55 lines
2.0 KiB
Plaintext
55 lines
2.0 KiB
Plaintext
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.. _derefine :
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>  _place_holder;
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>
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> **_DEREFINE_**
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> > This routine derefines a mesh by deleting points using the merge routine
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based on one of the following refine_types. **edge** will refine if element
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edge length is less then value. **volume** will merge if element volume is
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less than value. The merge routine will first attempt the smallest element
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edge then the next smallest, etc. **aspect** will derefine where aspect ratio
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is less than value. **pinchedge** will allow merging of adjacent points across
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a thin layer to eliminate the layer where it is too thin. **pinchedge** should
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be used only with pointtype1 and pointtype2 both equal to 2.
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Two criteria are currently enabled; **minsize** and **merge**. **minsize**
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allows merges if the calculation implied by refine_type is less than value.
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**merge** will merge the following first_point and second_point. The field
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option is not enabled and should be left default. The user specifies which
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merges are acceptable by designating the allowable pointtypes. Nodes with
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pointtype1 are merged to nodes of pointtype2. If pointtype1 and pointtype2 are
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both equal to 2, the code only merges if the nodes are both on the same
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material interface (use **pinchedge** if deleted nodes should be on different
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interfaces of the same material). **derefine** will not merge if an
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unacceptable element is created. **derefine** will work on material interfaces
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if all the children are set with the **settets** command. Various combinations
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of **derefine** may be used to improve the mesh. **recon** may be used to
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return to a delaunay mesh after using the **derefine** command.
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>
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> FORMAT:
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>
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>> **derefine/minsize**/field/pointtype1
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pointtype2/refine_type/first_point/last_point/stride/value
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**derefine**/**merge**/first_point/second_point
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>
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> EXAMPLE:
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>
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>> **derefine/minsize**//0 0/**aspect**/ 1 0 0/1.e-3
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**derefine/minsize**//0 2/**volume**/**pset,get**,apset/5.
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**derefine/minsize**//10 _place_holder; 10**/edge**/1 0 0/5.
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**derefine/minsize**//2 2/**pinchedge**/1 0 0/1
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**derefine/merge**/21/22
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