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documentation/lagrit_manual/commands/boundary.txt

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+.. _boundary:
+
+&nbsp_place_holder;
+
+> **_BOUNDARY_**
+
+>
+
+>> The boundary routine operates on the current mesh object. For the nodes
+lying on the specified surface(s), it sets the specified node based attribute
+to the specified value. Optionally boundary will call the user supplied
+subroutine set_user_bounds [(see IV. e.8)](../miscell.html)
+
+>
+
+> FORMAT:
+
+>
+
+>> **boundary/dirichlet**/attr_name/[value|identifier]/surface_list
+
+where:
+
+>
+
+> **dirichlet**
+
+> is currently unused but must be specified&nbsp_place_holder;
+
+>
+
+> attr_name
+
+> is the name of the attribute to be set&nbsp_place_holder;
+
+>
+
+> value&nbsp_place_holder;
+
+> is a constant, and is the value to which the attribute is set
+
+>
+
+> identifier&nbsp_place_holder;
+
+> is a character string that will be passed to
+
+>
+
+> subroutine set_user_bounds&nbsp_place_holder;
+
+>
+
+>> > surface_list is one of:
+
+>>>
+
+>>>> > > > **-all-** (all boundary nodes)
+
+surface_name/**inclusive** (all bndry nodes on surface)
+
+surface_name/**exclusive** (all bndry nodes ONLY on surface)
+
+surface_name/ (same as exclusive)
+
+surface_name1/surface_name2/**inclusive**
+
+(all bndry nodes on the union of the surfaces)
+
+surface_name1/surface_name2/**exclusive** (default)
+
+(all bndry nodes ONLY on the intersection of the surfaces)
+
+surface_name1/surface_name2/ surface_name3/.... (same as exclusive)
+
+>
+
+>
+
+EXAMPLES:
+
+>
+
+>> **boundary**/**dirichlet**/vd_v/7.0/**-all-**/
+
+sets the attribute vd_v for all boundary nodes to be 7.0
+
+**boundary**/**dirichlet**/vi_s/8.0/pbot/   
+**boundary**/**dirichlet**/vd_v/9.0/pbot/**inclusive**/   
+sets the attribute vd_v for the nodes that are on the surface pbot to be 9.0
+
+**boundary**/**dirichlet**/vd_s/13.0/pfrt   
+sets the attribute vd_s for the nodes that are on the union of the surfaces
+pfrt and prgt to 13.0
+
+**boundary**/**dirichlet**/vi_t/12.0/prgt/   
+**boundary**/**dirichlet**/bconds/top_plane/s1,s2,s3/   
+will pass the set of nodes on the intersection of surfaces s1,s2 and s3 along
+with the string top-plane to subroutine set_user_bounds.
+