ddoption#
- Mapdl.ddoption(decomp='', nprocpersol='', numsolforlp='', **kwargs)#
Sets domain decomposer option for Distributed ANSYS.
APDL Command: DDOPTION
- Parameters:
- Decomp
Controls which domain decomposition algorithm to use.
AUTO - Automatically selects the optimal domain decomposition method (default).
MESH - Decompose the FEA mesh.
FREQ - Decompose the frequency domain for harmonic analyses.
CYCHI -Decompose the harmonic indices for cyclic symmetry modal analyses.
- nprocpersol
Number of processes to be used for mesh-based decomposition in conjunction with each frequency solution (Decomp = FREQ) or harmonic index solution (Decomp = CYCHI). Defaults to 1. This field is ignored when Decomp = MESH.
- numsolforlp
Number of frequency or harmonic index solutions in a subsequent linear perturbation harmonic or linear perturbation cyclic modal analysis. This field is ignored when Decomp = MESH
Notes
This command controls options relating to the domain decomposition algorithm used by Distributed ANSYS to split the model into pieces (or domains), with each piece being solved on a different processor.
The greedy domain decomposition algorithm starts from a single element at a corner of the model. The domain grows by taking the properly connected neighboring elements and stops after reaching the optimal size.
The METIS domain decomposition algorithm starts by creating a graph from the finite element mesh. It then uses a multilevel graph partitioning scheme which reduces the size of the original graph, creates domains using the reduced graph, and then creates the final CPU domains by expanding the smaller domains from the reduced graph back to the original mesh.