There are three commands which allow one to examine the forces applied to the system. The form of them is:

     ELMFORCE, :ELE_NAME  -OPTIONS

     LDGFORCE, LG_NAME, NODE_NAME(1),  .... NODE_NAME(n), -OPTIONS

The first two of these commands will result in the computation of the forces which act on either the vertices of an element or the nodes of a load group during the process. These forces are computed in the post-processor, so the time step of the computation is that at which the forces are computed.

The ELMFORCE command is used for elements with two vertices, and the LDGFORCE command is used for generalized plate elements or load groups. For an ELMFORCE command, forces will be computed at the two end nodes of all elements which are selected by the selector :ELE_NAME.

The LDGFORCE command operates somewhat differently. Here, one can select only a single group, LG_NAME. The other data on this command is a set of node names, NODE_NAME(i). If this data is specified, then the forces will be computed at the specified nodes. The computation of force at the specified nodes is accomplished by first computing a force applied to the element. A least square fit is then performed to reduce this total force and moment to forces at the specified nodes.

The available options for both commands are:

     -EVENTS, E_BEG, E_END, E_INC

     -FORCE, FORCE_NAME(1), ....., FORCE_NAME(n)

     -MAG_DEFINE, A(1), .. A(n)

Here, E_BEG and E_END are the beginning and ending event numbers for which the results will be computed, and E_INC is an event increment. Also, FORCE_NAME(i) is a selector which selects forces from the list: WEIGHT , CONTENTS, BUOYANCY, WIND , V_DRAG , R_DRAG , WAVE , SLAM , W_DRIFT , CORIOLIS, DEFORMATION, EXTRA , APPLIED , INERTIA , A_INERTIA, C_INERTIA, FLEX_CONNECTORS, RIGID_CONNECTORS, and TOTAL . If this option is omitted, only the total force will be computed. The meaning of these forces can be found in the section of FORCES. The last option defines how the "Magnitude" is computed. You can have one, two or three A(i) and each on must be either X, Y, or Z. If you specify all three (the default) then the magnitudes will be the length of the vectors. Alternatively, the magnitude will be the length of the vector projected on two either a line (if one is specified) or a plane. For example

     -MAG_DEFINE X Y

will give you the length of the vector projected onto the X-Y plane. An additional option:

     -BODY, :BODY_SEL

is used to specify the bodies for which forces will be reported.

The corresponding form of the REPORT command is:

     REPORT, -OPTIONS

The only option available for reporting is:

     -EVENTS, E_BEG, E_END, E_INC