Optimization for the Numerical Solution Method Aiming at Recirculation Phenomena Caused by the Flow Blockage Scenarios

Abstract

Flow blockage accidents may cause fluid backflow or recirculation, and lead to changes in flow characteristics. In the nuclear reactor design, the compact fuel rod design of the reactor core can easily cause flow blockage due to corrosion or impurities, which can not be ignored. In this work, a numerical solution method for predicting the thermal-hydraulic parameters under this issue is proposed and an optimization method is also given with the main targets to speed up the running speed. Current results are validated by experiments, which have proved the accuracy of this numerical solution method. Besides, the optimization method is also quantified by comparing it with the serial-version code, which shows that dozens of times speedup can be achieved on the large-scale fuel assembly.