Boltzmann-Fokker-Planck calculations using standard discrete-ordinates codes
The Boltzmann-Fokker-Planck (BFP) equation can be used to describe both neutral and charged-particle transport. Over the past several years, the author and several collaborators have developed methods for representing Fokker-Planck operators with standard multigroup-Legendre cross-section data. When these data are input to a standard S/sub n/ code such as ONETRAN, the code actually solves the Boltzmann-Fokker-Planck equation rather than the Boltzmann equation. This is achieved wihout any modification to the S/sub n/ codes. Because BFP calculations can be more demanding from a numerical viewpoint than standard neutronics calculations, we have found it useful to implement new quadrature methods ad convergence acceleration methods in the standard discrete-ordinates code, ONETRAN. We discuss our BFP cross-section representation techniques, our improved quadrature and acceleration techniques, and present results from BFP coupled electron-photon transport calculations performed with ONETRAN. 19 refs., 7 figs.
- Research Organization:
- Los Alamos National Lab., NM (USA)
- DOE Contract Number:
- W-7405-ENG-36
- OSTI ID:
- 5603054
- Report Number(s):
- LA-UR-88-229; CONF-8702113-2; ON: DE88005393
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
Shielding Calculations & Experiments
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BOLTZMANN EQUATION
CALCULATION METHODS
CHARGED-PARTICLE TRANSPORT
COMPUTER CODES
CROSS SECTIONS
DIFFERENTIAL EQUATIONS
ELASTIC SCATTERING
EQUATIONS
FOKKER-PLANCK EQUATION
FUNCTIONS
LEGENDRE POLYNOMIALS
MATHEMATICAL OPERATORS
NEUTRAL-PARTICLE TRANSPORT
O CODES
PARTIAL DIFFERENTIAL EQUATIONS
POLYNOMIALS
RADIATION TRANSPORT
SCATTERING