User's Guide for TWOHEX: a Code Package for Two-Dimensional, Neutral-Particle Transport in Equilateral Triangular Meshes

摘要

TWOHEX solves the two-dimensional multigroup transport equation on an equilateral triangular mesh in the x,y plane. Both regular and adjoint, inhomogeneous (fixed source) and homogeneous problems are solved. Three problem domains are treated by TWOHEX. The whole core domain is a 60 degrees parallelogram with vacuum boundary conditions on each face. The third core domain is a 120 degrees parallelogram with two vacuum and two rotational boundary conditions. The sixth core domain is a 60 degrees parallelogram with two vacuum and two rotational boundary conditions. General anisotropic scattering is allowed and an anisotropic inhomogeneous source may be input as cell averages. (ERA citation 10:010590)