An iterative scheme to include turbulent diffusion in advective-dominated transport of delayed neutron precursors

In this study, the Method of Characteristics (MOC) for Delayed Neutron Precursors (DNPs) is used to solve the precursors balance equation with turbulent diffusion. The diffusivity of DNPs, significantly higher than molecular diffusivity, emerges in turbulent flows from the time-averaging of the DNPs...

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Bibliographic Details
Published inarXiv.org
Main Authors Mathis Caprais, Bergeron, André
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 06.11.2024
Subjects
Diffusivity
Fission products
Fluid dynamics
Fluid flow
High Reynolds number
Mass balance
Method of characteristics
Precursors
Schmidt number
Turbulent diffusion
Turbulent flow
Two dimensional flow
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Summary:In this study, the Method of Characteristics (MOC) for Delayed Neutron Precursors (DNPs) is used to solve the precursors balance equation with turbulent diffusion. The diffusivity of DNPs, significantly higher than molecular diffusivity, emerges in turbulent flows from the time-averaging of the DNPs mass balance equation. To integrate this effect within the MOC framework, the advection-reaction component of the DNPs balance equation is solved using the MOC, while the diffusive source is computed from the concentration of the previous iteration. The method is validated on a 2D recirculating pipe reactor with high Reynolds number flow, comparing the MOC with diffusion to a standard finite volume (FV) discretization of the fission products balance equation. Additionally, the impact of the diffusivity term on DNP distributions and reactor reactivity is quantified as a function of the turbulent Schmidt number.
ISSN:2331-8422