Molecular dynamics calculations: Difference between revisions

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|          ||colspan="4" style="text-align: center;"| Thermostat ||
|          ||colspan="4" style="text-align: center;"| Thermostat ||
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|  Ensemble || Andersen | Nose-Hoover | Langevin | Multiple Andersen||   
|  Ensemble || Andersen || Nose-Hoover || Langevin || Multiple Andersen||   
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| NVE || yes || yes || yes || no  ||   
| NVE || yes || yes || yes ||   ||   
|-
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| NVT || yes || yes || yes || yes ||   
| NVT || yes || yes || yes || ||   
|-
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| muVT || yes || yes || yes || yes ||
| muVT || yes || yes || yes || ||
|-
|-
| NPT || yes || no || yes  || yes ||   
| NPT || no || no || yes  || ||   
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Revision as of 09:10, 29 May 2019

Compilation

First of all to run molecular dynamics calculation VASP has to be compiled using the -Dtbdyn precompiler flag in the makefile.include file. A sample input using this tag would look like this:

CPP     = $(CPP_) -DHOST=\"IFC9_fftw\" \
          -Dkind8 -DNGXhalf  -DCACHE_SIZE=12000 -DPGF90 -Davoidalloc  \
          -Dtbdyn

Main INCAR tags

  • IBRION=0: Molecular dynamics calculations are enabled by setting the IBRION tag to 0.
  • MDALGO: This tag selects the type of molecular dynamics calculations that is going to be executed (regular equations of motion, metadynamics etc.). It also includes the choice of ensemble, thermostat and barostat.


Table of Ensembles

Thermostat
Ensemble Andersen Nose-Hoover Langevin Multiple Andersen
NVE yes yes yes
NVT yes yes yes
muVT yes yes yes
NPT no no yes