[Paraview] Degrees of freedom

[Samuel Key]

Doina--


At the risk of underestimating ParaView's functionalities, I can tell 
you what will work. For displaying geometry,  PV only needs Point (aka 
nodal point) x,y,z-coordinates, a Cell (aka Finite Element, ...)  type  
and for each Cell an n-tuple of Point "array locations", for example, 
EnSight-format::{1,2,4,3,7,8,} or VTK-format::{0,1,3,2,6,7}.


The VTK format uses C-language 'array offsets' for Cell connectivity 
n-tuples. The EnSight format uses FORTRAN-language array locations for 
Finite Element connectivity n-tuples. It is just the way it is.


Variables are either located at Points or in Cells (conceptually Cell 
centers). The arrays supplied for variables must span all of the Points 
or all of the Cells. (I do not know how to use or about the 
acceptability of "partially" specified variable datum sets.) For Points 
with 6-DOFs versus 3-DOFs, if you want to see the three rotational DOFs, 
use POINT DATA arrays and fill in the Phi-x, Phi-y, Phi-z values using 
zeros for at those Points without a rotation.


If you want to visually display a 2-node, 6-DOF beam's geometry (a 
curved beam or a deformed beam) , one solution is too use a VTK Cell 
type 'VTK_QUADRATIC_EDGE = 21'  for the beam. This will require you to 
add-on-the-fly to the simulation results a beam center-Point with 
x,y,z-coordinates and displacements for the beam's center Point using 
the beam's interpolation functions. (PV has a Warp Filter that will let 
you then scale up the deflections for visualization purposes.)


Should you have access to source code for the simulations, I can supply 
FORTRAN language routines that write VTK ASCII-formatted simulation 
results. (My personal preference is the EnSight format.)


--Sam




On 11/18/2017 6:12 AM, Doina Gumeniuc (224252 MAHS) wrote:
>
> Hi all!
>
> I am still learning the use of paraview and I have got to such a 
> question: How to show in a vtk input file the degrees of freedom of 
> elements? Some of the beams have 6 degrees of freedom, some of the 
> other elements...less or nothing at all. IS there any possibility?
>
> Thank you a lot in advance!
>
>
>
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