Experimental/numerical mapping and analysis of the nearfield flow around a cylinder in planar oscillatory farfield flow
- Univ. of Texas, Austin, TX (United States). Offshore Technology Research Center
- Exxon Production Research Co., Houston, TX (United States)
This work is an ongoing experimental/numerical investigation of the fluid-structure interaction case of a fixed circular cylinder in oscillatory flow at Keulegan-Carpenter numbers (KC) in the inertia-drag flow regime and at subcritical Reynolds numbers (Re). The experiments are run in a computer controlled water tunnel which generates a planar harmonically or randomly oscillating flow past a rigid circular cylinder. The numerical simulation of the flow is based on a finite-element method for the unsteady incompressible Navier-Stokes equations in two dimensions. Vector plot mappings of the near flow velocity field at KC=20 at various phases in the oscillation cycle are presented and compared to flow visualization studies in the same water tunnel. These mappings, as well as similar mappings at KC=10 and 15, presented in a previous paper by Sibetheros, et al. (1994), are based on ``modal phase averages`` of measured velocity data, that distinguish between ``positive`` and ``negative`` flow modes, i.e. dominant vortex shedding from the top and bottom of the cylinder, respectively. The flow at KC=20 exhibits vortex shedding and motion patterns which are distinct from the ones at KC=10 and 15. Nondimensionalized near wake u-velocity profiles at the three KC numbers have similar shapes, whereas the corresponding v-velocity profiles have distinct shapes. Numerical results are in overall agreement with experimental results at KC=10 and to a lesser degree at KC=15.
- OSTI ID:
- 260415
- Report Number(s):
- CONF-950604--; ISBN 1-880653-19-2
- Country of Publication:
- United States
- Language:
- English
Similar Records
An experimental/numerical study of the hydrodynamics of the near flow of a cylinder in planar oscillatory farfield flow
Near wake models for the hydrodynamics forces on a cylinder in periodic flow