53211, US |
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Abstract: | Simulation of the complex flow inside a sharp U-bend needs both refined turbulence models and higher order numerical discretization
schemes. In the present study, a non-linear low-Reynolds number (low-Re) k–ω model including the cubic terms was employed to predict the turbulent flow through a square cross-sectioned U-bend with
a sharp curvature, R
C/D = 0.65. In the turbulence model employed for the present study, the cubic terms are incorporated to represent the effect
of extra strain-rates such as streamline curvature and three-dimensionality on both turbulence normal and shear stresses.
In order to accurately predict such complex flowfields, a higher-order bounded interpolation scheme (Song et al., 1999) has
been used to discretize all the transport equations. The calculated results by using both the non-linear k–ω model and the linear low-Reynolds number k–ɛ model (Launder and Sharma, 1974) have been compared with experimental data. It is shown that the present model produces
satisfactory predictions of the flow development inside the sharp U-bend and well captures the characteristics of the turbulence
anisotropy within the duct core region and wall sub-layer. |
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Keywords: | |
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