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Extending a Low-order Inhomogeneous Adjoint Equations Model to a Higher-order Model with Verification on Integral Applications by Muhammad Ramzy Altahhan; René van Geemert; Maria Avramova; Kostadin Ivanov is a Engineering article available to read on EtoBox.

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A higher-order nodal mathematical inhomogeneous adjoint model conjugate to the NEM-M2B2 nodal diffusion forward model is developed and introduced in this research. Verification of the developed model is presented through applications in perturbation analysis and the IAEA-3D benchmark including adjusted forms of it. This paper’s objective is to explore ways of extending and optimizing a mathematical adjoint capability suitable for use in an industrial reactor code, such that it becomes not merely an approximate but rather the exact adjoint counterpart to the typically used higher-order nodal forward solvers used in mature industrial reactor codes. Specifically, it is investigated how to upgrade an already available lower-order nodal mathematical adjoint solver towards higher-order accuracy. An example of the latter is the lower-order nodal adjoint solver used in the ARTEMIS reactor code, in the technical context of stabilization and acceleration of embedded control rod search mechanisms. Though the latter adjoint solver proved suitable for the needed preconditioning purposes, while also enabling the benefit of computationally very lean adjoint iterations, several future developments

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Author

Muhammad Ramzy Altahhan; René van Geemert; Maria Avramova; Kostadin Ivanov

Publisher

Elsevier BV

Published

2022

Language

EN

Field

Engineering (Physical Sciences)