The SIGMA v1.3 release includes a consolidated packaging of all geometry and mesh related components. Details on compatibility of the different tools and dependent libraries are available separately and all questions can be directed to <package>[email protected]. Current release contains the following SIGMA tools: Common Geometry Module (CGM) – Version 16.0 Mesh Oriented datABase (MOAB) –...
Read MoreOver the past several months, the RGG application that was developed jointly by Kitware and ANL has been completely taken down and not available for public use as a result of some licensing issues. We have now resolved all these issues and fixed both the SIGMA repositories and the RGG application. Please update your sources and follow the instructions below to get access to the tools. MeshKit...
Read MoreGenerating conformal hexahedral meshes with boundary layers for urban buildings and atmosphere is a challenging task. We have created a tool that reads a .geojson file with 3D building models and creates a CAD model and mesh for the buildings and the urban atmosphere for CFD simulations. We are looking at different strategies to automate the entire CFD model creation process. The same geometry...
Read MoreSIGMA v1.2.1 Release Notes SIGMA v1.2.1 Release Notes CGM Version 15.1 Enhancements Fixes MOAB Version 4.9.1 Features Enhancements Fixes MeshKit Version 1.4.1 Enhancements Fixes SIGMA v1.2.1 minor release includes a consolidated packaging of all geometry and mesh related components. Details on compatibility of the different tools and dependent libraries are available separately and all questions...
Read MoreThe July issue of Kitware news has a featured article on the collaborative effort between one of our own, Rajeev Jain (MeshKit/RGG) and the Kitware team funded by DOE Nuclear Energy Fast Track SBIR. Kitware has developed an open-source GUI tool that is integrated with RGG while leveraging Kitware’s existing projects including the Computational Model Builder (CMB), VTK, and ParaView, to...
Read MoreAssygen is capable of creating assemblies with varying properties in axial and radial direction. Coregen is designed to operate in parallel allowing the core creation, merging of nodes and saving the mesh file in parallel. This mesh, which uses 101 million volume elements to describe the reactor core, was generated by SHARP simulation tools in as little as seven...
Read MoreCoupled Thermal-Irradiation-Structural Analysis of HGTR Fuel Brick Using ABAQUS Assygen and CUBIT were used in generating the models for this structural analysis. Axial and radial mesh size APREPRO variables in the template journal file created by Assygen were modified to create the desired mesh quality. The material considered is H-451 transversely isotropic graphite. At the end of 4.6 years...
Read More1. Geometry: Surface or volume core models can be generated; if unspecified, the default is to generate a volume model. 2. GeometryType: The GeometryType is specified as rectangular, hexflat, or hexvertex (see section 2 of this paper for a description of the hexagonal lattice types). 3. GeomEngine: This keyword typically takes the ‘OCC’. Note, specified engine type...
Read MoreNOTE: common.inp is a reserved file name for RGG process, when present AssyGen loads it for all assemblies that form the core. This avoids repetition of keywords across all assemblies forming the core model. 1. Geometry: Assembly geometry can be output as a collection of 2D surfaces, or as a collection of volumes swept out by those surfaces. If this keyword is not used, AssyGen produces a...
Read MoreThis is a small hexagonal nuclear reactor core assembly used for small-scale testing of mesh generation and multiphysics analysis of reactor cores. The geometry is generated using the Reactor Geometry (& mesh) Generator, RGG, and meshed using Cubit. RGG input: sahex.inp CUBIT .jou file generated by Assygen: sahex.jou Geometry: ACIS, STEP Meshes: 512K hex (ExodusII, h5m), 4M hex (ExodusII,...
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