Embedded Boundaries

MFIX-Exa uses AMReX’s Embedded Boundaries to represent container walls. This allows MFIX-Exa to simulate a wide range of shapes and boundary conditions using constructive solid geometry. MFIX-Exa also has the capability of locally refining the computational meshes near walls.

Contents:

• Constructing Embedded Boundaries in MFIX-Exa
  • EB Specification
    • Native AMReX functions
    • CSG File Format
    • Planar Walls
    • STL File Format
  • How MFIX-Exa Constructs the EB Geometry
  • MFIX-Exa’s EB Data Structures
  • A note about constructing EB Levels
• Local Mesh Refinement at Walls
  • MFIX-Exa Initialization Process
• The Level-Set Function
  • Special Cases Involving Level-Sets