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Theofilos,<br>
<br>
These may not be the most elegant solutions, but they are simple and
will work very nicely.<br>
<br>
ParaView is capable of reading multiple datum sets and displaying
the results either in the same window or in side-by-side windows
(and, probably both scenarios at the same time).<br>
<br>
(1) Write out two separate results datum sets that are independently
displayable. The first results datum set with mid-edge nodal points
but without pressure at the vertex nodal points, and the second
results datum set without the mid-edge nodal points but with
pressure at the vertex nodal points. <br>
<br>
(2) When writing out a results datum set, generate a pressure at the
mid-edge nodal points by averaging the pressure found at the edge's
end-points.<br>
<br>
(3) Suggestion #2 can be extended. Since ParaView, at a fundamental
level, was designed to display either "centered" cell-values and
point-values, and you very likely have 20-node quadratic(?)
hexahedrons with cell-values "centered" at a 2x2x2 Gaussian
quadrature in which you are interested in seeing results, a painless
way to get a single, simple displayable results datum set is, at the
time you write out a given 20-node brick, break the 20-node
quadratic brick and its cell data into eight 8-node linear bricks.
(A similar effort is required when writing out point coordinates and
point values.)<br>
<br>
When you get to ParaView, there will be no visual confusion as to
which Gauss point result is located where in the finite element.
While the display is not quadratic in its rendering, eight linear
bricks for each quadratic brick is a pretty decent representation.
It will get you started using ParaView.<br>
<br>
Quite possibly someone else can explain how ParaView renders
quadratic data and elements.<br>
<br>
Samuel Key<br>
FMA Development, LLC<br>
1005 39th Ave NE<br>
Great Falls, Montana 59404<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">On 12/9/2014 7:55 AM, Teo Ioannis
wrote:<br>
</div>
<blockquote
cite="mid:CAOX0pDf9e9E2Q_EmobK3W5Y_AQkqMOKJMhH5P_u--7jWLHMRRw@mail.gmail.com"
type="cite">
<div dir="ltr">I would like to ask if it is possible to display
scalar, vector or tensor values at distinct nodes in a finite
element mesh.
<div><br>
</div>
<div>To make things clearer, there exist finite element
formulations where not all nodes have the same number of
degrees of freedom. Consider the case of a 20 node hexahedral
element. In a so called u-p formulation all 20 nodes have 3
displacement degrees of freedom (one for each x, y, z axis)
but only the 8 corner nodes have pressure degrees of freedom. </div>
<div><br>
</div>
<div>For this particular case, i know how to display the vector
of displacements for all the nodes. But since only the corner
nodes of each hexahedron have pressure degrees of freedom how
can I instruct paraview to 'see' that only these nodes have
the pressure scalar values and make the correct color
interpolation?</div>
<div><br>
</div>
<div>Thank you very much.</div>
<div>Theofilos Manitaras</div>
</div>
<br>
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<br>
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