OPTIMIZATION OF THE SUBSPACE ITERATION METHOD FOR THE LAMBDA MODES DETERMINATION OF A NUCLEAR POWER REACTOR

摘要

In this paper, we propose different alternative approaches to optimize the subspace iteration method which obtains the dominant lambda-modes of a nuclear power reactor. We present a variational acceleration for the iterative process, a coarse grain parallelizatization approach, and a multistep algorithm to choose efficient initial estimations for the subspace iteration method. We have tested the efficiency of the developed algorithms with a 3D realistic problem, corresponding to a static configuration of the reactor Ringhals I. [References: 14]