The Method of Simultaneous Solutions Applied to Neutron Transport and Heat Conduction

Dean Price; Brian Kiedrowski; Benoit Forget

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arXiv · 2605.24606

The Method of Simultaneous Solutions Applied to Neutron Transport and Heat Conduction

Dean Price·Brian Kiedrowski·Benoit Forget

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Abstract

This paper provides an initial description of the Method of Simultaneous Solutions, a Monte Carlo approach that simultaneously solves multiple Boltzmann-transport-like phenomena. Here, it is used to simultaneously solve the neutron transport and heat conduction equations. Analytically-derived weighting factors are tracked through a neutron transport-governed random walk to tally statistical estimators that can be used to calculate the temperature distribution. In this initial presentation, the method is readily applicable to neutron-heat multiphysics problems where the heat source and neutron source are identically distributed spatially. The primary theoretical benefit of MOSS lies in the reduction of computational cost that occurs from the removal of a dedicated routine to solve the heat conduction equation. Practically, branching processes required to capture the disparate boundary conditions associated with these separate physical phenomena can lead to large computational times dedicated to a single physics. In addition, this correlated sampling-based method can suffer from infinite variance associated with statistical estimators if the stochastic processes being tracked are too different. The final drawback demonstrated in this paper is that the approximation of heat conduction as a Boltzmann transport-governed process leads to errors in calculated temperatures. The paper explores these drawbacks on two demonstration problems, a problem consisting of slab geometry and a problem consisting of a hexagonal pin cell.

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Dean Price, Brian Kiedrowski, Benoit Forget. 2026-05-23. The Method of Simultaneous Solutions Applied to Neutron Transport and Heat Conduction. https://arxiv.org/abs/2605.24606

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