**process static_torsor

Description

This post computes the static torsor equivalent to the sum of every nodal forces over a nset for each solution step. The equivalent static torsor is defined as:

(210)\[\begin{split}\left\lbrace \begin{array}{l} \mathcal{T} \end{array} \right\rbrace_O = \left\lbrace \begin{array}{l} \displaystyle \sum_{i\in\text{nset}} \vect{F}_i \\ \displaystyle\sum_{i\in\text{nset}} \vect{OO_i}\wedge\vect{F}_i \end{array} \right\rbrace_O\end{split}\]

Syntax

**process static_torsor \(~\,\) *point vector \(~\,\) *file file

where vector is the position where the momentum is computed (\(O\)). The output gives the coordinates of point \(O\), the 3 components of the resultant and the 3 components of the momentum for each time step. The output file is named file.

Example

***global_post_processing
 **nset top
 **file node
 **process static_torsor
  *point (1. 0.5 0.5)
  *file torsor.dat