The improved odCMFD method based on the 2D/1D Fourier analysis

The coarse mesh finite difference (CMFD) method is widely used to accelerate neutron transport calculation. The Fourier analysis shows that approximately three times of 1D inner iteration can improve the convergence and efficiency in CMFD accelerated two-dimension/one-dimension (2D/1D) neutronic transport simulation. To further enhance the convergence and efficiency of the 2D/1D neutronic transport simulation, the improved odCMFD method is studied based on the 2D/1D Fourier analysis, and the scattering ratio correction term is implemented in the improved odCMFD method. The results of the VERA benchmark and the SPEPT whole-core problem indicate that the improved odCMFD method has better convergence than the traditional odCMFD method, which is of great significance to further improve the computational efficiency of the three-dimension (3D) full core transport calculation.