Hairpin vortex formation, a case study for unsteady visualization.
To better understand the vortex dynamics of coherent structures in turbulent and transitional boundary layers, we consider direct numerical simulation of the interaction between a flat-plateboundary-layer flow and an isolated hemispherical roughness element. Of principal interest is the evolution of hairpin vortices that form an interlacing pattern in the wake of the hemisphere, lift away from the wall, and are stretched by the shearing action of the boundary layer. Using animations of unsteady three-dimensional representations of this flow, produced by the vtk toolkit and enhanced to operate in a CAVE virtual environment, we identify and study several key features in the evolution of this complex vortex topology not previously observed in other visualization formats.
- Research Organization:
- Argonne National Lab., IL (US)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 11928
- Report Number(s):
- ANL/MCS/CP-99772; TRN: AH200119%%124
- Resource Relation:
- Conference: Cray User's Group Meeting, Minneapolis, MN (US), 05/24/1999--05/28/1999; Other Information: PBD: 10 Aug 1999
- Country of Publication:
- United States
- Language:
- English
Similar Records
Analysis of the motions and effects of hairpin vortices
Image processing of hydrogen-bubble flow visualization for quantitative evaluation of hairpin-type vortices as a flow structure of turbulent boundary layers