6.4. Step 1: Determine the Substep to Initiate Rezoning ........................................................................ 118
6.5. Step 2. Initiate Rezoning ................................................................................................................ 119
6.6. Step 3: Select a Region to Remesh ................................................................................................. 119
6.7. Step 4: Perform the Remeshing Operation ..................................................................................... 120
6.7.1. Choosing a Remeshing Method ............................................................................................ 121
6.7.1.1. Remeshing Using a Program-Generated New Mesh (2-D) .............................................. 121
6.7.1.1.1. Creating an Area to Remesh ................................................................................ 121
6.7.1.1.2. Using Nodes From the Old Mesh ......................................................................... 122
6.7.1.1.3. Hints for Remeshing Multiple Regions ................................................................ 122
6.7.1.1.4. Generating a New Mesh ..................................................................................... 122
6.7.1.2. Remeshing Using a Generic New Mesh (2-D and 3-D) ................................................... 123
6.7.1.2.1. Using the REMESH Command with a Generic New Mesh ...................................... 123
6.7.1.2.2. Requirements for the Generic New Mesh ............................................................. 123
6.7.1.2.3. Using the REGE and KEEP Remeshing Options ..................................................... 125
6.7.1.3. Remeshing Using Manual Mesh Splitting (2-D and 3-D) ................................................ 126
6.7.1.3.1. Understanding Mesh Splitting ............................................................................. 127
6.7.1.3.2. Geometry Details for Mesh Splitting ................................................................... 127
6.7.1.3.3. Using the REMESH Command for Mesh Splitting .................................................. 130
6.7.1.3.4. Mesh-Transition Options for 2-D Mesh Splitting ................................................... 130
6.7.1.3.5. Mesh-Transition Options for 3-D Mesh Splitting ................................................... 132
6.7.1.3.6. Improving the Local Topology of Tetrahedral Meshes via Edge and Face Swap-
ping ................................................................................................................................. 134
6.7.1.3.7. Improving Tetrahedral Element Quality via Mesh Morphing ................................. 135
6.7.2. Mesh Control ....................................................................................................................... 136
6.7.3. Remeshing Multiple Regions at the Same Substep ................................................................ 137
6.8. Step 5:Verify Applied Contact Boundaries, Surface-Effect Elements, Loads, and Boundary Condi-
tions ................................................................................................................................................... 138
6.8.1. Contact Boundaries .............................................................................................................. 138
6.8.2. Surface-Effect Elements ....................................................................................................... 138
6.8.3. Pressure and Contiguous Displacements ............................................................................... 139
6.8.4. Forces and Isolated Applied Displacements ........................................................................... 139
6.8.5. Nodal Temperatures ............................................................................................................. 139
6.8.6. Other Boundary Conditions and Loads ................................................................................. 140
6.9. Step 6: Map Variables and Balance Residuals .................................................................................. 140
6.9.1. Mapping Solution Variables .................................................................................................. 140
6.9.2. Balancing Residual Forces ..................................................................................................... 140
6.9.3. Interpreting Mapped Results ................................................................................................ 142
6.9.4. Handling Convergence Difficulties ........................................................................................ 142
6.10. Step 7: Perform a Multiframe Restart ............................................................................................ 142
6.11. Repeating the Rezoning Process if Necessary ............................................................................... 143
6.11.1. File Structures for Repeated Rezonings ............................................................................... 143
6.12. Postprocessing Rezoning Results ................................................................................................. 144
6.12.1. Using the Database Postprocessor (POST1) ......................................................................... 144
6.12.1.1. Listing the Rezoning Results File Summary ................................................................. 144
6.12.1.2. Animating the Rezoning Results ................................................................................. 145
6.12.2. Using the Time-History Postprocessor (POST26) .................................................................. 145
6.13. Rezoning Restrictions .................................................................................................................. 145
6.14. Stabilization in a Rezoning Analysis ............................................................................................. 146
6.15. Rezoning Examples ..................................................................................................................... 146
6.15.1. Example: Rezoning Using a Program-Generated New Mesh ................................................. 147
6.15.1.1. Initial Input for the Analysis ........................................................................................ 147
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Nonlinear Adaptivity Analysis Guide
