fix indent with atoms in the sphere (seg fault)

Hi,
I want to simulate a indentation process not only with the hard
sphere tied to a spring (if i understand the description of the fix
indent command correctly) but also with a interacting potential between
the spherical indenter and the sample. So I placed a spherical region
filled with atoms at same place as the indenter, thinking that the
atoms will move as the fix moves. But having the side keyword set to
out, i get segmentation fault(If it's set to in it works, but thats not
the effect i want have).
Thanks for any hints,
Jörg Buchwald

2011/11/25 Jörg Buchwald <[email protected]...>:

Hi,

hi joerg,

I want to simulate a indentation process not only with the hard
sphere tied to a spring (if i understand the description of the fix
indent command correctly) but also with a interacting potential between
the spherical indenter and the sample. So I placed a spherical region

why the potential? what do you expect to learn from that?

filled with atoms at same place as the indenter, thinking that the
atoms will move as the fix moves. But having the side keyword set to

no. that is not how these things work. assuming how
something works is a surefire way to get things wrong.
fix indent adds a force to atoms in the fix group. that is it.

out, i get segmentation fault(If it's set to in it works, but thats not
the effect i want have).

nobody will be able to help you debug a hypothetical
input that you have on your hard drive without having
an opportunity to reproduce your problem it, or knowing
more details about what is going wrong.

a segmentation fault is a very unspecific error
and can be caused by a lot of reasons.

Thanks for any hints,

first *you* have to produce more hints about
what is going on in your input or post a simple
example input that reproduces your problem.

cheers,
     axel.

Ok, i misunderstood the fix command. In that sense it won't make sense
to fill up the sphere with atoms, because they'll interact with
the harmonic potential. My idea was to connect the center of mass with a
spring to a moving point.
Do you have an idea how i could otherwise realize an accelerated cluster
of atoms interacting with a sample?
Thx,
Jörg