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Small scale entrainment characteristics in high Reynolds number jets and wakes

DOI: 10.1615/THMT-18.140
pages 183-187

Marco Zecchetto
LAETA, IDMEC, Instituto Superior Tecnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisbon, Portugal

Tiago S. Silva
LAETA, IDMEC, Instituto Superior Tecnico, Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001 Lisbon, Portugal

Carlos B. da Silva
Department of Mechanical Engineering (DEM) IDMEC/IST, Technical University of Lisbon Av. Rovisco Pais, 1049-001 Lisbon, Portugal

Abstrakt

The characteristics of the turbulent/non-turbulent interface (TNTI) that occurs at the edges of free shear layers such as mixing layers, jets and wakes, and also in boundary layers, is analysed through new high resolution direct numerical simulations (DNS) of planar turbulent jets and wakes (PJET and PWAKE). It is shown that provided the Reynolds number is above a certain threshold Reλ > 200, thickness of the viscous dominated sublayer, known as viscous superlayer (VSL - δν) as that of the entire turbulent/non-turbulent interface layer (TNTI - δω) both scale with the Kolmogorov micro-scale. The differences and similarities between the TNTIs from jets and wakes, as well how these affect the dynamics of the nearby vorticity, is discussed.

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