Development and Validation of CMFD Acceleration Calculation Module for 2D MOC

Several acceleration methods for 2D method of characteristics (MOC) are encoded in DRAGON code. However, the coarse mesh finite difference (CMFD) acceleration method with high speedup is not applied. In order to accelerate the 2D MOC calculation in DRAGON with higher speedup, the CMFD acceleration calculation module was developed and its stabilization was also studied. The C5G7-2D benchmark was used to testify the CMFD acceleration module. Numerical results demonstrate that the CMFD acceleration calculation module is more efficient than the other acceleration calculation modules encoded in the original DRAGON code, and is more stable than the OpenMOC code.