Journal
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
Volume 31, Issue 3, Pages 284-294Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.ijheatfluidflow.2010.02.027
Keywords
Turbulent boundary layer; Forward-facing step; Turbulent structure; Direct numerical simulation
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Funding
- Japan Society for the Promotion of Science (JSPS) [17106003]
- Grants-in-Aid for Scientific Research [17106003] Funding Source: KAKEN
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This paper presents observations and investigations of the detailed turbulent structure of a boundary layer over a forward-facing step. The present DNSs are conducted under conditions with three Reynolds numbers based on step height, or three Reynolds numbers based on momentum thickness so as to investigate the effects of step height and inlet boundary layer thickness. DNS results show the quantitative turbulent statistics and structures of boundary layers over a forward-facing step, where pronounced counter-gradient diffusion phenomena (CDP) are especially observed on the step near the wall. Also, a quadrant analysis is conducted in which the results indicate in detail the turbulence motion around the step. (C) 2010 Elsevier Inc. All rights reserved.
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