[Paraview] Calculating time-averaged shear stress

[Shuhao Wu]

I believe you're looking for the TemporalStatistics filter. Specifically 
what you want maybe something along the lines of:

   temporal_statistics = TemporalStatistics(Input=vtk_data)
   temporal_statistics.ComputeAverage = 1
   temporal_statistics.ComputeMinimum = 0
   temporal_statistics.ComputeMaximum = 0
   temporal_statistics.ComputeStandardDeviation = 0

This should make the computation slightly faster as you don't need to 
compute and store the stddev, min, and max.

Shuhao

On 2017-10-23 02:36 PM, Eslami, Parastou wrote:
> Hi  Everyone,
> 
> 
> I'm very new to Paraview and python scripting. I have a series of time dependent .vtu files and would like to
> 
>    1.  Read the vtu files for each time step
>    2.  calculate the magnitude of shear stress
>    3.  calculate time-averaged shear stress for all the elements in my geometry
>    4.  output/write a vtu file and load it back to paraview.
> 
> I think I have been able to successfully implement steps 1 and 2 (please see bellow)  but am completely clueless on how to do 3 and 4. Could anyone help me with this? I also should mention that I have tried the Temporal Statistics Filter and it seems to be working fine, but would like to have a way to do it with pythons scripting as well.
> 
> 
> Thanks,
> Parastou
> 
> 
> #### import the simple module from the paraview
> from paraview.simple import *
> import numpy as np
> #### disable automatic camera reset on 'Show'
> paraview.simple._DisableFirstRenderCameraReset()
> 
> dumm_vWSS = []
> 
> for i in range(4500, 4550, 50):
>      f = "\...\.../all_results_0" + str(i) + ".vtu"
>      print i
>      # create a new 'XML Unstructured Grid Reader'
>      all_results = XMLUnstructuredGridReader(FileName=f)
>      all_results.CellArrayStatus = ['GlobalElementID']
>      all_results.PointArrayStatus = ['GlobalNodeID', 'vinplane_traction', 'vWSS', 'average_speed', 'average_pressure', 'pressure', 'velocity', 'timeDeriv']
>      # create a new 'Calculator'
>      calculator1 = Calculator(Input=all_results)
>      calculator1.Function = ''
>      # Properties modified on calculator1
>      calculator1.ResultArrayName = 'WSS mag'
>      calculator1.Function = 'mag(vWSS)'
>      # get the data points
>      SetActiveSource(calculator1)
>      calculator1.UpdatePipeline()
>      vWSSdata=servermanager.Fetch(calculator1)
>      vWSSPoints     =vWSSdata.GetPoints()
>      vWSSPointData  =vWSSdata.GetPointData()
>      vWSSArrayData=vWSSPointData.GetArray('WSS mag')
>      dumm_vWSS.append(vWSSArrayData)
>      print dumm_vWSS
> 
> 
> 
> Parastou Eslami, PhD
> Post-doctoral Fellow, Harvard University
> Department of Radiology, Massachusetts General Hospital
> 
> 
> 
> 
> 
> 
> 
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