I have been trying to understand the code for calculating the ELastic constants. There is no READ_me file available therefore I am not completely able to get it. or if there could be an already existing paper which has used the code for their results and has described the flow of code
The general README file for the example folders states this:
The ELASTIC directory has an example script for computing elastic
constants at zero temperature, using an Si example. See the
ELASTIC/in.elastic file for more info.
The ELASTIC_T directory has an example script for computing elastic
constants at finite temperature, using an Si example. See the
ELASTIC_T/in.elastic file for more info.
I recommend starting with the example in the ELASTIC_T folder only after you have fully mastered and understood the 0K example in the ELASTIC folder.
The README also states that all folders in upper case contain more advanced calculations requiring some sufficient understanding of basic MD simulation techniques.
Furthermore there is some background information with references in the manual at https://docs.lammps.org/Howto_elastic.html