[Paraview] Unstructured rectilinear mesh vs legacy vtk format

[kenichiro yoshimi]

Hi Aniruddha,

I think the reason why the data looks discontinuous is that it is
defined as cell data. So the easiest way is to use "Point Data to Cell
Data" filter to convert from cell data to point data, which is using a
very basic straight averaging.

Best Regards

2018-05-20 3:30 GMT+09:00 Aniruddha Panda <aniruddhamit at gmail.com>:
> I have a cartesian grid on two different codes, one uses the legacy format
> to write the data in vtk format where the co-ordinates of equidistant points
> in x y and z directions are used and the associated velocity (or any other
> state variable) values are written.
>
>
> Whereas in the code which uses the unstructured dataset the each quadrant
> extents are written and the associated cell data is written. Later the idea
> is to have adaptive mesh refinement on this.
>
> When I visualise both the files ( lets say for flow through a square duct,
> pic attached ) I see a smooth representation that paraview automatically
> calculates for the mesh in case of vtk whereas it appears like a
> discontinuous data in case of vtu ( i assume vtu does lead to a
> discontinuous field) . May I know if there is a smoothing filter which
> allows me to interpolate the data onto an equidistant point cloud in all
> directions so as to have smooth profile in my postprocessing.
>
> Figure1. vtk flow through a square duct
> Figure2 vtu flow through a square duct
> Figure3 the velocity profile across the diagonal of the slice ( from vtk )
> Figure4 the velocity profile across the diagonal of the slice ( from vtu)
>
> ---------------------------------
>
> With thanks & regards
>
> Aniruddha
>
>
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