Dear LAMMPS Users,
I am wondering if anyone more skilled than me can figure out why I get an error using MEAM Library.
I am working on a Linux environment built including MEAM styles, trying to calculate the friction force between a Silicon tip and an Aluminium substrate.
I found the MEAM potentials between these 2 elements on library.meam along with AlSiMgCuFe.meam file.
Here is the portion of the code for achieving this task:
boundary p p p
read_data data_lammps.in #input file
pair_coeff * * library.meam AlS SiS AlSiMgCuFe.meam SiS SiS AlS AlS
in which I have 4 atom types (upper surface of the tip and rest of the tip, i.e. type 1,2; surface and bottom of the surface, i.e. type 3 and 4). I called the element AlS and SiS because in AlSiMgCuFe.meam it is specified that:
"MEAM Al, Si, Mg, Cu, Fe alloy potential. use with AlS SiS MgS CuS FeS from library.meam"
When I run the simulation a WARNING appears: "The pair_style meam command is unsupported. Please use pair_style meam/c instead ".
Therefore, I changed the pair style to meam/c, obtaining this ERROR: "MEAM library error 3".
I tried to modify the name of the elements in the library file (deleting the record with the same name) using the proper names (Al and Si) on the input file, but I got the same error.
The simulation runs anyway (using meam), but I'd like to be sure that the potential are accounted properly.
It looks like the tip's atoms are not really exerting any interaction forces on the aluminium surface even at a very little distance and I would like to discard the possibility of an issue related to the pair potentials.
Thank you for any help you will provide
Andrea Mio, PhD