Subtract from one slice result to another slice result

[limpideyes (Mary)]

Dear ParaViewers,

I have got a question about subtracting slice results. I have two simulation results: results.foam-1 and results.foam-2. And I sliced those results at 1.5m of Z axis for each: Slice1 and Slice2.

Slice1 from results.foam1

Slice2 from results.foam2

I want to have the result that Slice 2 is subtracted by Slice 1. So, I’d visualise the difference of Umagnitudes between them. And I’d represent Umagnitude based on Cells, not points.

Do I have to do with calculator filter or python calculator filter? If so, how can I do that? Can anyone please let me know the fomula for the calculator or python calculater?

Please help.

[Kenichiro-Yoshimi (Kyoshimi)]

If the geometries in Slice1 and Slice2 match exactly, including the order of Cell Id, apply the AppendAttributes filter and then use the Calculator filter to take the difference “U-U_input_1” of the Vectors of the Cell Data.

If only the order of Cell Id is different between Slice 1 and Slice 2, you should take the difference to Point Data instead of Cell Data in the Calculator filter, and then apply the PointDatatoCell Data filter.