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Modeling of vortex-induced oscillations based on indicial response approachThe indicial response approach, a modeling approach originally used for studying nonlinear problems in flight dynamics is applied to the study of vortex-induced oscillations phenomena. The indicial response of the velocity field is derived for the problem studied with emphasis on physical postulates involved. A full account of fluid dynamics effects is taken by considering the incompressible Navier-Stokes equations. The theory is applied to the particular case of flow past a cylinder in periodically forced motion to derive some salient features. The indicial response approach is shown to be equivalent to a currently popular approach based on the use of the amplitude equation. Jump and hysteresis phenomena that experiments indicate occur within the lock-in regime (where the velocity field oscillates at the forcing frequency) are captured by the approach.
Document ID
19900012420
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Truong, Khiem Van (Eloret Corp. Sunnyvale, CA, United States)
Date Acquired
September 6, 2013
Publication Date
May 15, 1990
Subject Category
Aerodynamics
Report/Patent Number
NASA-CR-186560
NAS 1.26:186560
Accession Number
90N21736
Funding Number(s)
CONTRACT_GRANT: NCC2-634
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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