Time to NodalValueSampler

[agniksr]

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Question

So i am trying to output the temperature at certain nodes in my mesh file as below, for n timesteps. To get all the data in one file, i used contains_complete_history = true. I want to plot the Temperature vs time for 4 or 5 radii (x^2+y^2), for a fixed z (= 0 8 16 24 32 40).
However, when i open the csv file, the same node id is not present 10 times, for instance the node id 2 is only present once. Is the node id updated after every iteration?
Any idea how i can obtain the time along with the other vpp values, so that it is easier to identify the state of the nodes at a certain timestep

[VectorPostprocessors]
   [./AllElementTemp]
     type = NodalValueSampler
     variable = 'T'
     sort_by = id
     contains_complete_history = true
     use_displaced_mesh = true
     boundary = 'bottom z8 z16 z24 z32 top'
   [../]
[]

[GiudGiud]

Is the node id updated after every iteration?

This is not the case by default, but you are using displaced meshes so that could happen if repartitioning and consequently re-numbering happened in parallel.

 contains_complete_history = true

Using different files, one for each time step, is less messy than this option.
Especially sorting by id rather than than time, I don't know what the output will be ordered like

[agniksr]

Okay thank you for the answer. I changed it to false and made a script file to sort through the multiple files.

[jessecarterMOOSE]

@GiudGiud Is there a way to get time to be output to the VPPfile?

[GiudGiud]

not that I can see.
the timestep is in the name of the csv
otherwise you can add time as an auxvariable

[AuxVariables/time]
[]
[AuxKernels/set_time]
  type = ParsedAux
  expression = 't'
use_xyzt = true
[]

[jessecarterMOOSE]

Yeah I'm after time not timestep. The AuxVariable worked 👍