From e20ea968b930184bec9eb0d273caee48026f88fc Mon Sep 17 00:00:00 2001 From: Vladislav Galigerov Date: Wed, 21 Feb 2024 20:49:19 +0300 Subject: [PATCH] Add some clarifications to the doc --- doc/src/fix_wall_flow.rst | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/doc/src/fix_wall_flow.rst b/doc/src/fix_wall_flow.rst index 5fc9f5367c..b40ba9697f 100644 --- a/doc/src/fix_wall_flow.rst +++ b/doc/src/fix_wall_flow.rst @@ -66,7 +66,10 @@ N+1 walls. Each time a particle in the specified group passes through one of the transparent walls, its velocity is re-assigned. Particles not in the -group do not interact with the wall. +group do not interact with the wall. This can be used, for example, to +add obstacles composed of atoms, or to simulate a solution of complex +molecules in a one-atom liquid (note that the fix has been tested for +one-atom systems only). Conceptually, the velocity re-assignment represents creation of a new particle within the system with simultaneous removal of the particle @@ -147,6 +150,10 @@ if LAMMPS was built with that package. See the :doc:`Build package Flow boundary conditions should not be used with rigid bodies such as those defined by a "fix rigid" command. +This fix can only be used with periodic boundary conditions along the +flow axis. The size of the box in this direction must not change. Also, +the fix is designed to work only in an orthogonal simulation box. + Related commands """"""""""""""""