Layered CAD/CSG geometry for spatially complex radiation transport scenarios. (February 2023)

• Record Type: Journal Article
• Authors: Biondo, Elliott; Davidson, Gregory; Ade, Brian
• Is Part Of: Annals of nuclear energy. Volume 181(2023)
• Publication Date: 2023-02
• Subjects: Monte Carlo radiation transport -- CAD geometry -- LiDAR; Nuclear energy -- Periodicals; Nuclear engineering -- Periodicals; 621.4805
• DOI: 10.1016/j.anucene.2022.109569
• Languages: English
• ISSNs: 0306-4549

Abstract

Abstract: Many spatially complex fission, fusion, and national security Monte Carlo (MC) radiation transport scenarios involve combining computer-aided design (CAD) models with constructive solid geometry (CSG) models. A layered geometry method has been implemented in the Shift MC code to address this need. With layered geometry, multiple CAD and/or CSG models can be clipped, translated, rotated, and placed in overlapping layers to form transport-ready geometries. The utility of this method is demonstrated with two problems: (1) a fixed-source simulation with a layered geometry consisting of a LiDAR-generated CAD model of the Combined Arms Collective Training Facility urban environment overlaid with CSG models of a mock hotel and a detector apparatus, and (2) a k -eigenvalue calculation using a layered geometry model of the Transformational Challenge Reactor consisting of CAD fuel elements placed in a CSG core. Tallied particle flux distributions match expectations, but tracking robustness must be improved prior to general-purpose use. Highlights: New method for combining CAD and CSG models for Monte Carlo radiation transport. Demonstrated with a LiDAR-generated CAD model of an urban environment. Demonstrated with a reactor consisting of complex fuel elements modeled in CAD.