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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