ModelBuilder-2D

ModelBuilder-2D is a customized version of the open source CMB ModelBuilder simulation preprocessing application for numerical simulation. To provide general familiarization with CMB, this version of modelbuilder is designed to construct and carry out basic numerical simulations with two-dimensional geometry. In paricular, this version of modelbuilder includes a two-dimensional finite-element solver for flat stress problems. Users can input model geometry by creating and importing text files that describe planar polygon shapes. Model edge and vertex entities can be assigned simulation attributes to specify loads and displacement constraints. Users can generate unstructured triangle meshes from geometric models, generate solver input files, run the solver, and visualize the computed results (stress and displacement fields) from the modelbuilder user interface.

Contents:

• Installing ModelBuilder-2D
• Feature Walkthrough
  • Creating a Project
  • Importing Geometry
  • Starting a Stress/Strain Analysis
  • Assigning Boundary and Load Conditions
  • Generating the Mesh
  • Generating the Input File
  • Running the MinimalFEM Solver
  • Viewing the Results
  • Closing the Project

Note that the ModelBuilder/CMB platform is not tied to any specific modeling, meshing, or simulation software, but instead is designed so that it can be customized for nearly any simulation toolset and workflow. In this particular implementation, we have integrated three open-source software libraries for demonstration:

• The Boost Polygon library provides the geometry manipulations for the CMB modeling subsystem.

• The Aquaveo XMS Mesher is used to generate two-dimensional unstructured meshes from polygons.

• And the MinimalFEM solver is used for the finite-element calculations.