Special features of the pressure fluctuation field structures in the vicinity of bluff bodies (cylinders)

Resumo

The fields of turbulent near-wall pressure fluctuations on a surface in a flow are experimentally investigated in the presence of cylinders located in the proximity of the surface. It is shown that the main characteristics of the pressure fluctuation fields can be essentially transformed in the case of nonzero distance (gap) between the cylinder and the surface in a flow, namely, the spectral levels increase over the entire frequency range, a narrow-band frequency maximum is formed, and the spatial distribution of the pressure fluctuation intensity changes. The dependence of the main parameters of the pressure fluctuation fields is presented and a weak influence of the boundary layer thickness is shown.