ATC package postprocessing

LAMMPS LAMMPS Mailing List Mirror
1

Dear developers of atc packages and experienced users,

I was doing a simulation (20151019 version) to estimate the 3d stress in a system and the simulation went well without any errors.

2

If the format is not described in the ATC doc pages

(note there is a lot of them in doc/USER/atc),

then you should send an email to the ATC developers

(listed in src/USER-ATC/README). I’ve CCd one

of them on this email.

Steve

3

Steve,

I appreciate you willingness to help.

I didnt get enough details from the doc/USER/atc.

I will email the rest of the Atc team as you mentioned.

Meanwhile I figured out the format and relationship between data and xyz files.

Still the encrytped files (geo, stress) and map file is a mystery to me.

cheers,

Matt.

4

Steve,

I appreciate you willingness to help.
I didnt get enough details from the doc/USER/atc.
I will email the rest of the Atc team as you mentioned.
Meanwhile I figured out the format and relationship between data and xyz
files.
Still the encrytped files (geo, stress) and map file is a mystery to me.

​there is no encryption in LAMMPS. those files are likely binary
unformatted outputs, which is usually done for grid data or frequently
written data, as the formatting into and reading from text files is quite
CPU time consuming​ (lots of calls to costly logarithms and exponentials)
and since it is more compact. outputting a double precision floating point
number in full accuracy with sufficient spacing can consume up to 25 bytes
per number, while unformatted output requires only 8 bytes. that is 3x
savings.

a quick glance at the source code reveals that there are output functions
like OutputManager::write_geometry_ensight()
and OutputManager::write_data_ensight()
which seem to output files in a specific (binary) format. ... and taking
the hint "ensight" and sticking it into google reveals, that there is a
visualization software called ensight
https://www.ensight.com/ and it doesn't take much of a guess to assume that
those files in question are written in a CFD style format natively
supported by this software.

axel.