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

Kumari, K and Ghosh, S (2017) Invariants of velocity gradient tensor in compressible pipe, nozzle and diffuser flows. In: 10th Int 10th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2017, 6 July 2017 - 9 July 2017, chicago.

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Abstract

Velocity gradient tensor (VGT) analysis of high-order accurate DNS data of compressible pipe, nozzle and diffuser flows is performed. Joint pdfs of second and third invariants conditioned on positive and negative dilatation levels are presented in the viscous layer, buffer layer, log layer and core regions of these flows. For flow regions with positive dilatation there is a preference for unstable flow topology, while regions with negative dilatation show a preference for stable flow topology.

Item Type:	Conference Paper
Publication:	10th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2017
Publisher:	International Symposium on Turbulence and Shear Flow Phenomena, TSFP10
Additional Information:	The copyright for this article belongs to International Symposium on Turbulence and Shear Flow Phenomena, TSFP10.
Keywords:	Flow fields; Incompressible flow; Nozzles; Tensors; Topology; Turbulence, Core region; Flow regions; High-order; Stable flows; Unstable flows; Velocity gradients; Viscous layers, Shear flow
Department/Centre:	Division of Mechanical Sciences > Aerospace Engineering(Formerly Aeronautical Engineering)
Date Deposited:	22 Jul 2022 11:30
Last Modified:	22 Jul 2022 11:30
URI:	https://eprints.iisc.ac.in/id/eprint/74733

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