vfsm¶
- Mapdl.vfsm(action='', encl='', opt='', maxiter='', conv='', **kwargs)¶
Adjusts view factor matrix to satisfy reciprocity and/or row sum properties.
APDL Command: VFSM
- Parameters
- action
Action to be performed:
Define - Define a view factor summation (default)
- Clear - Resets the scaling method to 0 for all
enclosures. All subsequent arguments are ignored.
Status - Outputs the OPT value for each enclosure in the model.
- encl
Previously defined enclosure number for the view factor adjustment.
- opt
Option key:
0 - The view factor matrix values are not adjusted (default).
- 1 - The view factor matrix values are adjusted so that the
row sum equals 1.0.
- 2 - The view factor matrix values are adjusted so that the
row sum equals 1.0 and the reciprocity relationship is satisfied.
- 3 - The view factor matrix values are adjusted so that the
original row sum is maintained.
- 4 - The view factor matrix values are adjusted so that the
original row sum is maintained and the reciprocity relationship is satisfied.
- maxiter
Maximum number of iterations to achieve convergence. Valid only when OPT = 2 or 4. Default is 100.
- conv
Convergence value for row sum. Iterations will continue (up to MAXITER) until the maximum residual over all the rows is less than this value. Valid only when OPT = 2 or 4. Default is 1E-3.
Notes
To have a good energy balance, it is important to satisfy both the row sum and reciprocity relationships. For more information, see View Factors in the Mechanical APDL Theory Reference.
OPT = 1 and 2 are suitable for perfect enclosures. OPT = 1 is less expensive than OPT = 2 because no iterations are involved. However, with OPT = 1, the reciprocity relationship is not satisfied.
OPT = 3 and 4 are suitable for leaky enclosures. OPT = 3 is less expensive than OPT = 4 because no iterations are involved. However, with OPT = 3, the reciprocity relationship is not satisfied.
The VFSM command must be used before VFOPT is issued, or Solve is initiated.