9.15 Selective Nodal Penalty Element

The nodal penalty element is used to restrain a nodal value at a particular node, in a particular direction, to remain positive. The element is used in free-surface searches (viz., unconfined flow problems). Nodal penalty elements have no effect on the size of the stiffness matrix.

NODAL_PENALTY

Element_name = NODAL_PENALTY

m, ( pen(i, m), i = 1, ndof ) < m = 1, numat >

< connectivity data >

< terminate with a blank record >.

9.15.1 Material Properties Cards (Numat sets)

Note Variable Default Description

M [0] Material set number

PEN(1,M) [0.0] Nodal value DOF component 1

PEN(2,M) [0.0] Nodal value DOF component 2

. . .

etc . .

. . .

PEN(NDOF,M) [0.0] Nodal value DOF component NDOF

9.15.2 Element Nodal Connectivity Data

Consult Chapter 11 for details; for this element NEN = 1.

Notes . .