mean value for every slice in a certain direction

ParaView Support
1

Hi there,

I have a finished OpenFOAM Simulation of a pipe which extrudes on the y axis.
Since it’s a turbulent simulation plotting over line doesn’t make sense because of the occurrence of Kármán vortex street. So I want to calculate the average in x and z direction for every y and plot that as a line plot over y.

I have gotten so far:

  1. create a slice on a set position y
  2. use integrateVariables Filter to get a sum as well as the area
  3. use calculator to do sum/Area

So far so good but I want this (or anything which gives me the required output) to happen for every position in y. Placing hundreds of slices isn’t fun after all. Any suggestions?

2

This is a perfect use for Python scripting in ParaView. Set up your Slice → Integrate Variables → Calculator pipeline and adjust the slice’s position in a for loop to compute the quantity of interest. You’ll then have to save the computed values into a vtkTable object, then create a Trivial Producer source and set the data on that source. You should then be able to plot the data. Caveat: this won’t work if you are using ParaView in client/server mode.

Another way is to write a Programmable Filter that computes this quantity and performs the iteration described above all using VTK filters. The output type of this filter should be vtkTable which you can plot.

3

Hi there

And thank you very much for the help.

Unfortunately my knowledge on python is very basic at best and I never used that function in ParaView so far. Of course I am happy to learn.
Is there a similar structure of a for loop in paraView I can look into?