Studies of Vortex Interactions
Abstract
Work accomplished under this contract includes: the following: (1) The X-Y Tow Tank Facility was designed and constructed, and (2) Experimental techniques developed for flow visualisation in the Tow Tank included improvement in laser-induced fluorescence and particle-streakline techniques. It was found that, for an oscillating body, it is the acceleration phase of the body's motion in each half cycle that synchronises the vortex formation, and thereby influences both the magnitude and phase of the forces on the body (which are of central importance to flow-induced vibration). It was demonstrated how flows with truly two-dimensional parallel shedding can be achieved, which can now be directly compared with the many 2-D numerical simulations presently being carried out. It was shown that the transition to three-dimensionality in the cylinder wake involves two stages, each of which is associated with a discontinuous change in the mode of vortex formation (corresponding with different scales of streamwise vorticity).
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 26, 1990
- Accession Number
- ADA223864
Entities
People
- Anatol Roshko
- Theodore Von Karman
Organizations
- California Institute of Technology