Paraview Integrate over space & time

[John Haase]

Hi All,

I had a quick paraview question. I want to integrate some values over space and time. Using the integrate variables, I can integrate over space to get the integral at a single point in time. 

I've attached an image of what I currently have

Any suggestions?

[Alex Lindsay]

Try following the suggestions in this thread: http://marc.info/?l=paraview&m=128804494805006&w=2

My paraview is a little broken currently and it takes forever to download their binaries, so I'm hoping you can get this to work. Let me know if their are issues.

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[Alex Lindsay]

So I don't know if you've played around with this John, but I can't get beyond plotting the spatially integrated value over time, e.g. I've found it impossible to integrate the resulting (time) vs. (spatially averaged value) curve within Paraview. One thing you could do is export the time vs. spatially averaged values spreadsheet to a csv file and do the time integration yourself using your spreadsheet editor of choice.

I'm also going to email the paraview list and see if there's some obscure way of doing it within paraview that I've been unable to glean so far.

[John Haase]

Alex,

How do you get the spatially valued values for every time step? I can only get it for the current time step. I could do the time integration externally.

Regards,

John R. Haase

jha...@nd.edu

On Tue, Feb 7, 2017 at 1:46 PM, Alex Lindsay <alexlin...@gmail.com> wrote:

So I don't know if you've played around with this John, but I can't get beyond plotting the spatially integrated value over time, e.g. I've found it impossible to integrate the resulting (time) vs. (spatially averaged value) curve within Paraview. One thing you could do is export the time vs. spatially averaged values spreadsheet to a csv file and do the time integration yourself using your spreadsheet editor of choice.

I'm also going to email the paraview list and see if there's some obscure way of doing it within paraview that I've been unable to glean so far.

On 02/07/2017 10:19 AM, Alex Lindsay wrote:

Try following the suggestions in this thread: http://marc.info/?l=paraview&m=128804494805006&w=2

My paraview is a little broken currently and it takes forever to download their binaries, so I'm hoping you can get this to work. Let me know if their are issues.

On 02/07/2017 09:31 AM, John Haase wrote:

Hi All,

I had a quick paraview question. I want to integrate some values over space and time. Using the integrate variables, I can integrate over space to get the integral at a single point in time. 

I've attached an image of what I currently have

Any suggestions?

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[Alex Lindsay]

It is a little tricky. After you've performed your IntegrateVariables filter:

1. Make sure you have the `render view` active.
2. On the pipeline browser, make it so the only active "eye" is the `IntegrateVariables` filter
3. You should see a silver dot hopefully in the center of the render view.
4. At the top of the render view, click on `select points through`
5. Draw rectangle around the silver dot to select it
6. Then go up to filters and select `Plot selection over time`

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[John Haase]

Alex,

Thank you. I was wondering you you had an better resources than the Paraview wiki for programming in Paraview? Because I recorded these actions into a macro and tried to run it but, the macro threw errors instead.

Regards,

John R. Haase

jha...@nd.edu

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[Alexander Lindsay]

I've never had luck with recording actions. It's been a while since I've done really intensive things in Paraview, so I can't quite recall what I found to be the most helpful documentation. But there's the user guide: http://www.paraview.org/paraview-downloads/download.php?submit=Download&version=v5.0&type=data&os=all&downloadFile=ParaViewGuide-CE-v5.0.0.pdf

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[Alexander Lindsay]

There's also the mailing list: para...@paraview.org

[John Haase]

Alex,

The data I was getting out of that was corrupted, so I think I'm just going to use numpy to do the integration. However, I can't figure out how to get the array values. In the python shell I can get the cell data, but Googling and looking on Paraview's website I don't see how to get the data.

from paraview.simple import *

import os

import sys

import numpy as np

path = "C:\\Users\\John\\Desktop\\"

file_name = "SteadyState_out.e"

reader = ExodusIIReader(FileName=path+file_name)

tsteps = reader.TimestepValues

reader.UpdatePipeline()

cellData = reader.CellData

cellData[:]

[Array: Arp_lin, Array: Current_Arp, Array: Current_em, Array: DiffusiveFlux_em, Array: e_temp, Array: Efield, Array: EFieldAdvAux_em, Array: em_lin, Array: GlobalElementId, Array: ObjectId, Array: PedigreeElementId, Array: PowerDep_Arp, Array: PowerDep_em, Array: ProcRate_el, Array: ProcRate_ex, Array: ProcRate_iz, Array: rho, Array: tot_gas_current, Array: Voltage, Array: x]

Regards,

John R. Haase

jha...@nd.edu

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[Alex Lindsay]

Hi John,

I can't look too closely right now, but I've attached some (pretty terrible) scripts I hacked together a year ago for processing with paraview. I think the code that parallels yours is in the attached load_data.py.

Alex

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