View source for OpenFOAM/C2/Basic-Post-Processing-using-ParaView/English

<span style="color:#000000;">Tutorial </span>: Basic Post-Processing using ParaView

Script : Subhasree Basu

Narration : Deepa Vedartham

Keywords: OpenFOAM-5, Velocity vectors, Stream lines, slice, clip, ParaView, Spoken Tutorial



{| border=1
|-
| '''Visual Cue'''
| '''Narration'''
|-
| Slide 1 : Title
| Hello and welcome to the spoken tutorial on '''Basic Post-Processing using ParaView'''.

|-
| Slide 2 : Learning Objectives
| In this tutorial, we will learn some basic visualization techniques in '''ParaView'''.

|-
| Slide 3 : Learning Objectives
| Under this we will learn:
# '''Variable visualization'''
# '''Velocity vector visualization'''
# '''Streamlines''' visualization
# '''Slice''' and '''Clip filters
'''
|-
| Slide 4 :

System Requirement
| To record this tutorial I am using
* '''Ubuntu Linux''' Operating system 16.04 LTS
* '''OpenFOAM '''version 4.1
* '''ParaView ''' version 5.0

|-
| Slide 5 :

Pre-requisite
| To practice this tutorial, the user should have
* Basic knowledge of '''Linux terminal commands'''
* Experience with simulating cases in '''OpenFOAM'''
* Working skills in '''ParaView'''

If not, please go through the previous '''OpenFOAM''' spoken tutorials on this website: '''https://spoken-tutorial.org/'''
|-
| Slide 6 : Problem Statement-'''Variable Visualization'''
| '''Variable visualization'''
* '''OpenFOAM''' has provided an '''inbuilt case''' file for '''pitzDaily'''.

|-
| Slide 7 : Problem Statement-'''Variable Visualization'''
| Here we will:
* focus on '''post-processing''' of the '''pitzDaily''' solution
* learn to '''visualize flow field variables''' like '''velocity, pressure, vorticity,''' etc.
* learn to '''visualize velocity vector '''within the '''flow''' field

|-
| Slide
| You can find the '''pitzDaily case''' file within the '''simpleFoam''' directory within '''OpenFOAM-4.0>tutorials '''directory.


I have already copied this file in my work folder and run the simulation in my machine using '''simpleFoam'''.

|-
|Open a command Terminal.
|Now we will open this solved '''case''' file in the '''command terminal'''.

|-
|Type cd /opt/openfoam4/tutorials/incompressible/simpleFoam/pitzDaily
|Here I will type:
'''cd /opt/openfoam4/tutorials/incompressible/simpleFoam/pitzDaily'''

|-
|Type ls
|To see the content inside this folder type '''ls'''.


You will see all these files here.

|-
|Type paraFoam
|Now to '''post-process''' this '''simulation''', type '''paraFoam''', in the '''command terminal'''.


This will open the '''ParaView''' window.
|-
| ParaView Window >> click '''Apply'''
| To visualize the '''domain geometry''' click '''Apply''' button.

This is on the top left corner of the '''Properties''' panel.

|-
|Graphic window >> 
|This will show the '''domain geometry''' on the '''Graphic''' window.

|-
|Scroll down >> point to the different types of Volume fields
|Now scroll down within the '''Properties''' panel.


You will see the different types of '''Volume Fields''' available for '''visualization'''.


Here we will '''visualize''' the '''velocity field''' within the '''domain'''.

|-
|Check the '''U variable'''
|For this, check the '''U variable''' within the '''Volume Field'''.


Please note that the '''U variable''' is available to '''visualization''', by default.

|-
|Go to the toolbar.
|Now go to the toolbar.

|-
|Drop-down >>change '''vtkBlockColors''' to '''U''' 
|Change the '''vtkBlockColors''' to '''U''' from the drop-down options.


This will show the initial '''flow conditions''' on the '''Graphic''' window.

|-
|Menu bar >> click '''the lastFrame''' button.
|Now go to the '''Menu bar''' and click the '''lastFrame''' button.

|-
|'''Velocity field''' pattern
|You can see the '''velocity field''' pattern of the '''converged solution'''.


This will '''visualize''' the '''flow velocity field''' after 298 iterations.


Thus we have learnt to '''visualize field variables''' in '''ParaView'''.
|-
| Click on the '''Glyph filter''' >> point to the '''Pipeline''' window.
| After this we will learn to '''visualize velocity vectors'''.


To do this, click on the '''Glyph filter''' on the toolbar.


This will add a new component to the '''Pipeline''' window.

|-
|Scroll within the '''Glyph Properties''' panel.
|Now within the '''Glyph Properties''' panel make sure the 
* '''Glyph type''' is arrow
* '''Scale Mode''' is off
* '''Scaling Factor''' is 0.003


Keep the rest as default.

|-
|Click '''Apply''' button.
|Click '''Apply''' button on the top left corner of the '''Properties''' panel.


You will see small '''velocity vectors visualized''' within the '''domain'''.

|-
|Point to '''circulation zone''' and magnitude of '''velocity'''.
|You can now clearly see the '''circulation zone''' and magnitude of '''velocity'''.


Thus we have learned to create '''velocity vector''' in a '''flow''' field.

|-
|Close '''ParaView''' window
|After this close '''ParaView''' window.

Now let us go back to the next problem statement.

|-
| Slide 8 : '''Problem Statement-Streamlines Visualization'''
| '''Streamlines Visualization'''

'''OpenFOAM''' has provided an '''inbuilt case''' file for '''flow''' over a '''motorBike'''.

|-
| Slide 9 : '''Problem Statement-Streamlines Visualization'''
| Here we will:
* focus on '''post-processing''' of the '''motorBike''' solution
* learn to create '''stream lines''' and view them in '''ParaView'''

|-
| Terminal >> Visual Narration >>
| You can find the '''motorBike case''' file in the '''simpleFoam''' directory within '''OpenFOAM-4.1>tutorials '''directory.


I have already copied this file in my work folder. 

And run the '''simulation''' using '''simpleFoam'''.

|-
|Terminal

Type '''cd ..'''

Type '''cd motorBike'''

|Now open this solved '''case''' file in the '''command terminal'''.


Here I will type '''cd space dot dot'''

'''cd space motorBike'''

|-
|Type '''ls'''
|To see the content inside type '''ls'''


You will see all these files here.

|-
|Type '''paraFoam'''
|Now to '''post-process''' this '''simulation''', type '''paraFoam''' in the '''command terminal'''.


This will open the '''ParaView''' window.
|-
| ParaView Window >>click '''Apply''' in '''Properties''' panel.
| To visualize the '''domain geometry''', click '''Apply''' button on the top left corner of the '''Properties''' panel.

|-
|'''Menu bar''' >> click on '''lastFrame''' button 
|To include the last iteration, click on the '''lastFrame''' button on the '''Menu bar'''.

|-
|'''Tool Bar''' >> directional view >> '''+Y'''.
|Go to the '''Tool Bar''' and set the directional view to '''+Y'''.

|-
|In drop-down >> Change '''vtkBlockColors''' to U
|Change the '''vtkBlockColors''' to '''U''' from the drop-down options.

|-
|Scroll down '''Properties panel''' to '''Opacity'''
|Now scroll down on the '''Properties panel''' to '''Opacity'''.

|-
|Reduce the '''Opacity''' 
|Reduce the '''Opacity''' to make the domain transparent like this.


You will be able to see the motor bike with the rider through the domain now.

|-
|'''Tool Bar''' >> click on '''stream Tracer''' filter
|To create '''streamlines''' around the motor bike, click on '''stream Tracer''' filter on the '''Tool Bar'''.


This will add a new component within the '''Pipeline''' browser.

|-
|'''Properties''' panel >>'''Seeds section''' >> change '''Point''' to '''(5 0 1) '''


Change '''Number of Points''' to '''15'''


Change the '''Radius''' to '''1'''
|Here in the '''Properties''' panel change the '''Point''' to '''(5 0 1) '''coordinates within '''Seeds section'''.


This will change the location of the center of the '''stream lines'''.


Now change the '''Number of Points''' to '''15'''.


This show the number of '''stream lines''' you want to create.


Change the '''Radius''' to '''1'''.


This changes the radius of the '''stream line''' points.


Keep the rest of the values as default.

|-
|Click '''Apply'''
|After all changes have been made, click '''Apply''' on the '''Properties''' menu of the '''stream Tracer'''.


You can see '''stream lines''' around the motor bike along with their magnitude.


Thus we have learned to create '''stream lines''' in '''ParaView'''.

|-
|Close '''ParaView''' window.
|After this close the '''ParaView''' window.

|-
|
|We will go to the next problem statement.

|-
| Slide 10 : '''Problem Statement-Clip and Slice Filters'''
| '''Clip and Slice Filters'''
* '''OpenFOAM''' has provided an '''inbuilt case''' file for '''hotRadiationRoom'''

|-
| Slide 11 : '''Problem Statement-Clip and Slice Filters'''
| Here we will:
* focus on '''post-processing''' of the '''hotRadiationRoom''' solution
* '''learn to '''use filters like''' clip '''and '''slice '''in '''ParaView'''

|-
| Terminal >> Open case file as per narration
| 
*To open the '''hotRadiationRoom case''' file
*go to the '''hotRadiationRoom''' tutorial in '''BuoyantSimpleFoam '''within''' heatTransfer case''' directory. 

You can find this within '''OpenFOAM-4.1>tutorials '''directory.

|-
|
|I have already copied this file in my work folder and '''run''' the '''simulation''' using '''BuoyantSimpleFoam'''.


Now open this solved '''case''' file in the '''command terminal'''.

|-
|Type 
'''cd /opt/openfoam4/tutorials/heatTransfer/buoyantSimpleFoam/hotRadiationRoom'''
|Here I will type 
'''cd /opt/openfoam4/tutorials/heatTransfer/buoyantSimpleFoam/hotRadiationRoom'''

|-
|Type '''ls'''
|To see the content inside type '''ls'''.


You will see all these files here.

|-
|'''Terminal''' >> type '''paraFoam'''
|Now to '''post-process''' this '''simulation''', type '''paraFoam''', in the '''command terminal'''.


This will open the '''ParaView''' window.

|-
| ParaView Window >> click '''Apply''' button 
| To visualize the '''domain geometry''', click '''Apply''' button on the top left corner of the '''Properties''' panel.


This will show the '''domain geometry''' on the '''Graphic''' window.

|-
|Scroll inside '''Properties''' menu
|Now scroll down within the '''Properties''' menu.


You will see the different types of '''Volume Field''' available for visualization.

|-
|'''Volume Field''' >> check '''T variable''' >> click on '''Apply'''.
|Here we will visualize the '''Temperature field''' within the '''domain'''.


For this check the '''T variable''' within the '''Volume Field''' and click on '''Apply'''.

|-
|Toolbar drop-down >> change '''vtkBlockColors''' to '''T'''
|Now go to the toolbar.


Change the '''vtkBlockColors''' to '''T''' from the drop down options.


This will show the initial '''flow conditions''' on the '''Graphic '''window.

|-
|Toolbar >> set directional view to '''+Z'''.
|Go to the toolbar and set the directional view to '''+Z'''.

|-
|Menu bar >> click '''Play'''
|Now go to the '''Menu bar''' and click '''Play''' button.


You can see the temperature field pattern of the '''converged solution'''.


This will visualize the flow temperature field after 900 iterations.

|-
|Scroll '''Graphic''' window.
|Now click and scroll on the '''Graphic''' window. 

You can clearly see the temperature gradient due to radiation near the hot object.


But we are unable to visualize the whole section.


Thus we need to get a sectional or planar view of the field.
|-
| '''ParaView Window >> toolbar >> click on '''clip''' filter 
| First we will learn to create a sectional view of the field.


To do this, click on the '''clip''' filter on the toolbar.


This will add a new component to the '''Pipeline''' window.

|-
|'''Properties''' panel >> select '''Y Normal'''.
|Now in the '''Properties''' panel select '''Y Normal'''.

|-
|Scroll '''Graphic''' window >> shift '''reference''' section
|Scroll on the '''Graphic''' window like this. Then shift the '''reference''' section to the middle of the hot box.

|-
|'''Properties''' panel >> click '''Apply'''
|After this click '''Apply''' on the '''Properties''' panel.

|-
|Toolbar >> change view direction to '''+Y'''
|Now change the view direction to '''+Y''' on the toolbar.


Thus you can see the sectional view of the temperature field.

|-
|Delete this filter
|Now delete this filter to visualize the full domain from the '''Properties''' panel.

|-
| '''ParaView Window >>''' toolbar >> click on '''slice''' filter
| Now we will learn to create a planar view of the field.


To do this, click on the '''slice''' filter on the toolbar.


This will add a new component to the '''Pipeline''' window.

|-
|'''Properties''' panel >> select '''Y Normal'''.
|Now in the '''Properties''' panel select '''Y Normal'''.

|-
|Scroll '''Graphic''' window >> toolbar >> change view direction to '''+Z'''
|Scroll on the '''Graphic''' window like this. 


Now change the view direction to '''+Z''' on the toolbar.

|-
|'''Graphic''' window >> shift '''reference''' section
|Then shift the '''reference''' section to the middle of the hot box.

|-
|'''Properties''' panel >> click '''Apply'''
|After this click '''Apply''' on the '''Properties''' panel.

|-
|toolbar >> change view direction to '''+Y'''
|Now change the view direction to '''+Y''' on the toolbar.


Thus you can see a plane section view of the temperature field.
|-
|Close the '''ParaView''' window and switch to the slides
| Close the '''ParaView''' window.
|-
|Slide 12: Summary
|Let us summarize.


In this tutorial, we learnt some basic '''Post-Processing''' using '''ParaView'''.

Under this we have learnt to
*Visualize field variable
*Create '''Velocity Vectors'''
*Create '''Stream lines'''
*Use '''clip''' and '''slice''' filters

|-
| Slide 13: Exercise
|You can use the discussed utilities on other '''inbuilt case''' files.


This will help you understand the post-processing using ParaView better.
|-
| Slide 14:

Forum to answer questions
| Please post your timed queries in this forum.

|-
| Slide 15:

Forum to answer questions
| Please post your general queries on '''OpenFOAM''' in this forum.

|-
|Slide 16:

Case Study Project
| The '''FOSSEE ''' team coordinates the '''Case Study project'''.
|-
| Slide 17:

Lab Migration Project
| 
|-
| Slide 18:

Acknowledgement


https://spoken-tutorial.org
| The Spoken Tutorial Project is funded by NMEICT, MHRD, Govt. of India.


For more details, visit this website.
|-
|Thank You
| This is Deepa Vedartham from IIT Bombay signing off. Thanks for watching.
|-
|}