**perturb_inside

Description

This command is used to perturb a mesh geometry with a given uniform random law and a deformation factor (works only for 3D mesh if mesh surface must be preserved, e.g. without command move_all).

Syntax

The command has the following syntax:

**perturb_inside \(~\,\) *factor moving-factor \(~\,\) [*dir num_dir ] \(~\,\) [*move_all ] \(~\,\) [*nset nset_name ]

*factor

gives the moving factor distance.

*dir

the component of nodal positions to perturb (1,2 and 3). By default, all the three components are modified.

*move_all

imposes the perturbation to be applied also on the mesh surface (works for meshes in any dimension).

*nset

A node set to not perturb if move_all is true, and vice-versa.

Example

This example shows how to perturb the third component of the nodal positions on the top surface of a cube.

****mesher
 ***mesh
  **mesh_quad_cube
   *size 1.
   *ncut 10
  **nset top
   *func z>0.99;
  **perturb_inside
   *factor 0.04
   *dir 3
   *nset top
****retur