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An assessment of viscous effects in computational simulation of benign and burst vortex flows on generic fighter wind-tunnel models using TEAM codeVortex flows on a twin-tail and a single-tail modular transonic vortex interaction (MTVI) model, representative of a generic fighter configuration, are computationally simulated in this study using the Three-dimensional Euler/Navier-Stokes Aerodynamic Method (TEAM). The primary objective is to provide an assessment of viscous effects on benign (10 deg angle of attack) and burst (35 deg angle of attack) vortex flow solutions. This study was conducted in support of a NASA project aimed at assessing the viability of using Euler technology to predict aerodynamic characteristics of aircraft configurations at moderate-to-high angles of attack in a preliminary design environment. The TEAM code solves the Euler and Reynolds-average Navier-Stokes equations on patched multiblock structured grids. Its algorithm is based on a cell-centered finite-volume formulation with multistage time-stepping scheme. Viscous effects are assessed by comparing the computed inviscid and viscous solutions with each other and experimental data. Also, results of Euler solution sensitivity to grid density and numerical dissipation are presented for the twin-tail model. The results show that proper accounting of viscous effects is necessary for detailed design and optimization but Euler solutions can provide meaningful guidelines for preliminary design of flight vehicles which exhibit vortex flows in parts of their flight envelope.
Document ID
19950016768
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Kinard, Tim A. (Lockheed Aeronautical Systems Co. Marietta, GA, United States)
Harris, Brenda W. (Lockheed Aeronautical Systems Co. Marietta, GA, United States)
Raj, Pradeep (Lockheed Aeronautical Systems Co. Marietta, GA, United States)
Date Acquired
September 6, 2013
Publication Date
March 1, 1995
Publication Information
Publisher: NASA
Subject Category
Aerodynamics
Report/Patent Number
NAS 1.26:4650
NASA-CR-4650
Accession Number
95N23185
Funding Number(s)
CONTRACT_GRANT: NAS1-19000
PROJECT: RTOP 505-68-30-03
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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