83 lines
2.4 KiB
ReStructuredText
83 lines
2.4 KiB
ReStructuredText
.. index:: fix smd/wall_surface
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fix smd/wall_surface command
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============================
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Syntax
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""""""
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.. code-block:: LAMMPS
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fix ID group-ID smd/wall_surface arg type mol-ID
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* ID, group-ID are documented in :doc:`fix <fix>` command
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* smd/wall_surface = style name of this fix command
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* arg = *file*
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.. parsed-literal::
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*file* = file name of a triangular mesh in stl format
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* type = particle type to be given to the new particles created by this fix
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* mol-ID = molecule-ID to be given to the new particles created by this fix (must be >= 65535)
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Examples
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""""""""
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.. code-block:: LAMMPS
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fix stl_surf all smd/wall_surface tool.stl 2 65535
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Description
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"""""""""""
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This fix creates reads a triangulated surface from a file in .STL
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format. For each triangle, a new particle is created which stores the
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barycenter of the triangle and the vertex positions. The radius of
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the new particle is that of the minimum circle which encompasses the
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triangle vertices.
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The triangulated surface can be used as a complex rigid wall via the
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:doc:`smd/tri_surface <pair_smd_triangulated_surface>` pair style. It
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is possible to move the triangulated surface via the
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:doc:`smd/move_tri_surf <fix_smd_move_triangulated_surface>` fix style.
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Immediately after a .STL file has been read, the simulation needs to
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be run for 0 timesteps in order to properly register the new particles
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in the system. See the "funnel_flow" example in the MACHDYN examples
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directory.
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See `this PDF guide <PDF/MACHDYN_LAMMPS_userguide.pdf>`_ to use Smooth Mach
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Dynamics in LAMMPS.
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Restart, fix_modify, output, run start/stop, minimize info
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"""""""""""""""""""""""""""""""""""""""""""""""""""""""""""
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Currently, no part of MACHDYN supports restarting nor
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minimization. This fix has no outputs.
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Restrictions
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""""""""""""
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This fix is part of the MACHDYN package. It is only enabled if
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LAMMPS was built with that package. See the :doc:`Build package <Build_package>` page for more info.
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The molecule ID given to the particles created by this fix have to be
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equal to or larger than 65535.
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Within each .STL file, only a single triangulated object must be
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present, even though the STL format allows for the possibility of
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multiple objects in one file.
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Related commands
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""""""""""""""""
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:doc:`smd/triangle_mesh_vertices <compute_smd_triangle_vertices>`,
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:doc:`smd/move_tri_surf <fix_smd_move_triangulated_surface>`,
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:doc:`smd/tri_surface <pair_smd_triangulated_surface>`
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Default
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"""""""
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none
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