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