Discrete-vortex simulation of pulsating flow on a turbulent leading-edge separation bubble
- Author
- Kiya, Masaru
- Published
- JAN 1, 1992.
- Physical Description
- 1 electronic document
- Additional Creators
- Sung, Hyung Jin and Rhim, Jae Wook
Online Version
- hdl.handle.net , Connect to this object online.
- Restrictions on Access
- Unclassified, Unlimited, Publicly available.
Free-to-read Unrestricted online access - Summary
- Studies are made of the turbulent separation bubble in a two-dimensional semi-infinite blunt plate aligned to a uniform free stream with a pulsating component. The discrete-vortex method is applied to simulate this flow situation because this approach is effective for representing the unsteady motions of the turbulent shear layer and the effect of viscosity near the solid surface. The numerical simulation provides reasonable predictions when compared with the experimental results. A particular frequency with a minimum reattachment is related to the drag reduction. The most effective frequency is dependent on the amplified shedding frequency. The turbulent flow structure is scrutinized. This includes the time-mean and fluctuations of the velocity and the surface pressure, together with correlations between the fluctuating components. A comparison between the pulsating flow and the non-pulsating flow at the particular frequency of the minimum reattachment length of the separation bubble suggests that the large-scale vortical structure is associated with the shedding frequency and the flow instabilities.
- Other Subject(s)
- Collection
- NASA Technical Reports Server (NTRS) Collection.
- Note
- Document ID: 19930018268.
Accession ID: 93N27457.
California State Univ., The Fifth Symposium on Numerical and Physical Aspects of Aerodynamic Flows; 9 p. - Terms of Use and Reproduction
- No Copyright.
View MARC record | catkey: 15669808