Definition of Turbulent Boundary-Layer with Entropy Concept

Rui Zhao, Jili Rong, Haibo Li, Fang Ren

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)

Abstract

The relationship between the entropy increment and the viscosity dissipation in turbulent boundary-layer is systematically investigated. Through theoretical analysis and direct numerical simulation (DNS), an entropy function fs is proposed to distinguish the turbulent boundary-layer from the external flow. This approach is proved to be reliable after comparing its performance in the following complex flows, namely, low-speed airfoil flows with different wall temperature, supersonic cavity-ramp flow dominated by the combination of free-shear layer, larger recirculation and shocks, and the hypersonic flow past an aeroplane configuration. Moreover, fs is deduced from the point of energy, independent of any particular turbulent quantities. That is, this entropy concept could be utilized by other engineering applications related with turbulent boundary-layer, such as turbulence modelling transition prediction and engineering thermal protection.

Original languageEnglish
Article number02005
JournalMATEC Web of Conferences
Volume77
DOIs
Publication statusPublished - 3 Oct 2016
Event3rd International Conference on Mechanics and Mechatronics Research, ICMMR 2016 - Chongqing, China
Duration: 15 Jun 201617 Jun 2016

Fingerprint

Dive into the research topics of 'Definition of Turbulent Boundary-Layer with Entropy Concept'. Together they form a unique fingerprint.

Cite this