Runwien: a text-based interface for the WIEN package

A new text-based interface for WIEN2k, the full-potential linearized augmented plane-waves (FPLAPW) program, is presented. This code provides an easy to use, yet powerful way of generating arbitrarily large sets of calculations. Thus, properties over a potential energy surface and WIEN2k parameter exploration can be calculated using a simple input text file. This interface also provides new capabilities to the WIEN2k package, such as the calculation of elastic constants on hexagonal systems or the automatic gathering of relevant information. Additionally, runwien is modular, flexible and intuitive.Program summaryProgram title: runwienCatalogue identifier: AECM_v1_0Program summary URL:http://cpc.cs.qub.ac.uk/summaries/AECM_v1_0.htmlProgram obtainable from: CPC Program Library, Queen's University, Belfast, N. IrelandLicensing provisions: GPL version 3No. of lines in distributed program, including test data, etc.: 62 567No. of bytes in distributed program, including test data, etc.: 610 973Distribution format: tar.gzProgramming language: gawk (with locale POSIX or similar)Computer: All running Unix, LinuxOperating system: Unix, GNU/LinuxClassification: 7.3External routines: WIEN2k (http://www.wien2k.at/), GAWK (http://www.gnu.org/software/gawk/), rename by L. Wall, a Perl script which renames files, modified by R. Barker to check for the existence of target files, gnuplot (http://www.gnuplot.info/)Subprograms used:Cat Id: ADSY_v1_0/AECB_v1_0, Title: GIBBS/CRITIC, Reference: CPC 158 (2004) 57/CPC 999 (2009) 999Nature of problem: Creation of a text-based, batch-oriented interface for the WIEN2k package.Solution method: WIEN2k solves the Kohn–Sham equations of a solid using the FPLAPW formalism. Runwien interprets an input file containing the description of the geometry and structure of the solid and drives the execution of the WIEN2k programs. The input is simplified thanks to the default values of the WIEN2k parameters known to runwien.Additional comments: Designed for WIEN2k versions 06.4, 07.2, 08.2, and 08.3.Running time: For the test case (TiC), a single geometry takes 5 to 10 minutes on a typical desktop PC (Intel Pentium 4, 3.4 GHz, 1 GB RAM). The full example including the calculation of the elastic constants and the equation of state, takes 9 hours and 32 minutes.