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!PARTITION

Line 1

!PARTITION, TYPE=<type>, METHOD=<method>, DOMAIN=<domain> [, optional parameter]

Parameter
TYPE	Domain decomposition type (required)
METHOD	Domain decomposition method (required)
DOMAIN	Number of domains (required)
DEPTH	Overlap depth (optional)
UCD	Output of a UCD file for the domain decomposition image (optional)
CONTACT	Handling of contact points in domain decomposition (optional)
CONTACT_OWNER	Ownership scheme for parallel contact (optional)

Parameter	Parameter Value	Description
TYPE	NODE-BASED	Node-based decomposition
	ELEMENT-BASED	Element-based decomposition
METHOD	RCB	RCB method; the decomposition reference axes must be specified on line 2
	KMETIS	kMETIS
	PMETIS	pMETIS
DOMAIN		Number of domains
DEPTH		Overlap depth of subdomains (DEPTH=1 if omitted) Cannot be specified when TYPE=ELEMENT-BASED
UCD		UCD file name (optional)
CONTACT	DEFAULT	Perform ordinary domain decomposition without considering contact points (handled the same as SIMPLE)
	AGGREGATE	Assign the master and slave surfaces to the same subdomain
	DISTRIBUTE	Distribute the nodes on the master surface evenly among the subdomains
	SIMPLE	Perform ordinary domain decomposition without considering contact points (handled the same as DEFAULT)
CONTACT_OWNER	MASTER	Master-owner scheme (default). Partition the master surface by element-owning domains and replicate slave nodes to each master-owning domain
	SLAVE	Slave-owner scheme. Retain each slave node only in its owning domain and place the entire master surface in that domain Can be specified only when TYPE=NODE-BASED

CONTACT and CONTACT_OWNER are independent parameters and may be combined arbitrarily.

CONTACT_OWNER

In parallel contact analysis, this parameter specifies which domain is responsible for which part of a contact pair.

MASTER (default) partitions the master surface by the domains that own its elements and replicates slave nodes to all domains containing the master surface. Duplicate contact candidates are reconciled by aggregation across domains.

SLAVE reverses this arrangement. Each slave node is retained only by the domain that owns it, and that domain receives the entire master surface of the contact pair. With finite sliding (INTERACTION=FSLID on !CONTACT), a slave node may slide across a domain-partition boundary on the master surface. Under MASTER, master-surface adjacency is constructed only within each domain, so the adjacency search can be interrupted at the boundary; the slave node can then be judged temporarily out of contact, causing the Lagrange multiplier and friction history to be lost. Under SLAVE, the master surface required for the search is always available within the same domain, so this problem does not occur and the solution does not depend on the number of domains.

Because a domain specified with SLAVE retains the entire master surface, its memory usage and number of neighboring domains increase. It cannot be used together with TYPE=ELEMENT-BASED.

Line 2 (required only for METHOD=RCB)

(Line 2) DIR1, DIR2, DIR3, ... (specify for the number of decompositions)

Variable Name	Attribute	Description
DIRX	C	Decomposition reference axis (specified using lowercase x, y, or z)

Control File Examples

Example 1

!PARTITION, TYPE=NODE-BASED, METHOD=RCB, DOMAIN=8, DEPTH=1, UCD=mesh.inp
x, y, z

Example 2

!PARTITION, TYPE=ELEMENT-BASED, METHOD=PMETIS, DOMAIN=32

Example 3 (finite-sliding contact analysis)

!PARTITION, TYPE=NODE-BASED, METHOD=PMETIS, DOMAIN=8, CONTACT_OWNER=SLAVE