[MOAB-dev] [EXTERNAL] Re: [CELS WordPress Sites] MOAB DoF numbering

[Mahadevan, Vijay S.]

Ok so if you are using DMMoab, then:

> So node ID 0 maps to DoFs 0,1,2; node ID 1 maps to DoF 3,4,5; etc.? Or is that not the case in general?

This is in general correct. This is the blocked numbering. There is also an option to turn this off and get an interlaced numbering where all Dofs of first field are arranged first, then next field etc. Such numbering really comes back to the type of solver and preconditioner that you want to use.

Hope that helps.

Best,
Vijay

On Jun. 1, 2021 18:02, "Warner, James E. (LARC-D309)" <james.e.warner at nasa.gov> wrote:
Hi Vijay,

Sorry about that – we are calling MOAB through PETSc with the DMMoab interface (DMMoabLoadFromFile, DMMoabGetDofs, etc.).

-Jim

From: "Mahadevan, Vijay S." <mahadevan at anl.gov>
Date: Tuesday, June 1, 2021 at 5:57 PM
To: "Warner, James E. (LARC-D309)" <james.e.warner at nasa.gov>
Subject: [EXTERNAL] Re: [CELS WordPress Sites] MOAB DoF numbering

Hi Jim,

MOAB has no notion of DoF numbering. Any and all numbering are maintained on a layer above by the user. This is the case unless you are using something like DMMoab from PETSc where I have code to generate numbering automatically depending on field descriptions.

So if you can give better context to your question, I can give you the right answer/pointers.

Vijay

On Jun. 1, 2021 17:41, Jim Warner <james.e.warner at nasa.gov> wrote:
Hello,

Quick question about MOAB degree of freedom (DoF) numbering - is it safe to assume that the DoFs are ordered consistently with the node ID numbers? So node ID 0 maps to DoFs 0,1,2; node ID 1 maps to DoF 3,4,5; etc.? Or is that not the case in general? Let me know, thanks!

-Jim