Re: [Libmesh-users] libMesh 0.7.2 released

[Roy S. <roy...@ic...>]

On Fri, 11 Nov 2011, Robert wrote:

> I am assuming that this change should help me to get my periodic BC
> problem (See thread "Change sparsity pattern of system matrix") on
> a moving mesh fixed.

I'm afraid not.  The NodeConstraints currently have the same
limitation as the DofConstraints: they only support constraints with
no offset values.  That's fine for the periodic BCs on function
values, u(left) = u(right), but it doesn't work for the periodic nodal
coordinates  x(left) = x(right) + offset_value.

The initial target for NodeConstraints is moving mesh code, but just
for hanging nodes, not periodic node displacements.
---
Roy