NDLI: Large Eddy Simulation of Round Impinging Jets With Large Stand-Off Distance

Content Provider	The American Society of Mechanical Engineers (ASME) Digital Collection
Author	Shademan, Mehrdad Roussinova, Vesselina Barron, Ron Balachandar, Ram
Copyright Year	2014
Abstract	Large Eddy Simulation (LES) has been carried out to study the flow of a turbulent impinging jet with large nozzle height-to-diameter ratio. The dynamic Smagorinsky model was used to simulate the subgrid-scale stresses. The jet exit Reynolds number is 28,000. The study presents a detailed evaluation of the flow characteristics of an impinging jet with nozzle height of 20 diameters above the plate. Results of the mean normalized centerline velocity and wall shear stress show good agreement with previous experiments. Analysis of the flow field shows that vortical structures generated due to the Kelvin-Helmholtz instabilities in the shear flow close to the nozzle undergo break down or merging when moving towards the plate. Unlike impinging jets with small stand-off distance where the ring-like vortices keep their interconnected shape upon reaching the plate, no sign of interconnection was observed on the plate for this large stand-off distance. A large deflection of the jet axis was observed for this type of impinging jet when compared to the cases with small nozzle height-to-diameter ratios.
File Format	PDF
ISBN	9780791849545
DOI	10.1115/IMECE2014-37194
Volume Number	Volume 7: Fluids Engineering Systems and Technologies
Conference Proceedings	ASME 2014 International Mechanical Engineering Congress and Exposition
Language	English
Publisher Date	2014-11-14
Publisher Place	Montreal, Quebec, Canada
Access Restriction	Subscribed
Subject Keyword	Turbulence Large eddy simulation Deflection Reynolds number Shear flow Vortices Shear stress Jets Nozzles Shapes Flow (dynamics) Stress
Content Type	Text
Resource Type	Article

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