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Direct numerical simulation of a transitional rectangular jet

โœ Scribed by B. Rembold; N.A. Adams; L. Kleiser

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
260 KB
Volume
23
Category
Article
ISSN
0142-727X

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โœฆ Synopsis

A well-resolved numerical simulation of a Mach 0.5 jet exiting from a rectangular shaped nozzle with an aspect ratio of 5 into a quiescent ambient was performed at a Reynolds number of 2000 based on the narrow side of the nozzle. The transition process was triggered by the most unstable symmetric linear eigenmode of a parallel laminar jet profile at the nozzle exit. We observe a shearlayer roll-up for the laminar jet and subsequently a very rapid transition to small-scale turbulence. The asymmetry of the velocity profile with respect to the jet axis leads to a rapid spreading of the jet along its minor axis within the so-called characteristic region as expected from experimental observations for similar configurations.

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