I see. Do you have a reference or example on how this combination is put 
together?

Miguel

From: John Peterson <[email protected]<mailto:[email protected]>>
Date: Thursday, November 10, 2016 at 12:19 PM
To: Miguel Salazar <[email protected]<mailto:[email protected]>>
Cc: David Knezevic 
<[email protected]<mailto:[email protected]>>, 
"[email protected]<mailto:[email protected]>"
 
<[email protected]<mailto:[email protected]>>
Subject: Re: [Libmesh-users] Implementing rigid body modes



On Thu, Nov 10, 2016 at 1:14 PM, Salazar De Troya, Miguel 
<[email protected]<mailto:[email protected]>> wrote:
That’s exactly what I was doing. I am playing with the example 
https://github.com/libMesh/libmesh/blob/master/examples/systems_of_equations/systems_of_equations_ex7/systems_of_equations_ex7.C
 where the mesh is built with HEX27, but the finite element is first order 
lagrange. Why is there this mismatch? I didn’t know that meshes could have an 
order, I thought it was up to the finite element space.

There are first and second order geometric elements and first and second order 
finite elements in libmesh.

SECOND geometric + FIRST FE combo is allowed, but not ever node will have a dof 
associated with it.

FIRST geometric + SECOND FE is not allowed for Lagrange elements.

--
John
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