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Numerical Study on the Aerodynamics of an Iced Airfoil With Scale-Resolving SimulationsScale-resolving simulations of the NACA 23012 airfoil with horn ice accretion on the leading edge are conducted using the hybrid Reynolds-averaged Navier–Stokes/large-eddy simulation (hybrid RANS/LES) and wall-modeled large-eddy simulation (WMLES) approaches implemented in the Launch, Ascent, and Vehicle Aerodynamics (LAVA) framework. Aerodynamic results at the Reynolds number of 1.8 million show good comparison with the experimental measurements at different angles of attack from pre-stall to post-stall regimes. The pressure plateaus caused by the flow separation and the recovery of pressure inside the separation bubble around the iced leading edge are well predicted with the scale-resolving simulations when sufficient grid resolution is used around the accreted ice. The unsteadiness of the turbulent flows around the iced airfoil is also examined through the turbulent kinetic energy with the Reynolds normal stress anisotropy. Kelvin–Helmholtz instability (KHI) arises at the shear layer triggered by the upper ice horn and leads to rapid laminar-to-turbulent transition over a large range of angle of attack. With the increase of the angle of attack, the region with high turbulence intensity induced by the unstable shear layer spreads quickly over the entire upper surface of the airfoil. The coherent KHI modes from the upper and lower ice horns are extracted using the spectral proper orthogonal decomposition (SPOD) technique. The SPOD modes extracted from the upper shear layer have large-scale variations in the spanwise direction and low-rank behavior where the energy of the leading SPOD mode at each Strouhal number of the KHI largely represents the total energy when the mode number in the spanwise direction is small.
Document ID
20220018941
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Man Long Wong ORCID
(Science and Technology Corporation (United States) Hampton, Virginia, United States)
Aditya S Ghate
(Science and Technology Corporation (United States) Hampton, Virginia, United States)
Gerrit-Daniel Stich
(Science and Technology Corporation (United States) Hampton, Virginia, United States)
Gaetan K Kenway
(Science and Technology Corporation (United States) Hampton, Virginia, United States)
Cetin C Kiris
(Ames Research Center Mountain View, California, United States)
Date Acquired
December 13, 2022
Publication Date
January 23, 2023
Subject Category
Numerical Analysis
Meeting Information
Meeting: AIAA SciTech Forum and Exposition
Location: National Harbor, MD
Country: US
Start Date: January 23, 2023
End Date: January 27, 2023
Sponsors: American Institute of Aeronautics and Astronautics
Funding Number(s)
WBS: 081876.02.01.50.10.02.02
WBS: 109492.02.01.09.01
Distribution Limits
Public
Copyright
Public Use Permitted.
Technical Review
NASA Peer Committee
Keywords
ARMD
AATT
TTT
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