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Author(s): E.A. Hansen & J. Dalheim
Abstract:
r in steady & oscillatory flow
E.A.
Hansen1 & J.
Dalheim2
1DHI, Hørsholm, Denmark
2DNV Consulting, Høvik, Norway
4.1 Introduction:
The subject of flow around circular cylinders is fundamental in understanding
the flow effects on more complex structures such as offshore structures.
Even for
such a simple problem, the solution is complicated.
Numerous papers and
articles may be found in the literature on the numerical simulation of flow
around circular cylinders, from two-dimensional creeping flow to the simulation
of three-dimensional flow at high Reynolds numbers.
It should be stressed at the outset that the flow field around the cylinder is
rather complex and the success of numerical models has been limited, to say the
least.
While the mathematical formulation is well established, the numerical
difficulties are numerous, partly because of enormous computing demand of the
problem and partly because of shortcomings in the discretization techniques.
Even in steady flow, such as wind around land-based structures, the flow effect
is not very well understood, especially at high Reynolds numbers experienced by
most structures in high winds.
Unlike wind engineering, the forces in offshore
engineering are not simply caused by constant flow, but a combination of
oscillatory flow (waves) and constant flow (current).
In spite of this difference, important information may be obtained from windengineering
studies.
For example, the numerical models can be used for studying
relative effects, such as, how much is the force increased when the cylinder is
...
Pages: 30
Size: 778 kb
Paper DOI: 10.2495/978-1-85312-837-0/04
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