Dear ParaView users and developers,
I have an output file of a Finite Element code, which contains a
fluid velocity vector field. I would like to plot the values of dv/dn
on the walls of my domain. My idea was this: plot a gradient of
velocity magnitude, generate surface normals and then compute the
scalar product (grad(v),n). Unfortunately, I have several problems:
when I plot the gradient of velocity
(Filters->GradientOfUnstructuredDataSet), I have a scalar field of
gradient magnitude (I guess), but no vector field, even though
mathematically speaking, grad(scalar) results in a vector. Could you
tell me how to generate a vector field where the vector components are
(grad(v)_x,grad(v)_y,grad(v)_z) ?
Second, I don't understand why Filters->Generate Surface Normals is
disabled when I load my data file (in Ensight format). The only way of
plotting some normals is using 'glyphs', but these glyphs are then not
available in the 'Calculator' filter which I wanted to use to compute
the final scalar product (grad(v),n). One strange thing I also noticed
is that the glyphs are not plotted on a part of the domain boundary
(which is smooth).
Could you please give me a hint how to obtain the plot of dv/dn ?
Thank you.
Martin Vymazal
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