problem in calculating force applied by the indenter

Hi dear all,
I have a problem in calculating force applied by the indenter. i am not using fix indenter command, i applied force on the indenter using fix setforce command as shown
fix 2 dot setforce 0 0 -0.05
and the interaction force between is calculated using f_2[3] and also using
compute force dot group/group upper
both gives similar results.
My problem is that the force calculated by me is very very greater then calculated by people . the value of force calculated by different peoples for Cu is nearly 100ev/A but force i have calculated is nearly 8000 ev/A.the indenter used by me is a sphare of dimand and simulation is performed at 300K. first i thermalize the substrate for 100 peco sec then i apply the indenter. kindly help me to over come this problem, any suggestion is appriciable for me.
Regards
Muhammad Imran

Hi dear all,
I have a problem in calculating force applied by the
indenter. i am not using fix indenter command, i applied force on the
indenter using fix setforce command as shown
fix 2 dot setforce 0 0 -0.05

sorry, but this doesn't make sense. the force that the indenter
exerts would have to be more or less identical to what you assign
with fix setforce. what can you learn from that?

and the interaction force between is calculated using f_2[3] and also using
compute force dot group/group upper
both gives similar results.
My problem is that the force calculated by me is very very greater then
calculated by people . the value of force calculated by different peoples

no big surprise. have you accounted for the fact that fix setforce will
add a force to _every_ atom in the group, whereas compute group/group
will compute the _total_ force between two groups?

cheers,
     axel.