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Troubleshooting
Common causes of program failure are:
- Improperly set boundary conditions in mesh.txt. For
3D problems, a triangular surface mesh is used to set the boundary
conditions, but by default GID does NOT output these surface elements.
In GID the following procedure is necessary to force this output:
Meshing > Mesh criteria > Mesh > Surfaces, then select
all surfaces and press ESC. For 2D problems the same procedure
is required for lines.
- All volume elements must be assigned a material number, either
that of a Liquid Crystal Domain or a Dielectric. If a dielectric
region exists please ensure that it's permittivity is defined
in elastic.i. Otherwise zero permittivity is assumed,
which causes failure of the potential solver. Likewise the LC
properties must be also defined in elastic.i. Mistakenly
setting delta epsilon greater than esplow also causes problems.
- Structures must be defined so that the alignment surfaces lie
in the x-y plane. This is crucial when setting intial boundary
conditions. Alignment surfaces must be continous across the upper
and lower surfaces of LC domains.
- Alignment Surfaces must NOT be assigned above, beneath or within
dielectric regions.
- At least one electrode must be exist in the meshed structure.
- Although opposing faces to which periodic boundary conditions
are applied need not necessary be identical, when they are the
condition is more strongly enforced. In GID this can be achieved
by creating Separate Volume Contacts. However, Tetgen does not
support this feature.
This page last modified
2 June, 2006
by r.james
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