原子能科学技术Issue(z2)：660-663,4.DOI:10.7538/yzk.2013.47.S1.0660
扩散临界计算中的多重迭代优化技术
Multi-level Iteration Optimization for Diffusive Critical Calculation
摘要
Abstract
In nuclear reactor core neutron diffusion calculation ,there are usually at least three levels of iterations ,namely the fission source iteration ,the multi-group scattering source iteration and the within-group iteration .Unnecessary calculations occur if the inner iterations are converged extremely tight .But the convergence of the outer iteration may be affected if the inner ones are converged insufficiently tight .Thus ,a common scheme suit for most of the problems was proposed in this work to automatically find the optimized settings .The basic idea is to optimize the relative error tolerance of the inner iteration based on the corresponding convergence rate of the outer iteration .Numerical results of a typical thermal neutron reactor core problem and a fast neutron reactor core problem demonstrate the effectiveness of this algorithm in the variational nodal method code NODAL with the Gauss-Seidel left preconditioned multi-group GMRES algorithm . The multi-level iteration optimization scheme reduces the number of multi-group and within-group iterations respectively by a factor of about 1-2 and 5-21 .关键词
核反应堆堆芯计算/多重迭代优化/迭代收敛准则/变分节块法Key words
nuclear reactor core calculation/multi-level iteration optimization/iteration convergence criteria/variational nodal method分类
能源科技引用本文复制引用
李云召,吴宏春,曹良志,郑友琦..扩散临界计算中的多重迭代优化技术[J].原子能科学技术,2013,(z2):660-663,4.基金项目
国家自然科学基金资助项目（11305123）；863计划资助项目（2013AA051402）；中国国家留学基金资助项目 （）
