High-order accurate implicit Large Eddy Simulations of flow over a NACA0021 aerofoil in deep stall

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Title: High-order accurate implicit Large Eddy Simulations of flow over a NACA0021 aerofoil in deep stall
Authors: Park, JS
Witherden, FD
Vincent, PE
Item Type: Journal Article
Abstract: In this study the GPU-accelerated solver PyFR is used to simu- late flow over a NACA0021 aerofoil in deep stall at a Reynolds number of 270, 000 using the high-order Flux Reconstruction (FR) approach. Wall-resolved Implicit Large Eddy Simulations (ILES) are undertaken on unstructured hexahedral meshes at fourth- and fifth-order accuracy in space. It was found that either modal filtering, or anti-aliasing via an approximate L2 projection, is required in order to stabilise simu- lations. Time-span averaged pressure coefficient distributions on the aerofoil, and associated lift and drag coefficients, are seen to converge towards experimental data as the simulation setup is made more realis- tic by increasing the aerofoil span. Indeed, the lift and drag coefficients obtained by fifth-order ILES with anti-aliasing via an approximate L 2 projection agree better with experimental data than a wide range of previous studies. Stabilisation via modal filtering, however, is found to reduce solution accuracy. Finally, performance of various PyFR simulations is compared, and it is found that fifth-order simulations with anti-aliasing via an L2 projection are the most efficient. Results indicate that high-order FR schemes with anti-aliasing via an L2 projection are a good candidate for underpinning accurate wall-resolved ILES of separated, turbulent flows over complex engineering geometries.
Issue Date: 1-Nov-2017
Date of Acceptance: 20-Mar-2017
URI: http://hdl.handle.net/10044/1/45762
ISSN: 1533-385X
Publisher: American Institute of Aeronautics and Astronautics
Journal / Book Title: AIAA Journal
Copyright Statement: This paper is embargoed until publication.
Sponsor/Funder: Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Engineering & Physical Science Research Council (EPSRC)
Funder's Grant Number: EP/L000407/1
EP/K027379/1
EP/M50676X/1
Keywords: Aerospace & Aeronautics
0901 Aerospace Engineering
0913 Mechanical Engineering
Publication Status: Accepted
Embargo Date: publication subject to indefinite embargo
Appears in Collections:Faculty of Engineering
Aeronautics



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