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An assessment of the two-layer quasi-laminar theory of relaminarization through recent high-Re accelerated TBL experiments

[+] Author and Article Information
Rajesh Ranjan

Jawaharlal Nehru Centre for Advanced Scientific Research Bangalore, India 560064
rajesh@jncasr.ac.in

Roddam Narasimha

Jawaharlal Nehru Centre for Advanced Scientific Research Bangalore, India 560064
roddam@jncasr.ac.in

1Corresponding author.

ASME doi:10.1115/1.4037059 History: Received January 27, 2017; Revised June 06, 2017

Abstract

The phenomenon of relaminarization is observed in many flow situations, including that of an initially turbulent boundary layer (TBL) subjected to strong favourable pressure gradients (FPG). As several experiments on relaminarizing flows have indicated, TBLs subjected to high pressure gradients do not follow the universal log-law, and (for this and other reasons) the prediction of boundary layer parameters using RANS-type models has not been successful. However, a quasi-laminar theory (QLT; proposed in 1973), based on a two-layer model to explain the later stages of relaminarization, showed good agreement with the experimental data available at that time. These data were mostly at relatively low Re, and hence left the precise role of viscosity undefined. QLT, therefore, could not be assessed at high Re. Recent experiments, however, have provided more comprehensive data and extended the Reynolds number range to nearly 5 x 10 ^3 in momentum thickness. These data provide a basis for a reassessment of QLT, which is revisited here with an improved predictive code. It is demonstrated that even for these high-Re flows subjected to high acceleration, QLT provides good agreement with experimental results, and therefore has the potential to supplement RANS simulations in high FPG regions.

Copyright (c) 2017 by ASME
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