Nuclear Engineering and Technology

Korean Nuclear Society (한국원자력학회)
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Extension of the NEAMS workbench to parallel sensitivity and uncertainty analysis of thermal hydraulic parameters using Dakota and Nek5000

  • Delchini, Marc-Olivier G. (Reactor and Nuclear Systems Division, Oak Ridge National Laboratory) ;
  • Swiler, Laura P. (Center for Computing Research, Sandia National Laboratories) ;
  • Lefebvre, Robert A. (Reactor and Nuclear Systems Division, Oak Ridge National Laboratory)
  • Received : 2020.11.05
  • Accepted : 2021.04.03
  • Published : 2021.10.25
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Abstract

With the increasing availability of high-performance computing (HPC) platforms, uncertainty quantification (UQ) and sensitivity analyses (SA) can be efficiently leveraged to optimize design parameters of complex engineering problems using modeling and simulation tools. The workflow involved in such studies heavily relies on HPC resources and hence requires pre-processing and post-processing capabilities of large amounts of data along with remote submission capabilities. The NEAMS Workbench addresses all aspects of the workflows involved in these studies by relying on a user-friendly graphical user interface and a python application program interface. This paper highlights the NEAMS Workbench capabilities by presenting a semiautomated coupling scheme between Dakota and any given package integrated with the NEAMS Workbench, yielding a simplified workflow for users. This new capability is demonstrated by running a SA of a turbulent flow in a pipe using the open-source Nek5000 CFD code. A total of 54 jobs were run on a HPC platform using the remote capabilities of the NEAMS Workbench. The results demonstrate that the semiautomated coupling scheme involving Dakota can be efficiently used for UQ and SA while keeping scripting tasks to a minimum for users. All input and output files used in this work are available in https://code.ornl.gov/neams-workbench/dakota-nek5000-study.

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Acknowledgement

This work was funded by the Nuclear Energy Advanced Modeling and Simulation program (NEAMS) within the Nuclear Energy Office of the US Department of Energy. The work was performed at Oak Ridge National Laboratory (ORNL) and Sandia National Laboratories (SNL). This manuscript has been authored by UT-Battelle, LLC (ORNL), under contract DE-AC05-00OR22725 with the US Department of Energy (DOE). Sandia National Laboratories is a multi-mission laboratory managed and operated by National Technology and Engineering Solutions of Sandia, LLC, a wholly owned subsidiary of Honeywell International Inc., for the U.S. Department of Energy's National Nuclear Security Administration under contract DE-NA0003525. The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paidup, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan). This paper describes objective technical results and analysis. Any subjective views or opinions that might be expressed in the paper do not necessarily represent the views of the US Department of Energy or the United States Government.

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