[General] Wrong Calculation of Cell Volume

olli191 · July 27, 2016, 05:24

Hello all,

for the calculation of the cell volume I use the Python Calculator on Cell Data according to

http://www.vtk.org/Bug/view.php?id=10433#c34084

and i get after Integration of the cell volumes a number like 9.5E-11 whereas the ExtractedBlock (see below) has a volume around 0.017 m³ and the Threshold estimated around 0.004 m³.

I think there is a big misunderstanding on my side how the cell volume calculation works but on the other hand there are reports that the cell area calculation at Ensight-files (here ensight gold) is buggy. My ParaView-Version is 5.0.

My Filters look like

ExtractedBlock
|
ResampleWithDataSet
|
Calculator (calculates Z-Velocities)
|
Threshold (selects only positive Z-Velocities)
|
PythonCalculator (selects Cell Volumes)
|
CellDatatoPointData
|
IntegrateVariables

Thanks for any help in advance
olli

olli191 · August 3, 2016, 05:09

After a while i think the error is a constant factor and so i relate the results to the "real" value.

July 27, 2016, 05:24	Wrong Calculation of Cell Volume	#1
olli191 New Member Join Date: Aug 2015 Posts: 5 Rep Power: 11	Hello all, for the calculation of the cell volume I use the Python Calculator on Cell Data according to http://www.vtk.org/Bug/view.php?id=10433#c34084 and i get after Integration of the cell volumes a number like 9.5E-11 whereas the ExtractedBlock (see below) has a volume around 0.017 m³ and the Threshold estimated around 0.004 m³. I think there is a big misunderstanding on my side how the cell volume calculation works but on the other hand there are reports that the cell area calculation at Ensight-files (here ensight gold) is buggy. My ParaView-Version is 5.0. My Filters look like ExtractedBlock \| ResampleWithDataSet \| Calculator (calculates Z-Velocities) \| Threshold (selects only positive Z-Velocities) \| PythonCalculator (selects Cell Volumes) \| CellDatatoPointData \| IntegrateVariables Thanks for any help in advance olli

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August 3, 2016, 05:09		#2
olli191 New Member Join Date: Aug 2015 Posts: 5 Rep Power: 11	After a while i think the error is a constant factor and so i relate the results to the "real" value.