hello,

I have been compress my model by add a force to the set " wall" in the Z direction, and then i count the force of the set "wall", but the forceZ got is fluctuate heavy. the average force is different to the adding force. why?

add force by this :    

ExternalForceX => 0,
    ExternalForceY => 0,
    ExternalForceZ => -1, 
    ExternalForceStrength => 200,

count force by this:

my \\\$forceX=0;
my \\\$forceY=0;
my \\\$forceZ=0;

foreach my \\\$atoms(@\\\$atoms)
{
 my \\\$Force = \\\$atoms->Force; 
 
   
   \\\$forceX = \\\$forceX+\\\$Force->X;
   \\\$forceY = \\\$forceY+\\\$Force->Y;
   \\\$forceZ = \\\$forceZ+\\\$Force->Z;

}