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Casting a wider net
Craig Piercycpiercy@ans.org
Recently, a colleague related to me a conversation overheard at an industry forum in which ANS was referred to as a group of “academics” who were of limited use in expanding the workforce needed to deliver a nuclear resurgence.
While not new, this criticism still gets me hypertensive when I hear it. Many still see ANS as a bunch of academics and “labbies” disconnected from the day-to-day commercial nuclear race.
Yet, I also understand the charge is not entirely without foundation. Pop your head into a technical session at an ANS national conference, and you’re bound to hear academics presenting research that, to nontechnical ears, sounds esoteric.
Rodolfo M. Ferrer, HyeongKae Park
Nuclear Science and Engineering | Volume 196 | Number 6 | June 2022 | Pages 637-650
Technical Paper | doi.org/10.1080/00295639.2021.2011668
Articles are hosted by Taylor and Francis Online.
The recently developed High-Order, Low-Order scheme for the solution of thermal radiative transfer problems is applied as an acceleration method to the neutral particle transport equation. The resulting Corner Balance Nonlinear Diffusion Acceleration (CB-NDA) is derived, and a stability analysis is performed in conjunction with moment-based, spatially linear discretizations. These spatial discretizations correspond to the lumped Linear Discontinuous (LD) and Linear Characteristic (LC) schemes, which possess the thick diffusion limit. The lumped LD and LC schemes satisfy corner balance equations, which in turn are used to derive the CB-NDA. Two variants of the CB-NDA include the net current and partial current formulations. Numerical results are presented that verify the theoretical predictions and implementation. Theoretical spectral radius from the analysis is verified by comparison to values from the numerical solution of a one-dimensional transport problem. Results indicate similar stability between the CB-NDA–accelerated lumped LD and LC schemes. The net current–based CB-NDA is found to be unstable whereas the partial current formulation remains stable over the range of scattering ratios and optical thicknesses.