文章基本信息

标题：Towards an efficient multiphysics model for nuclear reactor dynamics
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作者：Obaidurrahman, K. ; Gaikwad, Avinash J.
期刊名称：Nuclear Technology and Radiation Protection
印刷版ISSN：1451-3994
出版年度：2015
卷号：30
期号：3
页码：165-174
DOI：10.2298/NTRP1503165O
出版社：VINČA Institute of Nuclear Sciences
摘要：Availability of fast computer resources nowadays has facilitated more in-depth modeling of complex engineering systems which involve strong multiphysics interactions. This multiphysics modeling is an important necessity in nuclear reactor safety studies where efforts are being made worldwide to combine the knowledge from all associated disciplines at one place to accomplish the most realistic simulation of involved phenomenon. On these lines coupled modeling of nuclear reactor neutron kinetics, fuel heat transfer and coolant transport is a regular practice nowadays for transient analysis of reactor core. However optimization between modeling accuracy and computational economy has always been a challenging task to ensure the adequate degree of reliability in such extensive numerical exercises. Complex reactor core modeling involves estimation of evolving 3-D core thermal state, which in turn demands an expensive multichannel based detailed core thermal hydraulics model. A novel approach of power weighted coupling between core neutronics and thermal hydraulics presented in this work aims to reduce the bulk of core thermal calculations in core dynamics modeling to a significant extent without compromising accuracy of computation. Coupled core model has been validated against a series of international benchmarks. Accuracy and computational efficiency of the proposed multiphysics model has been demonstrated by analyzing a reactivity initiated transient.
关键词：multiphysics modeling; TRIKIN; space-time kinetics; core thermal hydraulics; coupled core dynamics; power weighted coupling