DESIGN OF A CODE-AGNOSTIC DRIVER APPLICATION FOR HIGH-FIDELITY COUPLED NEUTRONICS AND THERMAL-HYDRAULIC SIMULATIONS

¹ Argonne National Laboratory 9700 S. Cass Ave., Lemont, IL 60439, USA
² Oak Ridge National Labroatory 1 Bethel Valley Rd., Oak Ridge, TN 37831, USA
³ University of California-Berkeley 3115 Etcheverry Hall, Berkeley, CA 94708, USA
⁴ Massachusetts Institute of Technology 77 Massachusetts Ave., Cambridge, MA 02139, USA

promano@anl.gov
hamiltonsp@ornl.gov
rahaman@anl.gov
novak@berkeley.edu ebm5351@psu.edu
smharper@mit.edu
pshriwise@anl.gov

Published online: 22 February 2021

Abstract

While the literature has numerous examples of Monte Carlo and computational fluid dynamics (CFD) coupling, most are hard-wired codes intended primarily for research rather than as standalone, general-purpose codes. In this work, we describe an open source application, ENRICO, that allows coupled neutronic and thermal-hydraulic simulations between multiple codes that can be chosen at runtime (as opposed to a coupling between two specific codes). In particular, we outline the class hierarchy in ENRICO and show how it enables a clean separation between the logic and data required for a coupled simulation (which is agnostic to the individual solvers used) from the logic/data required for individual physics solvers. ENRICO also allows coupling between high-order (and generally computationally expensive) solvers to low-order “surrogate” solvers; for example, Nek5000 can be swapped out with a subchannel solver.

ENRICO has been designed for use on distributed-memory computing environments. The transfer of solution fields between solvers is performed in memory rather than through file I/O.We describe the process topology among the different solvers and how it is leveraged to carry out solution transfers. We present results for a coupled simulation of a single light-water reactor fuel assembly using Monte Carlo neutron transport and CFD.