中子输运计算的角度多重网格加速和L-W外推加速技术

Angular Multigrid Acceleration Method and Lyusternik-Wagner Extrapolation Acceleration Technique for Numerical Calculation of Neutron Transport Equation

把角度多重网格(ANMG)加速方法及Lyusternik-Wagner(L-W)外推加速技术应用于三维多群离散纵标三角形节块稳态中子输运数值计算程序(DNTR)。一系列输运问题的数值结果表明:ANMG加速方法具有较好的加速效果,且对强各向异性散射和强散射比问题有很强的适应性。在ANMG加速方法的基础上增加L-W外推加速技术后,可以使整体加速效果更加显著。

The angular multigrid（ANMG） acceleration method and the Lyusternik-Wagner extrapolation acceleration technique are applied to accelerate the neutron transport equation solver DNTR,which was developed by using SN nodal method in triangular-z meshes.Some numerical results demonstrate that the ANMG acceleration method applied to DNTR is effective,even in strong anisotropic scattering and high scattering ratio situations,especially combined with the Lyusternik-Wagner extrapolation acceleration technique.