User's guide for TWODANT: a code package for two-dimensional, diffusion-accelerated, neutral-particle transport. Revision 1

Technical Report · Mon Oct 01 00:00:00 EDT 1984

DOI:https://doi.org/10.2172/5985401· OSTI ID:5985401

Alcouffe, R E; Brinkley, F W; Marr, D R; O'Dell, R D

TWODANT solves the two-dimensional multigroup transport equation in x-y, r-z, and r-theta geometries. Both regular and adjoint, inhomogeneous (fixed source and homogeneous (k-effective and eigenvalue search)) problems subject to vacuum, reflective, periodic, white, or inhomogeneous boundary flux conditions are solved. General anisotropic scattering is allowed and anisotropic inhomogeneous sources are permitted. TWODANT numerically solves the two-dimensional multigroup form of the neutral-particle, steady-state Boltzmann transport equation. The discrete-ordinates form of approximation is used for treating the angular variation of the particle distribution and the diamond-difference scheme is used for space-angle discretization. Negative fluxes are eliminated by a local set-to-zero-and-correct algorithm. A standard inner (within-group) iteration, outer (energy-group-dependent source) iteration technique is used. Both inner and outer iterations are accelerated using the diffusion synthetic acceleration method. The diffusion solver uses the multigrid method and Chebychev acceleration of the fission source.

• Research Organization: Los Alamos National Lab., NM (USA)
• Sponsoring Organization: Not Available; USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 5985401
• Report Number(s): LA-10049-M-Rev.1; ON: DE85005335
• Country of Publication: United States
• Language: English

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