Delete fix_wall_diffusive.txt

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fix wall/diffusive command :h3

[Syntax:]

fix ID group-ID wall/diffusive face pos temp velx vely velz keyword value ...

:pre

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

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

one or more face/arg pairs may be appended :l

face = {xlo} or {xhi} or {ylo} or {yhi} or {zlo} or {zhi} :l

  {xlo},{ylo},{zlo} pos = EDGE or constant or variable

    EDGE = current lo edge of simulation box

    constant = number like 0.0 or -30.0 (distance units)

    variable = "equal-style variable"_variable.html like v_x or v_wiggle

    temp = wall temperature

    velx, vely, velz = wall velocity along x, y, z directions

  {xhi},{yhi},{zhi} pos = EDGE or constant or variable

    EDGE = current hi edge of simulation box

    constant = number like 50.0 or 100.3 (distance units)

    variable = "equal-style variable"_variable.html like v_x or v_wiggle 

    temp = wall temperature 

    velx, vely, velz = wall velocity along x, y, z directions:pre

zero or more keyword/value pairs may be appended :l

keyword = {units} :l {units} value = {lattice} or {box}

         {lattice} = the wall position is defined in lattice units

          {box} = the wall position is defined in simulation box units :pre :ule

[Examples:]

fix ywalls all wall/diffusive xlo EDGE 300 0.1 0.1 0 xhi EDGE 200 0.1 0.1 0

fix ywalls all wall/diffusive xlo 300 0.1 0.1 0 ylo 300 0.1 0.1 0 units box:pre

[Description:]

In the wall/diffusive model, the atoms are fully thermalized by the wall and

reflected diffusively. The post collision velocity distribution is a equilibrium

distribution at the wall. The use of this stochastic model ressembles to

wall/reflect but with four additional parameters the wall temperature and the

wall velocity along 3 directions x, y, z.

The {units} keyword determines the distance units used to define a wall position

A {box} value selects standard distance units as defined by the

"units"_units.html command, e.g. Angstroms for units = real or metal. 

A {lattice} value means the distance units are in lattice spacings. The

"lattice"_lattice.html command must have been previously used to define the

lattice spacings.

[Restrictions:]

As extension of wall/reflect, this fix has has the same limitation as the the

wall/reflect. Any dimension (xyz) that has a wall must be non-periodic. It

shoudld not be used with rigid bodies such as those defined by a "fix rigid"

command. 

[Related commands:]

"fix wall/reflect"_fix_wall_reflect.html, "fix

"wall/maxwell"_fix_wall_maxwell.html, "fix wall/cl"_fix_wall_cl.html

[Default:] none

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