Forced Three Dimensional Flow Structures.
WEST VIRGINIA UNIV MORGANTOWN
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Forced unsteadiness in a two-dimensional jet using fluidically imposed excitation in the jet nozzle has been studied experimentally. A second method of introducing unsteadiness using a rotating cam-shaped rotor has also been studied in the jet flow as well as in flows over rearward facing ramps and backsteps. Results show that the separation and reattachment conditions can be controlled in this manner and that jet and wake spreading characteristics can be modified using these techniques. Two techniques for identification of rotational vortex structures have been developed. Their first uses phase information in the discrete Fourier transform of the field while the second involves spatial behavior of local orthogonal decomposition components. Keywords Unsteady flow Separated flow Vortex.
- Fluid Mechanics