new input syntax for boundary conditions

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This is motivated by needing different sets of boundary conditions for
various subproblems of a single computation, namely solving the subproblems
for the corrector functions of micro-problems related to a homogenization
of porous media.

EBC = essential BC

old syntax:
ebc = {
    'Corners' : (('fixed_u', (0, 1, 2), 0.0 ),),
    'EBCGammaI' : (('fixed_p_zero', (8,), 0.0),), # % variantI
    'EBCGamma' : (('fixed_p_one', (8,), 1.0),), # % variant
}

new syntax (similar to regions, solvers, ...):
ebc_1 = {
    'name' : 'fixed_u',
    'region' : 'Corners',
    'dofs' : (0, 1, 2),
    'value' : 0.0
}
ebc_2 = {
    'name' : 'fixed_p_zero',
    'region' : 'EBCGammaI',
    'dofs' : (8,),
    'value' : 0.0
}
ebc_3 = {
    'name' : 'fixed_p_one',
    'region' : 'EBCGamma',
    'dofs' : (8,),
    'value' : 1.0
}

The used EBC could then be selected by their names and combined at wish.

Similarly should be updated also LCBC (linear combination BC) and EPBC
(periodic BC).

Original issue reported on code.google.com by robert.c...@gmail.com on 14 Feb 2008 at 9:43

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Original comment by robert.c...@gmail.com on 14 Feb 2008 at 9:43

• Changed title: new input syntax for boundary conditions

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Also: order of EBC application will be given by the lexicographical ordering of 
their
definition names ('ebc_0' < 'ebc_020' < 'ebc_10').

Original comment by robert.c...@gmail.com on 18 Feb 2008 at 2:12

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Implemented as discussed above.

Original comment by robert.c...@gmail.com on 18 Feb 2008 at 3:47

• Changed state: Fixed

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Migrated to http://github.com/sfepy/sfepy/issues/23

Original comment by robert.c...@gmail.com on 30 Jan 2012 at 10:24

• Changed state: Migrated