add vtk streamlines of the fluid velocity field

[mvanzulli]

Add vtk automatic generator for fluid stream lines when a velocity function is declared.

[jorgepz]

Good idea!

[jorgepz]

We could do it after the analysis is done and we compute a box in the space where the structure is included...then compute the velocities in that box....

[mvanzulli]

We can use StremLinesRepresentation plugin

Here is an simple way to test this new feature:

1. Load the plugin “StreamLinesRepresentation”, enable the AutoLoad checkbox for it and restart ParaView (if you don’t, stream lines will not correctly animate).
2. Create a “Wavelet” source. Apply a “Gradient” filter on it.
3. Switch representation from “Outline” to “Stream Lines”.
4. Play with the StreamLines options in the Representation panel.
5. Change the Coloring array – see Figure 3.

[mvanzulli]

The file to reproduce the example you can change de .png for .vtk

# vtk DataFile Version 2.0
Cube example
ASCII
DATASET STRUCTURED_POINTS
DIMENSIONS 3 3 3
ORIGIN 0 0 0
SPACING 1 1 1
POINT_DATA 27
SCALARS scalar_name float 1
LOOKUP_TABLE default
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
11.0
12.0
13.0
14.0
15.0
16.0
17.0
18.0
19.0
20.0
21.0
22.0
23.0
24.0
25.0
26.0
27.0
VECTORS vector_name float
1.0 27.0 1.0
2.0 26.0 2.0
3.0 25.0 3.0
4.0 24.0 4.0
5.0 23.0 5.0
6.0 22.0 6.0
7.0 21.0 7.0
8.0 20.0 8.0
9.0 19.0 9.0
10.0 18.0 10.0
11.0 17.0 11.0
12.0 16.0 12.0
13.0 15.0 13.0
14.0 14.0 14.0
15.0 13.0 15.0
16.0 12.0 16.0
17.0 11.0 17.0
18.0 10.0 18.0
19.0 9.0 19.0
20.0 8.0 20.0
21.0 7.0 21.0
22.0 6.0 22.0
23.0 5.0 23.0
24.0 4.0 24.0
25.0 3.0 25.0
26.0 2.0 26.0
27.0 1.0 27.0

[mvanzulli]

This how it should look like:

animation.mp4

[jorgepz]

pretty nice. i think that we can still discuss the options for this before implementing it in ONSAS. at some onsas meeting we can talk aboutit. i will write it down in the future meeting agenda!