Title: POD study on the mechanism of turbulent drag reduction and heat transfer reduction based on Direct Numerical Simulation

Authors: Yi Wang, Bo Yu, Xuan Wu, Jinjia Wei, Fengchen Li, Yasuo Kawaguchi

Addresses: Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, China University of Petroleum-Beijing, Beijing 102249, China. ' Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, China University of Petroleum-Beijing, Beijing 102249, China. ' Beijing Key Laboratory of Urban Oil and Gas Distribution Technology, China University of Petroleum-Beijing, Beijing 102249, China. ' State Key Laboratory of Multiphase Flow in Power Engineering, Xi'an Jiaotong University, Xi'an 710049, China. ' School of Energy Science and Engineering, Harbin Institute of Technology, Harbin 150001, China. ' Department of Mechanical Engineering, Tokyo University of Science, Yamazaki 2641, Noda, Chiba 278-8510, Japan

Abstract: Direct Numerical Simulations (DNSs) have been performed for turbulent channel flows of Newtonian fluid and drag-reducing fluid with heat transfer. Main coherent structures in the drag-reducing flow and heat transfer were extracted from the DNS database by Proper Orthogonal Decomposition (POD) method. The mechanisms of turbulent drag reduction and heat transfer reduction were studied through the analyses of the coherent structures and energy distribution reflected by different POD eigenmodes.

Keywords: POD; DNS; drag reduction; heat transfer reduction; computational fluid dynamics; CFD; turbulent drag; direct numerical simulation; turbulent channel flows; Newtonian fluids; proper orthogonal decomposition.

DOI: 10.1504/PCFD.2011.041014

Progress in Computational Fluid Dynamics, An International Journal, 2011 Vol.11 No.3/4, pp.149 - 159

Published online: 28 Jun 2011 *

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