[Paraview] Degrees of freedom

[Doina Gumeniuc (224252 MAHS)]

Hi Samuel,


Thank you for your reply.

I have different frequencies, 50 in total. If I use FIELD POINT DATA and then for arrayname 1 and so on, I use the Freq1, Freq2... then for 6Dofs, I use vectors in x,y,z for translation and Phi-x,Phi-y, Phi-z for rotation.... would it make sense in paraview? I can hopefully then wrap by vectors using the data for each frequency.


Thank you! I hope I was clear.

________________________________
From: ParaView <paraview-bounces at paraview.org> on behalf of Samuel Key <samuelkey at bresnan.net>
Sent: November 18, 2017 7:00:51 PM
To: paraview at paraview.org
Subject: Re: [Paraview] Degrees of freedom


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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