**process volume#
Description#
Calculate the volume of a group of elements (elset).
Syntax#
**process volume
Example#
****post_processing
***precision 3
***data_source mesh_only
**format Z7
**open mymesh.geof
**maps 1.
***global_post_processing
**file integ
%
% volume of the whole structure
%
**elset ALL_ELEMENT
**process volume
%
% volume of a part
%
**elset PART1
**process volume
****return