Reactor Module

Overview

This reactor module aims to add advanced meshing capabilities to MOOSE so that users can create complex-geometry meshes that are related to reactors without turning to external meshing software.

This module consists of a series of new mesh generators to enable meshing of reactor cores including both hexagonal and Cartesian geometries. The functionalities of these mesh generators cover:

• Creating unit hexagon meshes as basic components for the core (other polygon meshes can also be created);

• Stitching the unit hexagon meshes and adding appropriate peripheral regions to form hexagon assembly regions;

• Creating unit hexagon meshes with adaptive external boundaries that are stitch-able with assembly meshes;

• Stitching the assembly meshes and adaptive-boundary unit hexagon meshes to form a core mesh;

• Modifying unit hexagon meshes to create azimuthal section blocks to enable static simulation of rotational control drum;

• Adding reporting IDs (extra element integers) to mesh elements to identify pins, assemblies regions;

• Adding a peripheral region to a given input mesh to produce a mesh with a circular external boundary.

Aside from the mesh generators, this reactor module also includes a Function object to enable dynamic simulation of rotational control drums in a reactor core mesh.

Tutorial

This module is demonstrated in detail in the MOOSE Reactor Module Meshing Tutorial.

Objects and Syntax

• Reactor App
• MultiControlDrumFunctionA function that returns an absorber fraction for multiple control drums application.

• Reactor App
• AdvancedConcentricCircleGeneratorThis AdvancedConcentricCircleGenerator object is designed to mesh a concentric circular geometry.
• AssemblyMeshGeneratorThis AssemblyMeshGenerator object is designed to generate assembly-like structures, with IDs, from a reactor geometry. The assembly-like structures must consist of a full pattern of equal sized pins from PinMeshGeneratorA hexagonal assembly will be placed inside of a bounding hexagon consisting of a background region and, optionally, duct regions.
• AzimuthalBlockSplitGeneratorThis AzimuthalBlockSplitGenerator object takes in a polygon/hexagon concentric circle mesh and renames blocks on a user-defined azimuthal segment / wedge of the mesh.
• CartesianConcentricCircleAdaptiveBoundaryMeshGeneratorThis CartesianConcentricCircleAdaptiveBoundaryMeshGenerator object is designed to generate square meshes with adaptive boundary to facilitate stitching.
• CartesianIDPatternedMeshGeneratorGenerate Certesian lattice meshes with reporting ID assignment that indentifies individual components of lattice.
• CartesianMeshTrimmerThis CartesianMeshTrimmer object performs peripheral and/or across-center (0, 0, 0) trimming for assembly or core 2D meshes generated by PatternedCartesianMG.
• CoarseMeshExtraElementIDGeneratorAssign coarse element IDs for elements on a mesh based on a coarse mesh.
• CoreMeshGeneratorThis CoreMeshGenerator object is designed to generate a core-like structure, with IDs, from a reactor geometry. The core-like structure consists of a pattern of assembly-like structures generated with AssemblyMeshGenerator and is permitted to have "empty" locations. The size and spacing of the assembly-like structures is defined, and enforced by declaration in the ReactorMeshParams.
• DepletionIDGeneratorThis DepletionIDGenerator source code is to assign depletion IDs for elements on a mesh based on material and other extra element IDs.
• ExtraElementIDCopyGeneratorCopy an extra element ID to other extra element IDs.
• FlexiblePatternGeneratorThis FlexiblePatternGenerator object is designed to generate a mesh with a background region with dispersed unit meshes in it and distributed based on a series of flexible patterns.
• HexIDPatternedMeshGeneratorThis PatternedHexMeshGenerator source code assembles hexagonal meshes into a hexagonal grid and optionally forces the outer boundary to be hexagonal and/or adds a duct.
• HexagonConcentricCircleAdaptiveBoundaryMeshGeneratorThis HexagonConcentricCircleAdaptiveBoundaryMeshGenerator object is designed to generate hexagonal meshes with adaptive boundary to facilitate stitching.
• HexagonMeshTrimmerThis HexagonMeshTrimmer object performs peripheral and/or across-center (0, 0, 0) trimming for assembly or core 2D meshes generated by PatternedHexMG.
• PatternedCartesianMeshGeneratorThis PatternedCartesianMeshGenerator source code assembles square meshes into a square grid and optionally forces the outer boundary to be square and/or adds a duct.
• PatternedCartesianPeripheralModifierPatternedPolygonPeripheralModifierBase is the base class for PatternedCartPeripheralModifier and PatternedHexPeripheralModifier.
• PatternedHexMeshGeneratorThis PatternedHexMeshGenerator source code assembles hexagonal meshes into a hexagonal grid and optionally forces the outer boundary to be hexagonal and/or adds a duct.
• PatternedHexPeripheralModifierPatternedPolygonPeripheralModifierBase is the base class for PatternedCartPeripheralModifier and PatternedHexPeripheralModifier.
• PeripheralRingMeshGeneratorThis PeripheralRingMeshGenerator object adds a circular peripheral region to the input mesh.
• PeripheralTriangleMeshGeneratorThis PeripheralTriangleMeshGenerator object is designed to generate a triangulated mesh between a generated outer circle boundary and a provided inner mesh.
• PinMeshGeneratorThis PinMeshGenerator object is designed to generate pin-like structures, with IDs, from a reactor geometry. Whether it be a square or hexagonal pin, they are divided into three substructures - the innermost radial pin regions, the single bridging background region, and the square or hexagonal ducts regions.
• PolygonConcentricCircleMeshGeneratorThis PolygonConcentricCircleMeshGenerator object is designed to mesh a polygon geometry with optional rings centered inside.
• ReactorMeshParamsThis ReactorMeshParams object acts as storage for persistent information about the reactor geometry.
• RevolveGeneratorThis RevolveGenerator object is designed to revolve a 1D mesh into 2D, or a 2D mesh into 3D based on an axis.
• SimpleHexagonGeneratorThis SimpleHexagonGenerator object is designed to generate a simple hexagonal mesh that only contains six simple azimuthal triangular elements, two quadrilateral elements, or six central azimuthal triangular elements plus a several layers of quadrilateral elements.
• SubdomainExtraElementIDGeneratorAssign extra element IDs for elements on a mesh based on mesh subdomains.
• TriPinHexAssemblyGeneratorThis TriPinHexAssemblyGenerator object generates a hexagonal assembly mesh with three circular pins in a triangle at the center.

• Reactor App
• HexagonalGridDivisionDivide the mesh along a hexagonal grid. Numbering of pin divisions increases first counterclockwise, then expanding outwards from the inner ring, then axially. Inner-numbering is within a radial ring, outer-numbering is axial divisions

• Reactor App
• CartesianGridPositionsCreate positions along a Cartesian grid.
• HexagonalGridPositionsCreate positions along a hexagonal grid. Numbering of positions increases first counterclockwise, then expanding outwards from the inner ring, then axially. Inner-numbering is within a radial ring, outer-numbering is axial divisions