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Analysis and mitigation of numerical dissipation in inviscid and viscid computation of vortex-dominated flowsThe conservative unsteady Euler equations for the flow relative motion in the moving frame of reference are used to solve for the steady and unsteady flows around sharp-edged delta wings. The resulting equations are solved by using an implicit approximately-factored finite volume scheme. Implicit second-order and explicit second- and fourth-order dissipations are added to the scheme. The boundary conditions are explicitly satisfied. The grid is generated by locally using a modified Joukowski transformation in cross flow planes at the grid chord stations. The computational applications cover a steady flow around a delta wing whose results serve as the initial conditions for the unsteady flow around a pitching delta wing about a large angle of attack. The steady results are compared with the experimental data and the periodic solution is achieved within the third cycle of oscillation.
Document ID
19900016965
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Kandil, Osama A. (Old Dominion Univ. Norfolk, VA, United States)
Date Acquired
September 6, 2013
Publication Date
August 1, 1990
Subject Category
Fluid Mechanics And Heat Transfer
Report/Patent Number
NAS 1.26:186887
NASA-CR-186887
Accession Number
90N26281
Funding Number(s)
CONTRACT_GRANT: NAG1-846
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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