orientation of group of atoms

Hi,
I am doing solidification simulation in LAMMPS. I am taking one solid region i.e., copper block. On the top of the copper block the liquid region is Aluminum. In every simulation i have changed the orientation of lattice in copper block. After the complete of solidification i want to see how the orientation of the liquid block atoms changes with respect to solid block.
Can anyone knows how to know the change in orientation. please tell me.

Hi,
   I am doing solidification simulation in LAMMPS. I am taking one solid
region i.e., copper block. On the top of the copper block the liquid region
is Aluminum. In every simulation i have changed the orientation of lattice
in copper block. After the complete of solidification i want to see how the
orientation of the liquid block atoms changes with respect to solid block.

Can anyone knows how to know the change in orientation. please tell me.

i don't understand the question. which orientation do you want to change?

from your description above it sounds more like you want to see, if there
*is* a preferred orientation. to do that without making any assumptions
is a non-trivial issue. different people may have different suggestions and
also, you can use just visual observation of your system. one of the things
that you can try is to use the CNA compute to try and determine the local
crystal system and then with that knowledge write a small script/program
to triangulate the corresponding unit cell orientations.

hopefully, others can chime in with alternate suggestions.

cheers,
     axel.

Mu question is that
I have created two regions. one region is solid copper and another region is liquid aluminum. The two regions are attached in one simulation box. The liquid region is on the top of the solid region. In this simulation i created the the atom having different orientation in the solid region. In the liquid region orientation of atom are in default direction. After complete solidification i want to see how the orientation of atom in the liquid region changes with respect to solid region.

Mu question is that
       I have created two regions. one region is solid copper and another
region is liquid aluminum. The two regions are attached in one simulation
box. The liquid region is on the top of the solid region. In this simulation
i created the the atom having different orientation in the solid region. In
the liquid region orientation of atom are in default direction. After
complete solidification i want to see how the orientation of atom in the
liquid region changes with respect to solid region.

have you actually read the second part of my reply?

have you actually done a simulation of this kind and
checked empirically/visually whether there is a preferred
orientation at all?

have you thought about the problem of having first to
identify a sufficient regularity in your solidified liquid
to be able to even *talk* about something of an orientation,
let alone measure it?

axel.

And to do what Axel is saying, dump out the final
config of the atoms, and check, using your own tool
or visually what the orientation is.

I.e. you can post-process this from the dump file yourself.

Steve