An accelerated synchronized forward-adjoint approach in method of characteristics neutron transport solution

Abstract

In this paper, an accelerated version of synchronized forward-adjoint solution of method of characteristic is developed for 2D geometry using the CMFD method. The forward and the adjoint are applied in perturbation theory estimates of neutron multiplication. In this work, a practical use of MOC has been presented by simultaneously solving the forward-adjoint transport problems in a code named, AFAMOC (Accelerated Forward-Adjoint method of characteristics). AFAMOC utilizes capability of MOC in using same ray tracing data between forward and backward solution. This decreases the memory requirement. The further saving in time is provided by CMFD. To solve forward-adjoint CMFD, an approach for collapsing of the group constant in energy and space is presented. This approach provides the correct calculation of forward-adjoint spectrum and eigenvalue for CMFD.The numerical study includes 2D C5G7 benchmark which is done using an Intel corei7 6700 processor. Results show that a noticeable speedup is given.