Computational unsteady flow dynamics: oscillating flow about a circular cylinder.
Loading...
Authors
Gordon, David R.
Subjects
Numerical
Navier-Stokes
Oscillating Flow
Co-existing Flow
Harmonically Oscillating Flow
Navier-Stokes
Oscillating Flow
Co-existing Flow
Harmonically Oscillating Flow
Advisors
Sarpkaya, T.
Date of Issue
1991-12
Date
Publisher
Monterey, California. Naval Postgraduate School
Language
en_US
Abstract
The numerical experiments, carried out through the use of the vorticitystream
function equations and their finite difference form, on co-existing
flows (sinusoidal or non-sinusoidal oscillation plus steady mean flow) are described.
A third-order in time, second-order in space, three-level predictorcorrector
finite-difference scheme has been used. The Poisson equation for
the stream function was solved by a Fast Poisson Solver based on the High
Order Difference Approximation with Identity Expansion (HODIE) and the
Fast Fourier Transform (FFT) methods provided by the IMSL mathematical library.
The results have revealed, for the first time, the existence of a very interesting
wake comprised of three rows of heterostrophic vortices at certain
Keulegan-Carpenter numbers and relative current ratios. The existence of
such a street has been vindicated by physical experiments.
Type
Thesis
Description
Series/Report No
Department
Mechanical Engineering
Organization
Naval Postgraduate School
Identifiers
NPS Report Number
Sponsors
Funder
Format
99 p.;28 cm.
Citation
Distribution Statement
Approved for public release; distribution is unlimited.