Parameter

Values

Description

GAPGPRJ

<NORM, 1, SHORT, or 2>

Default = SHORT

For CGAPG and contact elements, controls how the projection onto the obstacle element (or node patch) is performed.

If NORM or 1, the projection of node GA (or slave node for CONTACT) to the obstacle B is performed along the normal to the surface of the obstacle (a patch of nodes or an element face). If such normal projection falls outside the patch of nodes or element face (within 5% tolerance), an error message is issued for GAPG elements, while no contact element is created on the CONTACT interface.

If SHORT or 2, the node GA (or slave node for CONTACT) is projected onto the obstacle B along the shortest distance. For cases where the normal projection falls within the bounds of the obstacle, this coincides with the NORM option. For cases where the normal projection falls outside the obstacle, this option will choose the point on the obstacle that is nearest to GA or slave node.