An Agile Design-to-Simulation Workflow Using a New Conforming Moving Least Squares Method

Technical Report · Sun Sep 01 04:00:00 EDT 2019

DOI:https://doi.org/10.2172/1569655· OSTI ID:1569655

Koester, Jacob J. ^[1]; Tupek, Michael R. ^[1]; Mitchell, Scott A. ^[1]

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1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)

This report summarizes the accomplishments and challenges of a two year LDRD effort focused on improving design-to-simulation agility. The central bottleneck in most solid mechanics simulations is the process of taking CAD geometry and creating a discretization of suitable quality, i.e., the "meshing" effort. This report revisits meshfree methods and documents some key advancements that allow their use on problems with complex geometries, low quality meshes, nearly incompressible materials or that involve fracture. The resulting capability was demonstrated to be an effective part of an agile simulation process by enabling rapid discretization techniques without increasing the time to obtain a solution of a given accuracy. The first enhancement addressed boundary-related challenges associated with meshfree methods. When using point clouds and Euclidean metrics to construct approximation spaces, the boundary information is lost, which results in low accuracy solutions for non-convex geometries and mate rial interfaces. This also complicates the application of essential boundary conditions. The solution involved the development of conforming window functions which use graph and boundary information to directly incorporate boundaries into the approximation space.

• Research Organization: Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA); USDOE Laboratory Directed Research and Development (LDRD) Program
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 1569655
• Report Number(s): SAND--2019-11851; 679918
• Country of Publication: United States
• Language: English

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