forked from lijiext/lammps
More doc updates
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Richard Berger
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@ -57,7 +57,7 @@ Syntax
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dim = *x* or *y* or *z*
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vshear = magnitude of shear velocity (velocity units)
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*contacts* value = none
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store contact information for each particle colliding with wall
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generate contact information for each particle
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Examples
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@ -8,7 +8,7 @@ Syntax
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.. parsed-literal::
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fix ID group-ID wall/gran/region fstyle fstyle_params wallstyle regionID [store_contacts]
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fix ID group-ID wall/gran/region fstyle fstyle_params wallstyle regionID keyword values ...
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* ID, group-ID are documented in :doc:`fix <fix>` command
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* wall/region = style name of this fix command
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@ -36,7 +36,12 @@ Syntax
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* wallstyle = region (see :doc:`fix wall/gran <fix_wall_gran>` for options for other kinds of walls)
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* region-ID = region whose boundary will act as wall
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* store_contacts = store contact information for each particle colliding with wall
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* keyword = *contacts*
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.. parsed-literal::
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*contacts* value = none
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generate contact information for each particle
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Examples
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""""""""
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@ -47,7 +52,7 @@ Examples
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fix 3 all wall/gran/region granular hooke 1000.0 50.0 tangential linear_nohistory 1.0 0.4 damping velocity region myBox
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fix 4 all wall/gran/region granular jkr 1e5 1500.0 0.3 10.0 tangential mindlin NULL 1.0 0.5 rolling sds 500.0 200.0 0.5 twisting marshall region myCone
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fix 5 all wall/gran/region granular dmt 1e5 0.2 0.3 10.0 tangential mindlin NULL 1.0 0.5 rolling sds 500.0 200.0 0.5 twisting marshall damping tsuji region myCone
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fix wall all wall/gran/region hooke/history 1000.0 200.0 200.0 100.0 0.5 1 region myCone store_contacts
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fix wall all wall/gran/region hooke/history 1000.0 200.0 200.0 100.0 0.5 1 region myCone contacts
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Description
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"""""""""""
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@ -217,30 +222,32 @@ uninterrupted fashion.
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use the same fix ID for fix wall/gran/region, but assign it a region
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with a different region ID.
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If the :code:`store_contacts` option is used, this fix will store the contact
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information for each atom that interacts with the wall. The following table
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summarizes which values are available as per-atom quantities
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(:code:`f_FIXID[Index]`) to access by various :doc:`output commands <Howto_output>`:
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If the :code:`contacts` option is used, this fix generates a per-atom vector
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with 8 columns as output, containing the contact information for owned
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particles (nlocal on each processor). All columns in this per-atom vector will
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be zero if no contact has occured. The values of these columns are listed in
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the following table:
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+-------+----------------------------------------------------+
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| Index | Value |
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+=======+====================================================+
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| 1 | Atom ID |
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+-------+----------------------------------------------------+
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| 2 | Force :math:`f_x` exerted on the wall |
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+-------+----------------------------------------------------+
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| 3 | Force :math:`f_y` exerted on the wall |
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+-------+----------------------------------------------------+
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| 4 | Force :math:`f_z` exerted on the wall |
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+-------+----------------------------------------------------+
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| 5 | :math:`\Delta x` between wall surface and particle |
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+-------+----------------------------------------------------+
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| 6 | :math:`\Delta y` between wall surface and particle |
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+-------+----------------------------------------------------+
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| 7 | :math:`\Delta z` between wall surface and particle |
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+-------+----------------------------------------------------+
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| 8 | Radius :math:`r` of atom |
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+-------+----------------------------------------------------+
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+-------+----------------------------------------------------+----------------+
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| Index | Value | Units |
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+=======+====================================================+================+
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| 1 | 1.0 if particle is in contact with wall, | |
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| | 0.0 otherwise | |
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+-------+----------------------------------------------------+----------------+
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| 2 | Force :math:`f_x` exerted on the wall | force units |
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+-------+----------------------------------------------------+----------------+
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| 3 | Force :math:`f_y` exerted on the wall | force units |
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+-------+----------------------------------------------------+----------------+
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| 4 | Force :math:`f_z` exerted on the wall | force units |
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+-------+----------------------------------------------------+----------------+
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| 5 | :math:`\Delta x` between wall surface and particle | distance units |
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+-------+----------------------------------------------------+----------------+
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| 6 | :math:`\Delta y` between wall surface and particle | distance units |
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+-------+----------------------------------------------------+----------------+
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| 7 | :math:`\Delta z` between wall surface and particle | distance units |
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+-------+----------------------------------------------------+----------------+
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| 8 | Radius :math:`r` of atom | distance units |
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+-------+----------------------------------------------------+----------------+
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None of the :doc:`fix_modify <fix_modify>` options are relevant to this fix.
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No parameter of this fix can be used with the *start/stop* keywords of the
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