documentation for fix_wall_region morse

[Syntax:]

fix ID group-ID wall/region region-ID style epsilon sigma cutoff :pre

ID, group-ID are documented in "fix"_fix.html command

wall/region = style name of this fix command

region-ID = region whose boundary will act as wall

style = {lj93} or {lj126} or {lj1043} or {colloid} or {harmonic}

epsilon = strength factor for wall-particle interaction (energy or energy/distance^2 units)

sigma = size factor for wall-particle interaction (distance units)

cutoff = distance from wall at which wall-particle interaction is cut off (distance units) :ul

fix ID group-ID wall/region region-ID style epsilon sigma cutoff args ... :pre

ID, group-ID are documented in "fix"_fix.html command :ulb,l

wall/region = style name of this fix command :l

region-ID = region whose boundary will act as wall :l

style = {lj93} or {lj126} or {lj1043} or {morse} or {colloid} or {harmonic} :l

epsilon = strength factor for wall-particle interaction (energy or energy/distance^2 units) :l

sigma = size factor for wall-particle interaction (distance units) :l

cutoff = distance from wall at which wall-particle interaction is cut off (distance units) :l

args = :l

  alpha (width parameter), if style = {morse}

  {none}, if style = {lj93/lj126/lj1043/colloid/harmonic} :pre

[Examples:]

fix wall all wall/region mySphere lj93 1.0 1.0 2.5 :pre

fix wall all wall/region mySphere lj93 1.0 1.0 2.5

fix wall all wall/region box_top morse 1.0 1.0 3.0 1.5 :pre

[Description:]

:c,image(Eqs/fix_wall_lj1043.jpg)

for style {wall/morse}, the energy E is given by the Morse potential:

:c,image(Eqs/pair_morse.jpg)

where {r_0 = sigma} and {D_0 = epsilon}.

For style {colloid}, the energy E is given by an integrated form of

the "pair_style colloid"_pair_colloid.html potential:

"fix wall/lj93"_fix_wall.html,

"fix wall/lj126"_fix_wall.html,

"fix wall/lj1043"_fix_wall.html,

"fix wall/colloid"_fix_wall.html,

"fix wall/harmonic"_fix_wall.html,

"fix wall/gran"_fix_wall_gran.html

[Default:] none