Accession Number:

ADA010627

Title:

Atmospheric Modeling: Development of Vortex Structures in Buoyant and Shear Flows

Descriptive Note:

Final rept. 1 Aug-31 Dec 1972

Corporate Author:

PHYSICAL DYNAMICS INC DETROIT MI

Personal Author(s):

• Thomson, J. Alex
• Meng, J. C. S.

Report Date:

1973-12-01

Pagination or Media Count:

144.0

Abstract:

Particle-in-cell PIC calculations representing a vortex by the particles were done by Rosenhead in 1930 in his study of vortex streets by Birkoff and Fisher in 1959, and by Hama and Burke in 1960. Abernathy and Kronauer made a detailed study of the Karman vortex street in 1962 using the same method. Hockney 1962 was the first one to incorporate the advantages of the fast Fourier transform FFT to the PIC method in order to handle very large numbers of particles. Chorin 1973 proposed a new version of the discrete vortex method where vortices are needed only to satisfy the no-slip boundary conditions. The numerical study presented herein combines the concepts of the PIC method, Greens function, and the FFT methods.

Descriptors:

• *ATMOSPHERE MODELS
• *ATMOSPHERIC MOTION
• *SHEAR PROPERTIES
• *VORTICES
• BUOYANCY
• EQUATIONS OF MOTION
• FINITE DIFFERENCE THEORY
• FLOW FIELDS
• FOURIER TRANSFORMATION
• INSTABILITY
• INTERACTIONS
• MATHEMATICAL MODELS
• NUMERICAL METHODS AND PROCEDURES
• SIMULATION
• WAKE

Subject Categories:

• Meteorology
• Fluid Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE