SPH Dataset Interpolator - usage and results export

[FEngineer]

Hi, following this thread: How to add temperature data for external mesh? I’m testing the possibility to interpolate data from a .csv file to a mesh. I opened the results of a dummy FEA to import the mesh and used the SPH Dataset Interpolator filter to apply temperature values read from a .csv file containing coordinates (not aligned with mesh nodes, some points even offset above the surface a bit) to the mesh.

The first issue is that the interpolated values seem too low. For example:

As you can see, that data point from .csv has a temperature of 80 degrees. But the midside mesh node close to it (around 0.58 mm, according to the Ruler tool) has a temperature of just 16 degrees after the interpolation. The Spatial Step parameter is set to 2 so it should be sufficient (and larger values don’t really help). Btw. does this parameter correspond to the radius of the sphere within which the search for mesh nodes is performed or is it something more complicated ?

Another problem is that I don’t know how to properly export the following data:

node ID, temperature

for nodes with non-zero temperatures. IDs aren’t normally available as a result dataset but Find Data can show them. However, I can’t copy the contents of its table (I set T to 0 and invert the selection to exclude nodes with 0 temperature). Furthermore, ParaView changes the node numbering by starting from 0 while the original numbering starts from 1. Is it possible to override this change done by ParaView ?

I attached the files here:
test.vtk (8.1 KB)
test.csv (88 Bytes)
test.pvsm (467.1 KB)

[FEngineer]

@FEngineer

Another problem is that I don’t know how to properly export the following data:

node ID, temperature

for nodes with non-zero temperatures. IDs are not normally available as a result dataset but Find Data can show them. However, I can’t copy the contents of its table (I set T to 0 and invert the selection to exclude nodes with 0 temperature).

As a workaround, I applied the Generate Ids filter then selected all nodes on the face next to the imported points, used Extract Selection and finally File → Save Data → csv with PointIds and T in Choose Arrays To Write. Another way would be to use Find Data on the result of Generate Ids, set T to 0, invert the selection, click Extract and then save the data.

So, apart from that node renumbering, the main problem that still persists is this one:

@FEngineer

As you can see, that data point from .csv has a temperature of 80 degrees. But the midside mesh node close to it (around 0.58 mm, according to the Ruler tool) has a temperature of just 16 degrees after the interpolation.

Maybe I’m doing something wrong. I don’t think that the temperature should be so low.

I also changed the coordinates of that imported point number 4 shown in the previous post to make it lie in the same spot as node 66 (also shown above). I would expect that node to have a temperature of 80 degrees after interpolation but it’s 17 degrees instead so clearly something is not right here. Are there any important settings that could help ?