Training Manual 001419

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2.2 Loading and Solution

• Enhancements in the loading and solution area
  include
• A. Function BC tool
• B. Direct Matrix Assembly
• C. Sparse Solver Improvements

2
Loading Solution A. Function BC Tool

• Allows building a library of functions that can
  be used to apply complex boundary conditions
  easily
• Calculator like functionality to build equations
• Supports all primary variables (x, y, z, temp,
  pres, time etc.)
• Each function must be saved to a file (archived)
• Functions can be retrieved from archived files
  and applied as TABLE array loads
• Tabular boundary conditions extended to support
  all FLOTRAN dofs
• Details covered in CFD Acoustics

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Loading Solution Function BC Tool
When needed read in any saved function
Create functions using function builder
Supply a parameter name for the array and any
other required data as directed
Save functions to files and create an archive of
various functions
Apply load using existing table and the
parameter name
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Loading Solution Function BC Tool

• Preprocessor gt -Loads- Apply gt -Functions-
  Define/Edit

Single equation e.g. Hf 0.5sqrt(x)
Multivalued function e.g. 0ltxlt1, Hf
0.5sqrt(x) 1ltxlt2, Hf 0.25x0.3
Regime variable defined
Standard Calculator functions
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Loading Solution Function BC Tool
Specify the range for Regime 2
Specify the function for Regime 2
Save the function to a file for later retrieval
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Loading Solution Function BC Tool

• When you want to use a saved function,
• Preprocessor -gt Loads-gt Apply gt -Functions- Read
  File

Supply table array parameter name
Fill in material number (if needed) and any
constants in the equations
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Loading Solution B. Direct Assembly

• Element matrix generation and assembly for ALL
  element types in memory
• Default assembly process starting in 5.7 for
  static, full transient and Block Lanczos modal
• No EMAT or EROT files for most analyses. FULL
  file created if required.
• Supports all nonlinearities
• Less disk space and I/O resulting in up to 30
  reduction in solution time on PCs
• Use the command EMATCREATE,YES to switch to
  writing the emat file
• Required for PSOLVE procedures and prestressed
  analyses

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Loading Solution C. Sparse Solver Improvements

• Memory usage improvements
• Uses dynamic memory allocation
• Disk I/O improvements
• Disk space reduced by 2 for large jobs (no more
  LN22 file)
• Eliminates I/O for small models
• Up to 15 reduction in CPU time for models having
  greater than 50,000 dofs