The OFFBEAT multi-dimensional fuel behavior solver

Scolaro, Alessandro; Clifford, Ivor; Pautz, Andreas

doi:10.1016/j.nucengdes.2019.110416

Cited by 36 publications

(8 citation statements)

References 24 publications

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“…The fourth verification case is a 2D linear‐elastic punch test from the NAFEMS benchmark series, 56 which we have already analyzed in a previous publication 42 using the penalty method. The case, approximated as in plane strain, consists of a cylindrical steel punch pressed with a constant point load of

35 kN

on an aluminum foundation.…”

Section: Benchmark Casesmentioning

confidence: 99%

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Development of a semi‐implicit contact methodology for finite volume stress solvers

Scolaro

Clifford

Pautz

2021

Numerical Meth Engineering

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The past decades have seen numerous efforts to apply the finite volume methodology to solid mechanics problems. However, only limited work has been done by the finite volume community toward the simulation of mechanical contact. In this article, we present a novel semi-implicit methodology for the solution of static force-loading contact problems with cell-centered finite volume codes. Starting from the similarities with multi-material problems, we derive an implicit discretization scheme for the normal contact stress with a straightforward inclusion of frictional forces and correction vectors for non-orthogonal boundaries. With the introduction of a sigmoid blending function interpolating between contact stresses and gap pressure, the proposed approach is extended to cases with partially closed gap. The contact procedure is designed around an arbitrary mesh mapping algorithm to allow for non-conformal meshes at the contact interface between the two bodies. Finally, we verify the contact methodology against five benchmarks cases.

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35 kN

on an aluminum foundation.…”

Section: Benchmark Casesmentioning

confidence: 99%

“…The implicit contact methodology has been implemented as a custom boundary condition in OFFBEAT, [41][42][43][44][45] a stress solver developed for nuclear engineering applications and based on the OpenFOAM C++ library. 31,46 In this section, we verify the methodology against five test cases with known solution.…”

Section: Benchmark Casesmentioning

confidence: 99%

Development of a semi‐implicit contact methodology for finite volume stress solvers

Scolaro

Clifford

Pautz

2021

Numerical Meth Engineering

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“…A previous attempt at modeling the core with PARCS is reported in [6], but the neutron flux comparison with the Serpent solution was not successful, especially in the outer fuel lattice region, due to the mismatch between PARCS mesh and the actual CROCUS fuel lattices. Furthermore, in line with the current efforts towards the use of more flexible numerical methodologies to implement deterministic neutron transport solvers capable of operating on unstructured meshes [7,8], the Laboratory for Reactor Physics and System Behaviour (LRS-EPFL) has started to develop new tools for reactor analysis based on the OpenFOAM finite-volume library [9,10], namely: the GeN-Foam multiphysics solver [11] and the OFFBEAT fuel behavior tool [12]. In particular, GeN-Foam is a multiphysics solver for the analysis of nuclear reactors that takes advantage of general finite-volume methodologies on unstructured meshes to provide enough flexibility for the study of non-conventional reactor designs, such as CROCUS.…”

Section: Introductionmentioning

confidence: 99%

Investigation and Validation of Unstructured Mesh Methodologies for Modeling Experimental Reactors

et al. 2022

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This paper summarizes a methodology developed at École Polytechnique Fédérale de Lausanne for the neutronic modeling of the CROCUS experimental reactor and proposes solutions to the challenges one may face while modeling a research reactor with a complex geometry. Indeed, the double-lattice configuration of CROCUS makes it difficult to use codes for neutron diffusion and transport relying on a structured mesh description. For this reason, and based on the available in-house competences, we decided to make use of the neutronic capabilities of the GeN-Foam multiphysics solver, which takes advantage of general finite volume methodologies on unstructured meshes to provide sufficient flexibility for the study of unconventional reactor designs. In this work, GeN-Foam is used to build a first SP3 model of CROCUS based on an unstructured mesh to have an explicit modeling of the double lattice and the water gap between the two lattices. Form functions are then used to reconstruct the intra-pin fission rates for validation against measured distributions. We also discuss the limitations of the SP3 approximation of neutron transport in regions with steep neutron flux gradients and the planned future developments.

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“…The open-source multi-scale code SCIANTIX (Pizzocri et al, 2020) is embedded in OFFBEAT to monitor the fission gas behavior. More details about the OFFBEAT code can be found in Scolaro et al (2020) and Scolaro (2021).…”

Section: Introductionmentioning

confidence: 99%

Extension of the Offbeat Fuel Performance Code to Finite Strains and Validation Against Loca Experiments

Brunetto¹,

Scolaro²,

Fiorina³

et al. 2022

SSRN Journal

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The OFFBEAT multi-dimensional fuel behavior solver

Cited by 36 publications

References 24 publications

Development of a semi‐implicit contact methodology for finite volume stress solvers

Development of a semi‐implicit contact methodology for finite volume stress solvers

Investigation and Validation of Unstructured Mesh Methodologies for Modeling Experimental Reactors

Extension of the Offbeat Fuel Performance Code to Finite Strains and Validation Against Loca Experiments

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