Onset of shear-layer instability at the interface of parallel Couette flows

Teja, Kalluri M.; Narasimhamurthy, Vagesh D.; Andersson, Helge I.; Pettersen, Bjørnar

doi:10.1016/j.ijheatfluidflow.2021.108786

Cited by 6 publications

(8 citation statements)

References 25 publications

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“…Previous studies on pCf reported the critical Reynolds number to be approximately 500. 22,23 This was also confirmed by Teja et al 20 Thus, the Reynolds number combination ðRe h ; Re l Þ ¼ ð500; 100Þ represents the co-flow of turbulent and laminar pCfs. Teja et al 20 presented the kinematic analysis of adjacent turbulent/non-turbulent flows for different Reynolds number combinations (Re h , Re l ) and Reynolds number ratios ðr ¼ Re h =Re l Þ.…”

Section: Introductionsupporting

confidence: 70%

“…22,23 This was also confirmed by Teja et al 20 Thus, the Reynolds number combination ðRe h ; Re l Þ ¼ ð500; 100Þ represents the co-flow of turbulent and laminar pCfs. Teja et al 20 presented the kinematic analysis of adjacent turbulent/non-turbulent flows for different Reynolds number combinations (Re h , Re l ) and Reynolds number ratios ðr ¼ Re h =Re l Þ. However, several dynamical aspects like the effect of one flow over the other, energy budget analysis [24][25][26] of the flow system, vorticity dynamics, 24,27,28 and topology 29 still remain unexplored.…”

Section: Introductionsupporting

confidence: 70%

“…Most of the studies are limited to only the open flows like jets and wakes, and the study of such adjacent turbulent/non-turbulent systems remains obscure in semi-confined and confined flows. Except the preliminary studies by Narasimhamurthy et al 18,19 and Teja et al, 20,21 no significant work has been done in this class of flows. Previous studies on pCf reported the critical Reynolds number to be approximately 500.…”

Section: Introductionmentioning

confidence: 92%

“…This article is aimed toward extending the study of Teja et al 20 using the same data to analyze further, studying the dynamics of unstable co-flowing plane Couette flow for a particular Reynolds number combination ðRe h ; Re l Þ ¼ ð500; 100Þ. A qualitative visualization of the base flow (defined in Teja et al 20 ) and co-flow can be seen in Fig. 6.…”

Section: Introductionmentioning

confidence: 97%

“…However, several dynamical aspects like the effect of one flow over the other, energy budget analysis [24][25][26] of the flow system, vorticity dynamics, 24,27,28 and topology 29 still remain unexplored. This article is aimed toward extending the study of Teja et al 20 using the same data to analyze further, studying the dynamics of unstable co-flowing plane Couette flow for a particular Reynolds number combination ðRe h ; Re l Þ ¼ ð500; 100Þ. A qualitative visualization of the base flow (defined in Teja et al 20 ) and co-flow can be seen in Fig.…”

Section: Introductionmentioning

confidence: 98%

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Shear-layer dynamics at the interface of parallel Couette flows

Kalluri

Narasimhamurthy

2022

Physics of Fluids

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The current article aims to make a detailed analysis of co-flowing plane Couette flows. Particularly, the variation of flow quantities from the turbulent to non-turbulent region is studied. While the enstrophy exhibits a sharp jump, the other quantities (e.g., mean velocity, Reynolds normal stress, and kinetic energy) show a continuous variation across the interface. The budget analysis of Reynolds normal stresses reveal that different terms play their role in turbulence transportation, depending on the Reynolds normal stress under study. The terms production, diffusion, and redistribution play an important role in streamwise Reynolds stress (u'u'). In the spanwise Reynolds stress (v'v'), the diffusion terms play a significant role. In the wall-normal Reynolds stress (w'w') only the redistribution term is significant. The influence of one flow over other in the co-flow state was observed through the additional mean velocity and Reynolds normal stress found in the system compared to a standard plane Couette flow (pCf). Comparing the co-flow system with conventional pCf system, the former exhibits greater vorticity, vortex stretching, and kinetic energy. A detailed analysis on the geometry and topology of flow structures was studied using flow invariants.

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