**process couple

Description

This post-processing computes the moment of reaction forces about a given axis.

\[\begin{split}\begin{aligned} M_x &= y F_z - z F_y \\ M_y &= z F_x - x F_z \\ M_z &= x F_y - y F_x \end{aligned}\end{split}\]

Syntax

**process couple \(~\,\) *axe direction

*axe direction

defines the moment component to compute

To calculate the moment about all three axes, one can stack three separate post-processings.

Example

****post_processing
 ***global_post_processing
  **file node
  **process couple
   *axe 3
****return