**nset_for_cell

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`**nset_for_cell`#

Description#

This command creates node sets (nsets) required to apply periodicity boundary conditions on unit cells. It outputs the MPCs conditions to be applied on the periodic unit cell (after ***equation).

Syntax#

**nset_for_cell \(~\,\) [ *name cell_name] \(~\,\) [ *nset nset ] \(~\,\) [ *prec tolerance] \(~\,\) *b0 (vector) \(~\,\) *b1 (vector) \(~\,\) [ *b2 (vector) ] \(~\,\) [ *faces face1 face2 … faceN faceN+1 ]

*name: is the name prefix of the generated nsets. The default name is cell.
*nset: is the target node set. By default nset = ALL_NODE.
*prec: a tolerance to check if the found matching nodes are periodic according to periodicity vectors.
*b0, *b1 and *b2: are the periodicity vectors.
*faces: is the pairs of faces. If pair faces are not provided, the algorithm will iterate on all mesh edges to find the matching nodes and this may slow it down.

Example#

An example showing the use of this command in 3D is provided in $Z7TESTS/Program_test/Master_test/INP/elastic_periodic.inp

****mesher
 ***mesh elastic_periodic
  **open cellule2d.geof
   **nset_for_cell
    *prec 0.001
    *name per
    *b0 (1.800000e+00 1.900000e+00  0.)
    *b1 (-1.800000e+00  1.900000e+00 0.)
****return

../../_images/cellule2d.svg

The output is

Periodicity boundary conditions:
**mpc1 per1 U1
**mpc1 per1 U2
**mpc2 per2 U1 per3 U1
**mpc2 per2 U2 per3 U2