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Added the flip keyword to the documentation of fix_press_langevin.

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Germain Clavier
2023-05-20 09:16:30 +02:00
parent 9440f26355
commit 68ec36b006
1 changed files with 16 additions and 1 deletions
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17
doc/src/fix_press_langevin.rst
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@ -16,13 +16,14 @@ Syntax
.. parsed-literal::
one or more keyword value pairs may be appended
keyword = *iso* or *aniso* or *tri* *x* or *y* or *z* or *xy* or *xz* or *yz* or *couple* or *dilate* or *modulus* or *temp*
keyword = *iso* or *aniso* or *tri* or *x* or *y* or *z* or *xy* or *xz* or *yz* or *couple* or *dilate* or *modulus* or *temp* or *flip*
*iso* or *aniso* or *tri* values = Pstart Pstop Pdamp
Pstart,Pstop = scalar external pressure at start/end of run (pressure units)
Pdamp = pressure damping parameter
*x* or *y* or *z* or *xy* or *xz* or *yz* values = Pstart Pstop Pdamp
Pstart,Pstop = external stress tensor component at start/end of run (pressure units)
Pdamp = stress damping parameter
*flip* value = *yes* or *no* = allow or disallow box flips when it becomes highly skewed
*couple* = *none* or *xyz* or *xy* or *yz* or *xz*
*friction* value = Alpha friction value to apply to the barostat
*temp* values = Tstart, Tstop
@ -177,6 +178,20 @@ shear pressure coupled with the tilt factors.
----------
The *flip* keyword allows the tilt factors for a triclinic box to
exceed half the distance of the parallel box length, as discussed
below. If the *flip* value is set to *yes*, the bound is enforced by
flipping the box when it is exceeded. If the *flip* value is set to
*no*, the tilt will continue to change without flipping. Note that if
applied stress induces large deformations (e.g. in a liquid), this
means the box shape can tilt dramatically and LAMMPS will run less
efficiently, due to the large volume of communication needed to
acquire ghost atoms around a processor's irregular-shaped subdomain.
For extreme values of tilt, LAMMPS may also lose atoms and generate an
error.
----------
The *friction* keyword sets the friction parameter :math:`\alpha` in the
equations of movement of the barostat. All the barostat use the same value.