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Toward Cost-Effective Boundary Layer Transition Simulation with LES

[+] Author and Article Information
Solkeun Jee

School of Mechanical Engineering, Gwangju Institute of Science and Technology (GIST) 123 Cheomdan-gwagi-ro, Buk-gu, Gwangju, 61005, South Korea
sjee@gist.ac.kr

Jongwook Joo

United Technologies Research Center (UTRC) 411 Silver Lane, East Hartford, Connecticut, 06108, USA
jooj@utrc.utc.com

Ray-Sing Lin

United Technologies Research Center (UTRC) 411 Silver Lane, East Hartford, Connecticut, 06108, USA
linr@utrc.utc.com

1Corresponding author.

ASME doi:10.1115/1.4039865 History: Received November 26, 2017; Revised March 06, 2018

Abstract

An efficient large-eddy simulation (LES) approach is investigated for laminar-to-turbulent transition in boundary layers. This approach incorporates the boundary-layer stability theory. Primary instability and sub-harmonic perturbations determined by the boundary-layer stability theory are assigned as forcing at the inlet of the LES computational domain. This LES approach reproduces the spatial development of instabilities in the boundary layer, as observed in wind tunnel experiments. Detailed linear growth and nonlinear interactions that lead to the H-type breakdown are well captured and compared well to previous direct-numerical simulations. Requirements in the spatial resolution in the transition region are investigated with connections to the resolution in turbulent boundary layers. It is shown that the sub-grid model used in this study is apparently dormant in the overall transitional region, allowing the right level of the growth of small-amplitude instabilities and their nonlinear interactions. The sub-grid model becomes active near the end of the transition where the length scales of high-order instabilities become smaller in size compared to the given grid resolution. Current results demonstrate the benefit of the boundary-layer forcing method for the computational cost reduction.

United Technologies Corporation
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