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All vertices for a fluid domain lie on boundaries.  This is        |
| considered to be a fatal error because control volume gradients    |
| cannot be calculated, leading to serious discretization error.     |
|                                                                    |
| A common cause for this error is a mesh which is only one          |
| element thick, without symmetry or 1:1 periodicity on the lateral  |
| boundaries.  If you have this situation, and the domain is         |
| two-dimensional, please change the lateral boundary conditions     |
| to symmetry or 1:1 periodicity.  Alternatively, for                |
| three-dimensional simulations, please ensure that your mesh        |
| has at least two elements across.        







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