Journal
INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW
Volume 59, Issue -, Pages 125-130Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.ijheatfluidflow.2016.03.007
Keywords
Compressible; Turbulent; Turbulent-nonturbulent interface
Categories
Funding
- Erasmus Mundus WILLPower program
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Analyses of invariants of the velocity gradient tensor (VGT) at the turbulent-nonturbulent interface of temporal plane mixing layers reveal a new type of joint pdf. When compressibility effects are small, fluid packets from the surrounding nonturbulent freestream enter the turbulent region in sheet-like zones; the VGT has one positive (compression) and two negative (expansion) eigenvalues. When compressibility effects are significant, in some parts of the turbulent-nonturbulent interface two of the eigenvalues are positive and one is negative. The implied local flow is that of streamtubes surrounded by vortex arcs (partial rings). The new topology occurs less frequently than the sheet-like regions. (C) 2016 Elsevier Inc. All rights reserved.
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