Create a new sub-task.

  Create a sub-task

1. Select Postprocessor as the sub-task type.

     Postprocessor

2. When prompted, enter a name for the postprocessor sub-task.

In the F.E.M. Task Postprocessor menu, select Self-contact detection.

Self-contact detection

Enable the self contact detection postprocessor.

Enable self-contact detection

By enabling the postprocessor, you can later choose to disable it without entirely removing the postprocessor.

Specify actions to perform if self-contact is detected, such as:

As part of the contact detection process, a search is conducted for each node of the fluid shell to establish whether it has come into contact with itself. Though unlikely, you have the option of revising the default settings of the search algorithm.

  Advanced options

Perform the following steps in the menu that opens.

1. You have the choice of five predefined groups of search settings. The groups can be "faster" (that is, result in faster computation times for the search) or "safer" (that is, conduct searches that are more thorough but require more computation time). By default, a fast group of settings is selected, as this group is appropriate for a relatively broad range of cases.

   Click one of the following menu items to select the settings that best represent how you want the search conducted:

     Reset to very fast settings

     Reset to fast settings

     Reset to safe settings

     Reset to very safe settings

     Reset to safest settings

   The text at the top of the menu displays the details of how the settings are currently defined.

2. You can revise any of the following settings, in order to customize the predefined group to be more appropriate for your problem. In order to understand these settings, note that the search is conducted within a box-shaped zone that encompasses the whole shell. This zone is divided along the Cartesian axes into overlapping search sectors. For a given node of the fluid domain, the contact search is performed in the sector where that node is located.

   •   Modify expansion of the search zone

     This setting allows you to expand the search zone, by increasing its length along each axis by a specified fraction of the largest shell dimension.

   •   Modify search sector divisions per axis

     This setting defines the number (which must be a positive integer) into which the search zone will be divided along each axis. For example, if you enter 3 for the New value, the search zone will be divided into 27 (that is, 3³) sectors.

   •   Modify overlap of sectors

     This setting defines the amount of overlap between neighboring sectors, and is expressed as a fraction of the largest dimension of each sector.