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Vagesh D Narasimhamurthy
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Vagesh D Narasimhamurthy
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Vagesh D Narasimhamurthy
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Narasimhamurthy, V. D.
Narasimhamurthy, Vagesh D.
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2 results
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- PublicationDNS of an Oscillating Shear Layer Between Two Parallel Couette Flows(01-01-2021)
;Manohar Teja, KalluriA non-planar mixing layer observed between parallel Couette flows by Narasimhamurthy et al. (Phys Rev E 85:036,302, 2012) is considered. Direct numerical simulation is chosen, and simulations are run in order to determine the critical Reynolds number at which the interface between the co-flowing laminar and non-laminar flow becomes unstable exhibiting a meandering motion. The necessary conditions required to trigger the shear-layer instability were also discussed. Different combinations of Reynolds numbers are chosen keeping the Reynolds number ratio between the laminar and non-laminar flows as constant. Preliminary results indicate that the onset of instability occurs, and a meandering motion is observed at the interface when Reynolds number for the non-laminar flow corresponds to 650. - PublicationEvaluation of Outflow Boundary Conditions in DNS of Turbulent Jet Flows(01-01-2022)
;Charles, PrinceChoice of an outflow boundary condition (BC) for a turbulent free-jet flow simulation in a finite domain is non trivial, where neighbouring boundaries and their BCs may also have an influence. In this work, three different outflow BCs, Neumann BC with back-flow limiter, convective BC and Chapman BC (which is based on Orlanski scheme), were considered. A planar turbulent jet at Re= 4000 was simulated using direct numerical simulation (DNS), where an entrainment BC is applied on the lateral sides of the jet. The outflow BC proposed by Orlanski in an explicit form, which was later re-formulated by Chapman, was found to be a good choice in the present problem, where entrainment effects are also present.