Invariants of velocity gradient tensor in supersonic turbulent pipe, nozzle, and diffuser flows

Kumari, Komal and Mahapatra, Susila and Ghosh, Somnath and Mathew, Joseph (2018) Invariants of velocity gradient tensor in supersonic turbulent pipe, nozzle, and diffuser flows. In: PHYSICS OF FLUIDS, 30 (1).

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Abstract

Velocity gradient tensor (VGT) analysis of high-order accurate direct numerical simulation data of supersonic pipe, nozzle, and diffuser flows at computationally moderate Reynolds numbers is performed. Joint probability density functions of second and third invariants of the VGT conditioned on positive and negative dilatation levels are presented in the near-wall viscous layer, buffer layer, log layer, and core region of these flows. For flow regions with positive dilatation, there is a preference for unstable flow topologies, while regions with negative dilatation show a preference for stable flow topologies. Published by AIP Publishing.

Item Type:	Journal Article
Publication:	PHYSICS OF FLUIDS
Additional Information:	Copy right for this article belong to the AMER INST PHYSICS, 1305 WALT WHITMAN RD, STE 300, MELVILLE, NY 11747-4501 USA
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	02 Mar 2018 14:56
Last Modified:	25 Aug 2022 05:40
URI:	https://eprints.iisc.ac.in/id/eprint/59055

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