Re: [Libmesh-devel] Mesh Corruption In XDA Format

[Paul T. B. <ptb...@gm...>]

Precision of the output in xda format?

On Tue, Mar 8, 2016 at 12:27 PM, Derek Gaston <ga...@mi...> wrote:

> (Note: this is cross-posted between MOOSE and libMesh devel lists because
> it's interesting to both!)
>
> I had a user here at MIT bring me this interesting problem.  She developed
> her code last year and got good results (i.e.: it worked last year).  She
> did an internship for 6 months and came back to the code only recently came
> back to the code and her same stuff doesn't work anymore.
>
> What she is doing is writing out XDA format meshes from one simulation and
> reading them into the next simulation.  What's happening is that the XDA
> format meshes are "corrupt" for some reason.  We finally tracked it down to
> happening when her mesh gets really fine due to adaptivity.  I've been able
> to replicate this in a small MOOSE input file (runs with moose_test) that I
> have attached.
>
> The original mesh looks like this:
>
> [image: initial_mesh.png]
>
> After 5 adaptivity steps it looks like this:
>
> [image: corruption.png]
>
> To generate that I outputted the file in XDA format and then just read it
> in and converted it to Exodus.
>
> The really weird thing about this problem is that it runs just fine... and
> the Exodus output looks just fine:
>
> [image: solution.png]
>
> So the mesh is NOT actually corrupt in memory.  In addition, earlier XDA
> files look just fine.  Here it is after 4 adaptivity steps:
>
> [image: four.png]
>
> Anyone have an idea of what's going on?
>
> Derek
>
>
>
>
>
>
> ------------------------------------------------------------------------------
> Transform Data into Opportunity.
> Accelerate data analysis in your applications with
> Intel Data Analytics Acceleration Library.
> Click to learn more.
> http://makebettercode.com/inteldaal-eval
> _______________________________________________
> Libmesh-devel mailing list
> Lib...@li...
> https://lists.sourceforge.net/lists/listinfo/libmesh-devel
>
>