Axisymmetric bluff-body flow: A vortex solver for thin shells
A method which is capable of solving the axisymmetric flow field over bluff bodies consisting of thin shells such as disks, partial spheres, rings, and other such shapes is presented in this report. The body may be made up of several shells whose edges are separated by gaps. The body may be moved axially according to arbitrary velocity time histories. In addition, the surfaces may posses axial and radial degrees of flexibility such that points on the surfaces may be allowed to move relative to each other according to some specified function of time. The surfaces may be either porous or impervious. The present solution technique is based on the axisymmetric vorticity transport equation. Physically, this technique simulates the generation of vorticity at body surfaces in the form of discrete ring vortices which are subsequently diffused and convected into the boundary layers and wake of the body. Relatively large numbers of vortices (1000 or more) are required to obtain good simulations. Since the direct calculation of perturbations from large numbers of ring vortices is computationally intensive, a fast multipole method was used to greatly reduce computer processing time. Several example calculations are presented for disks, disks with holes, hemispheres, and vented hemispheres. These results are compared with steady and unsteady experimental data. 45 refs.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 10156455
- Report Number(s):
- SAND--91-2760; ON: DE92016748
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
450000
661300
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AERODYNAMICS
ANALYTICAL SOLUTION
BOUNDARY CONDITIONS
COMPUTER CALCULATIONS
DRAG
FLUID MECHANICS
MESH GENERATION
MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
OTHER ASPECTS OF PHYSICAL SCIENCE
PARACHUTES
SHELLS
VELOCITY
VORTICES