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High-Reynolds number transitional flow simulation via parabolized stability equations with an adaptive RANS solver

TitleHigh-Reynolds number transitional flow simulation via parabolized stability equations with an adaptive RANS solver
Publication TypeJournal Articles
Year of Publication2019
AuthorsHalila, GLO, Chen, G, Shi, Y, Fidkowski, KJ, Martins, JRRA, de Mendonça, MTeixeira
JournalAerospace Science and Technology
Volume91
Start Page321
Date Published05/2019
Type of ArticleFull article
ISSN1270-9638
Keywordsaerodynamics, mesh adaptation, Parabolized Stability Equations (PSE), Transition to turbulence
Abstract

The accurate prediction of transition is relevant for aerodynamic analysis and design
applications. Extending the laminar flow region over airframes is a potential way to
reduce the skin friction drag, which in turn reduces fuel burn and greenhouse gas emis-
sions. This paper introduces a numerical framework that includes the modeling of
transition effects for high Reynolds number flows in a high-fidelity, Reynolds–averaged
Navier–Stokes (RANS) aerodynamic design framework. The CFD solver uses a discon-
tinuous Galerkin (DG) finite element approach and includes goal-oriented adaptation.
The Spalart–Allmaras (SA) turbulence model is used for the closure of the governing
equations. In the flow stability analysis, the nonlocal, nonparallel effects that charac-
terize boundary layers are accounted for by using the parabolized stability equations
(PSE). Transition onset is obtained through an e N method based on the PSE compu-
tations, while a smooth intermittency function includes the transition region length.
Numerical results for the NLF(1)-0416 airfoil present good agreement with experimen-
tal data, improving the computations when compared to fully-turbulent ones.

DOI10.1016/j.ast.2019.05.018
Citation KeyHalila2019b