Large Eddy Simulations of Flow and Heat Transfer in Rotating Ribbed Duct Flows

[+] Author and Article Information
Mayank Tyagi, Sumanta Acharya

Mechanical Engineering Department Louisiana State University Baton Rouge, LA 70803

J. Heat Transfer 127(5), 486-498 (May 25, 2005) (13 pages) doi:10.1115/1.1861924 History: Received April 03, 2004; Revised December 08, 2004; Online May 25, 2005
Copyright © 2005 by ASME
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Typical turbine blade internal cooling configuration (Wagner et al. 2, Roclawski et al. 21)
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Schematic of the computational domain
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Nusselt number distribution on the ribbed (a) leading wall and (b) trailing wall
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(a) Three-dimensional energy spectrum of the flow field. (b) Flow rate versus time.
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Time-averaged velocity vectors and details of flow field near the ribs at the Y/D=0.5
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Time sequence of streamwise vorticity (left) and temperature field (right) at Z/D=1.0. Temperature field: red is 1 and blue is 0. Arrows show locations of counter-rotating vortex pairs.
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Time sequence of vorticity dynamics and temperature field on cross-sectional plane at Y/D=0.5. Spanwise vorticity (left) and temperature field (right). Arrows on the snapshots track vortices and entrainment interface of scalar field.
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Influence of vortical structures on the near wall heat transfer in rotating ribbed duct. (Note: range of nondimensional heat flux on leading and trailing wall is different in this figure).
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(a) Temperature signals around probe stations just above the walls between the ribs along the centerplane (Y/D=0.5). (b) Corresponding probability distribution function.
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Vorticity dynamics and temperature field over trailing wall at X/D=0.125 (top row) and leading wall at X/D=0.975 (bottom row), wall-normal vorticity (left) and temperature field (right)
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Coherent structures over the trailing wall—three time instances
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Coherent structures over the leading wall—one time instance
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Energy distribution in the POD modes calculated from 200 snapshots
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Velocity components of the first two POD modes (top row: mode 1, bottom row: mode 2) extracted from 200 snapshots for single module flow fields




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