On Tue, 16 Nov 2010, Cody Permann wrote:

> As promised, I have mocked up an example in libMesh to test out the
> periodic level 1 rule patch.

Thanks!

Looking over that patch: I don't like the swath of ifdef-else macros
required around the uses of topological neighbor.  There's no great
solution here, since we can't be sure PeriodicBoundaries exists
without a macro to define it, but is there any way to make it a little
less ugly?  Maybe refactor those six calls into a single inline 
MeshRefinement::topological_neighbor(Elem&, int), with a single ifdef
and dispatch in there?

> I have modified ex10 adding wrap-around boundaries so you can see
> the level 1 rule holding on those periodic boundaries as the Mesh
> adapts.  I have been running the problem with 90 timesteps and an
> output_frequency of 1 so I can watch the mesh very closely.  Oh, I
> also took the liberty of changing the mesh slightly so that I could
> write out the result with Exodus.  It's not using that
> "Triangle/Quad" mesh anymore.

Fair enough.  One of these days we need to finally implement hybrid
mesh output with Exodus, though.

> Everything seems to be working just fine.  There is one more mystery
> which I cannot figure out.  I am forced to clear the point locator
> class manually in each adaptivity step before I use it or I end up
> with data corruption and a seg fault in the Point Locator Tree in
> the middle of the mesh refinement algorithm.  I'm not sure if this
> is an indication that I'm doing something wrong or not.  Everything
> works fine as long as I start with a clear locator each timestep.

I'll check it out.

Thanks,
---
Roy

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