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V.M.Vovk, V.O.Gorban, I.M.Gorban, H.P.Sokolovskyi Analysis of free-surface influence on bluff body hydrodynamic characteristics |
Applied hydromechanics, Vol. 14 (86) ¹ 1, (2012) |
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The salient features of the interaction between a
free-surface flow and a body at small Froude numbers are
investigated by both numerically and experimentally. A circular
cylinder and rectangular prisms are considered. The flow fields and
body hydrodynamic characteristics are shown to depend on the gap
width between the body and the boundary. When the body approaches to
the free surface, it's drag and non-stationary characteristics, such
as amplitude of lift force and Strouhal number, rise in uniform
manner. The stationary lift force also arises: it is the deepening
force for the circular cylinder and it may be up-directed for
rectangular bodies. There is the critical gap in the system when the
body drag has the maximum value. The results obtained demonstrate
the growth of hydrodynamic loads on engineering structures that are
operated near a free surface.
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KEY WORDS: circular cylinder, free-surface |
| TEXT LANGUAGE: Ukrainian |