Effects of rotation on flow in an asymmetric rib-roughened duct: LES study |
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| Institution: | 1. Dipartimento di Ingegneria Meccanica e Aerospaziale, Sapienza Università di Roma, Italy;2. Delft University of Technology, The Netherlands;3. Novosibirsk State University, Russia;1. Centre for Atomic and Molecular Physics, Manipal University, Manipal 576 104, India;2. UM-DAE Centre for Excellence in Basic Sciences, Kalina Campus, Mumbai 400 098, India;3. Tata Institute of Fundamental Research, 1 Homi Bhabha Road, Mumbai 400 005, India;1. Engineering Simulation and Aerospace Computing (ESAC), School of Mechanical Engineering, Northwestern Polytechnical University, Xi''an, Shaanxi 710072, China;2. Division of Heat Transfer, Department of Energy Sciences, Lund University, P.O. Box 118, SE-22100 Lund, Sweden;1. Global Core Research Center for Ships and Offshore Plants, Pusan National University, Jang Jeon 2-Dong, Geum Jeong Gu, Busan 609-735, Republic of Korea;2. School of Mechanical Engineering, Pusan National University, Jang Jeon 2-Dong, Geum Jeong Gu, Busan 609-735, Republic of Korea;1. Mechanical Engineering Department, Technocrats Institute of Technology – Excellence, Bhopal, MP 462021, India;2. Mechanical Engineering Department, Maulana Azad National Institute of Technology, Bhopal, MP 462051, India;1. Mechanical Engineering Department, Lakshmi Narain College of Technology, Bhopal, MP 462022, India;2. Mechanical Engineering Department, Rewa Engineering College, Rewa, MP 486002, India;3. Mechanical Engineering Department, Manipal University Jaipur, Jaipur, Rajasthan 303007, India |
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| Abstract: | We report on large-eddy simulations (LES) of fully-developed asymmetric flow in a duct of a rectangular cross-section in which square-sectioned, equally-spaced ribs oriented perpendicular to the flow direction, were mounted on one of the walls. The configuration mimics a passage of internal cooling of a gas-turbine blade. The duct flow at a Reynolds number Re = 15,000 (based on hydraulic diameter Dh and bulk flow velocity U0) was subjected to clock-wise (stabilising) and anti-clock-wise (destabilising) orthogonal rotation at a moderate rotational number Ro = ΩDh/U0 = 0.3, where Ω is the angular velocity. The LES results reproduced well the available experimental results of Coletti et al. (2011) (in the mid-plane adjacent to the ribbed wall) and provided insight into the whole duct complementing the reference PIV measurement. We analyzed the effects of stabilising and destabilising rotation on the flow, vortical structures and turbulence statistics by comparison with the non-rotating case. The analysis includes the identification of depth of penetration of the rib-effects into the bulk flow, influence of flow three-dimensionality and the role of secondary motions, all shown to be strongly affected by the rotation and its direction. |
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| Keywords: | LES Stabilising and destabilising rotation Rib-roughened duct |
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